Commercial
Thermostats
DESCRIPTION
Thermostats can provide either temperature control or over-
temperature protection by breaking electrical contact when a
specified temperature is reached.
Honeywell manufactures a wide range of 12,7 mm [0.5 in]
commercial snap-action thermostats for possible use in a wide
array of small and major appliances, office copy machines,
medical equipment, heat detectors, HVAC equipment and
more.
These snap-action thermostats include automatic and manual
reset options, phenolic or ceramic housings and a wide variety
of mounting brackets and terminal options.
Each thermostat's design is configured from a base unit, and
may be customized for temperature tolerance and mechanical
configurations, meeting the customer’s needs for accuracy and
exactitude.
Honeywell can also integrate these thermostats in higher value
cable assemblies, incorporating wire harness and connectors.
TABLE OF CONTENTS
DESCRIPTION p. 1
NOMENCLATURE p. 2
DEFINITION OF TERMS
NOTES
p. 3
p. 3
COMMERCIAL THERMOSTATS
2450R/2450HR/2455R/2452R/2452HR Series Phenolic Automatic Reset p. 4
2450RC/2450RCH/2455RC Series Ceramic Automatic Reset p. 6
2455RM/2450CM Series Phenolic or Ceramic Manual Reset p. 9
2455RD Series Phenolic Manual Reset p. 11
2455RBV Series Overmolded Automatic Reset p. 13
2450A/2455RA Series Heat Detection p. 15
2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” p. 17
REDI-TEMP THERMOSTATS
3455RC Series
p. 19
MOUNTING HARDWARE
Brackets
Brass mounting studs
Terminals
p. 20
p. 21
p. 22
Commercial Thermostats
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NOMENCLATURE
The nomenclature given in Figure 1 is provided for reference only.
Figure 1. Commercial Thermostat Nomenclature
Honeywell Sensing and Control 3
DEFINITION OF TERMS
• Automatic Reset: A type of thermostat that will automatically reset at a specific temperature (i.e. a thermostat operates at
65,5 oC [150 oF] and resets at 48,89 oC [120 oF]).
• Bimetal: Two dissimilar metals bonded together to form the material for manufacturing thermally-sensitive discs which actuate
the thermostat.
• Close on Rise (COR): Refers to operation of the contacts. When the temperature rises to its set point, the contacts close or
make contact and complete the circuit.
• Contact Resistance: The value of resistance measured between the terminals.
• Dielectric Strength: The value of insulation between two electrically conducting parts. It may be tested by the application of a
predetermined overvoltage for a specified time.
• Differential: The temperature difference between the operate and reset set points, also known as operate and reset.
- Nominal: The temperature difference between nominal set points regardless of tolerance.
- Maximum: Maximum number of degrees between actual opening and closing set points.
- Minimum: Minimum number of degrees between actual opening and closing set points.
• Exposure Temperature: Thermal environment of a device during application operation.
• FLA (Full Load Amps): Current taken from the line by the motor when the motor is yielding the rated hp at the rated voltage
and frequency.
• Life Cycles: The endurance rating of the thermostat expressed in number of operations with stated electrical load applied.
Temperature limit application = open on rise.
• LRA (Locked Rotor Amps): The amount of current the motor can be expected to draw under starting conditions when full
voltage is applied, also known as starting inrush current.
• Manual Reset: A bimetal thermostat with a reset button that must be pressed to reset the contacts.
• Open on Rise (OOR): Refers to the operation of contacts. When the temperature rises to its set point the contacts open,
terminating the circuit.
• Overmold: Encapsulation with an insulating material.
• Phenolic: Thermoset plastic used for the insulating body of the thermostat.
• Set Point: The nominal temperature at which the thermostat operates.
• SPST (Single Pole/Single Throw): A switch with one current path which can be either open or closed.
• Tolerance: The allowable range above and below the set point temperature.
• Operate: Change of state when the thermostat reaches its set point.
• Reset: Change of state when the thermostat returns to its original condition prior to operation.
NOTES
• Standard Temperature Characteristics Tables:
- Temperatures: Please consult applications engineering for temperature ranges, tolerances and differentials not noted.
The operating temperature ranges include tolerances.
- Tolerances: The ± tolerances given have been established after review of many thermostat applications. Attempts should
be made to establish the widest acceptable tolerance possible.
• UL and CSA Approvals: 12,7 mm [0.5 in] thermostats are available with multiple agency approval for incorporation into
equipment.
• Fan control applications: Require thermostat set points to be derated by 20 °C from the equivalent temperature limit
application. They also close on rise.
• Dimensions: Are for reference only and are given in mm [in].
Commercial Thermostats
4 www.honeywell.com/sensing
Figure 2. 2450R/2450HR/2455R/2452R/2452HR Series Phenolic Automatic Reset Thermostat
The 2450R/2450HR/2455R/2452R/2452HR Series is a
single pole, single throw, snap-acting, non-adjustable
thermostat which may be used in applications such as
power supplies, general appliances and medical equipment.
A temperature-sensitive bimetal disc, electrically and
thermally isolated from the switch, is used to actuate the
normally-closed contacts. Contacts open when surface or
ambient temperatures increase to the operating set point of
the calibrated bimetal disc. The entire switch is enclosed in
a phenolic housing; the bimetal disc is retained by a metal
heat-conducting end cap. Due to the small size of this unit
and the inherently low mass of the bimetal snap-action disc,
response of this thermostat to temperature changes is
extremely rapid, compared to other commercially available
thermostatic devices. A variety of mounting brackets and
terminals are available.
All versions are UL/CSA approved.
The 2452R/2452HR/2455R version meets the requirements of
EN60730-01.
Potential applications include:
• Power supplies
• Appliances
• Medical equipment
• Water heaters
• Office automation
• Industrial equipment
• HVAC equipment
Table 1. 2450R/2450HR/2455R/2452R/2452HR Series Standard Temperature Characteristics
Tolerance Operating Temperature Range
Open
°C [°F]
Close
°C [°F]
Standard Mean Differential
°C [°F]
±4 [±7] ±6 [±10] 28 to 34 [50 to 60]
±4 [±6] ±6 [±10] 22 to 27 [40 to 49]
±4 [±6] ±5 [±9] 17 to 22 [30 to 39]
±4 [±6] ±5 [±8] 14 to 16 [25 to 29]
0 °C to 26 °C
[32 °F to 79 °F]
±3 [±5] ±5 [±8] 8 to 14 [15 to 24]
±5 [±9] ±8 [±15] 45 to 56 [81 to 100]
±4 [±7] ±6 [±11] 34 to 45 [61 to 80]
±4 [±6] ±6 [±10] 28 to 34 [50 to 60]
±3 [±5] ±6 [±10] 22 to 27 [40 to 49]
±3 [±5] ±5 [±9] 17 to 22 [30 to 39]
27 °C to 82 °C
[80 °F to 180 °F]
±3 [±5] ±5 [±8] 8 to 16 [15 to 29]
±6 [±10] ±8 [±15] 45 to 56 [81 to 100]
±5 [±8] ±8 [±15] 34 to 45 [61 to 80]
±4 [±7] ±7 [±12] 28 to 34 [50 to 60]
±4 [±6] ±6 [±10] 22 to 27 [40 to 49]
±4 [±6] ±5 [±9] 17 to 22 [30 to 39]
83 °C to 110 °C
[181 °F to 230 °F]
±4 [±6] ±5 [±8] 8 to 16 [15 to 29]
±7 [±12] ±10 [±18] 45 to 56 [80 to 100]
±5 [±9] ±8 [±15] 34 to 45 [61 to 80]
±5 [±8] ±7 [±12] 28 to 34 [50 to 60]
±4 [±7] ±7 [±12] 22 to 27 [40 to 49]
±4 [±7] ±6 [±11] 17 to 22 [30 to 39]
111 °C to 150 °C
[231 °F to 302 °F]
±4 [±7] ±6 [±10] 14 to 16 [25 to 29]
Honeywell Sensing and Control 5
Table 2. 2450R/2450HR/2455R/2452R/2452HR Series Specifications
Characteristic Parameter
Switch type SPST
Reset type automatic
Amperage See Tables 3, 4
Voltage 120 Vac to 250 Vac
Operating temperature range 0 °C to 150 °C [32 °F to 302 °F]
Environmental exposure range -18 °C to 177 °C [0 °F to 350 °F]
Materials:
Base
Contacts
Terminals
Closure
Brackets
phenolic
silver alloy
unplated brass, plated brass or steel
aluminum, brass or stainless steel
aluminum or stainless steel
UL and CSA approvals • 2455R: 6,35 mm [0.25 in] clearance; UL File MH8267, UL File E36103; CSA File LR21048
• 2450HR: 1,59 mm [0.0625 in] clearance; UL File E36103; CSA File LR21048
• 2450R: 1,59 mm [0.0625 in] clearance; UL File E36103; CSA File LR 21048
• 2452R: 2.66mm [0.105 in] clearance; UL E36103
• 2452HR: 2.66mm [0.105 in] clearance; UL36103
Weight 6 g [0.2 oz] (does not include brackets or wire leads)
Table 3. 2450R/2450HR/2452R/2452HR Contact Ratings
Life Cycles 120 Vac 240 Vac 277 Vac
100,000 15 A resistive 10 A resistive 10 A resistive
30,000 125 VA pilot duty 125 VA pilot duty -
Note: 2450 approval rating is limited by EN60730-1 to 125 Vac max.
Table 4. 2455R Contact Ratings
Life Cycles 120 Vac 240 Vac 277 Vac
100,000 15 A resistive
4.4 FLA 26.4 LRA
125 VA pilot duty
10 A resistive
2.2 FLA 13.2 LRA
125 VA pilot duty
7.2 A resistive
6,000 5.8 FLA, 34.8 LRA 2.9 FLA, 17.4 LRA -
Note: Additional contact ratings are available, please contact Honeywell.
Figure 3. 2450R/2450HR/2455R/2452R/2452HR Basic Dimensions
2450R
2450HR
2455R
2452R
2452HR
Commercial Thermostats
6 www.honeywell.com/sensing
Figure 4. 2450RC/2450RCH/2455RC Series Automatic Reset Thermostat
The 2450RC/2450RCH/2455RC Series is a single pole,
single throw, snap-acting, non-adjustable thermostat which
may be used in applications such as industrial and electrical
equipment. A temperature-sensitive bimetal disc, electrically
and thermally isolated from the switch, is used to actuate
the normally-closed contacts. Contacts open when surface
or ambient temperatures increase to the operating set point
of the calibrated metal disc. The entire switch is enclosed in
a ceramic housing; the bimetal disc is retained by a metal
heat-conducting end cap. Due to the small size of this unit
and the inherently low mass of the bimetal snap-action disc,
response of this thermostat to temperature changes is
extremely rapid, compared to other commercially available
thermostatic devices. For increased sensitivity, an exposed
bimetal disc may be specified. A variety of mounting
brackets and terminals is available.
All versions are UL/CSA and European approved.
Potential applications include high temperature control for:
• Power supplies
• Appliances
• Medical equipment
• Water heaters
• Office automation
• Industrial equipment
• HVAC equipment
Table 5. 2450RC/2450RCH/2455RC Series Standard Temperature Characteristics
Tolerance Operating Temperature Range
Open
°C [°F]
Close
°C [°F]
Standard Mean Differential
°C [°F]
±4 [±7] ±6 [±10] 28 to 34 [50 to 60]
±4 [±6] ±6 [±10] 22 to 27 [40 to 49]
±4 [±6] ±5 [±9] 17 to 22 [30 to 39]
±4 [±6] ±5 [±8] 14 to 16 [25 to 29]
0 °C to 26 °C
[32 °F to 79 °F]
±3 [±5] ±5 [±8] 8 to 14 [15 to 24]
±5 [±9] ±8 [±15] 45 to 56 [81 to 100]
±4 [±7] ±6 [±11] 34 to 45 [61 to 80]
±4 [±6] ±6 [±10] 28 to 34 [50 to 60]
±3 [±5] ±6 [±10] 22 to 27 [40 to 49]
±3 [±5] ±5 [±9] 17 to 22 [30 to 39]
27 °C to 82 °C
[80 °F to 180 °F]
±3 [±5] ±5 [±8] 8 to 16 [15 to 29]
±6 [±10] ±8 [±15] 45 to 56 [81 to 100]
±5 [±8] ±8 [±15] 35 to 45 [61 to 80]
±4 [±7] ±7 [±12] 28 to 34 [50 to 60]
±4 [±6] ±6 [±10] 22 to 27 [40 to 49]
±4 [±6] ±5 [±9] 17 to 22 [30 to 39]
83 °C to 110 °C
[181 °F to 230 °F]
±4 [±6] ±5 [±8] 8 to 16 [15 to 29]
Honeywell Sensing and Control 7
Table 6. 2450RC/2450RCH/2455RC Series Standard Temperature Characteristics (continued)
Tolerance Operating Temperature Range
Open
°C [°F]
Close
°C [°F]
Standard Mean Differential
°C [°F]
±7 [±12] ±10 [±18] 45 to 56 [81 to 100]
±5 [±9] ±8 [±15] 34 to 45 [61 to 80]
±5 [±8] ±7 [±12] 28 to 34 [50 to 60]
±4 [±7] ±7 [±12] 22 to 27 [40 to 49]
±4 [±7] ±6 [±11] 17 to 22 [30 to 39]
111 °C to 149 °C
[231 °F to 300 °F]
±4 [±7] ±6 [±10] 14 to 16 [25 to 29]
±8 [±15] ±11 [±20] 39 to 45 [71 to 80]
±6 [±10] ±11 [±20] 34 to 39 [61 to 70]
±6 [±10] ±8 [±15] 28 to 33 [50 to 60]
150 °C to 170 °C
[301 °F to 335 °F]
±6 [±10] ±7 [±12] 22 to 27 [40 to 49]
±14 [±25] ±14 [±25] 51 to 56 [91 to 100]
±11 [±20] ±11 [±20] 39 to 50 [71 to 90]
171 °C to 220 °C
[336 °F to 425 °F] ±8 [±15] ±11 [±20] 28 to 39 [50 to 70]
±14 [±25] ±14 [±25] 51 to 56 [91 to 100]
±11 [±20] ±11 [±20] 39 to 50 [71 to 90]
221 °C to 235 °C
[426 °F to 450 °F] ±8 [±15] ±11 [±20] 28 to 39 [50 to 70]
±14 [±25] ±14 [±25] 31 to 56 [60 to 100] 236 °C to 260 °C
[451 °F to 500 °F] ±11 [±20] ±11 [±20] 28 to 50 [50 to 90]
Table 7. 2450RC/2450RCH/2455RC Series Specifications
Characteristic Parameter
Switch type SPST
Reset type automatic
Amperage See Tables 8, 9
Voltage 120 Vac to 250 Vac
Operating temperature range 0 °C to 260 °C [32 °F to 500 °F]
Environmental exposure range -20 °C to 287 °C [0 °F to 550 °F]
Materials:
Base
Contacts
Terminals
Closure
Brackets
ceramic
silver alloy
plated steel
aluminum, brass, or stainless steel
stainless steel
Approvals • 2450RCH: 1,59 mm [0.0625 in] clearance through air and over surface; UL File E36103;
CSA File LR21048
• 2450RC: 1,59 mm [0.0625 in] clearance; UL file E36103; CSA File LR21048
• 2455RC: 6,35 mm [0.25 in] clearance; UL File E36103; CSA File LR21048
Weight 6 g [0.21 oz] (does not include brackets or wire leads)
Commercial Thermostats
8 www.honeywell.com/sensing
Table 8. 2450RCH/2450RC Contact Ratings
Life Cycles 120 Vac 240 Vac
100,000 15 A resistive 10 A resistive
30,000 125 VA pilot duty 125 VA pilot duty
Table 9. 2455RC Contact Ratings
Life Cycles 120 Vac 240 Vac
100,000 15 A resistive 10 A resistive
100,000 4.4 FLA 26.4 LRA 2.2 FLA 13.2 LRA
100,000 125 VA pilot duty 125 VA pilot duty
Note: Additional contact ratings are available, please contact Honeywell.
Figure 5. 2450RC/2450RCH/2455RC Basic Dimensions
2450RC
2450RCH
2455RC
Honeywell Sensing and Control 9
Figure 6. 2455RM/2450CM Series Phenolic or Ceramic Manual Reset Thermostats
The 2455RM (phenolic)/2450CM (ceramic) Series is a
single pole, single throw, snap-acting, non-adjustable
thermostat. A temperature-sensitive bimetal disc, electrically
and thermally isolated from the switch, is used to actuate
the normally-closed contacts. Contacts open when surface
or ambient temperatures increase to the operating set point
of the calibrated bimetal disc. The entire switch is enclosed
in a housing; the bimetal disc is retained by a metal heat-
conducting end cap. The circuit remains open above the
room ambient temperature until the manual reset button is
depressed. Due to the small size of this unit and the
inherently low mass of the bimetal snap-action disc,
response of this thermostat to temperature changes is
extremely rapid, compared to other commercially available
thermostatic devices. For increased sensitivity, an exposed
bimetal disc may be specified. A variety of mounting
brackets and terminals is available.
All versions are UL/CSA, European approved.
Potential applications include those where a manual reset is
desired, including:
• Power supplies
• Appliances
• Medical equipment
• Water heaters
• Office automation
• Industrial equipment
• HVAC equipment
Table 10. 2455RM Series Standard Temperature Characteristics
Operating Temperature Range Tolerance °C [°F]
52 °C to 93 °C [125 °F to 200 °F] ±5 [±8]
94 °C to 121 °C [201 °F to 250 °F] ±6 [±10]
122 °C to 150 °C [251 °F to 302 °F] ±7 [±12]
Table 11. 2450CM Series Standard Temperature Characteristics
Operating Temperature Range Tolerance °C [°F]
52 °C to 93 °C [125 °F to 200 °F] ±5 [±8]
94 °C to 121 °C [201 °F to 250 °F] ±6 [±10]
122 °C to 149 °C [251 °F to 300 °F] ±7 [±12]
150 °C to 177 °C [301 °F to 350 °F] ±8 [±15]
177 °C to 204 °C [351 °F to 400 °F] ±10 [±18]
205 °C to 232 °C [401 °F to 450 °F] ±11 [±20]
Commercial Thermostats
10 www.honeywell.com/sensing
Table 12. 2455RM/2450CM Series Specifications
Characteristic Parameter
Switch type SPST
Reset type manual
Amperage 15 A resistive at 6,000 cycles (UL); 16 A resistive at 1000 cycles (EU)
Voltage 120 Vac to 250 Vac
Operating temperature range 2455RM: 52 °C to 150 °C [125 °F to 302 °F]
2450CM: 52 °C to 232 °C [125 °F to 450 °F]
Environmental exposure range 2455RM: -20 °C to 177 °C [0 °F to 350 °F]
2450CM: -20 °C to 260 °C [0 °F to 500 °F]
Materials:
Base
Contacts
Terminals
Closure
Brackets
2455RM: phenolic; 2450CM: ceramic
silver alloy
2455RM: unplated brass, plated brass or steel; 2450CM: plated steel
aluminum, brass, or stainless steel
stainless steel
Approvals UL File E36103, CSA File LR21048
Weight 6 g [0.21 oz] (does not include brackets or wire leads)
NOTICE
• 2455RM/2450CM thermostats are intended as a manual reset control. They are not to be used on applications where a limit
thermostat is required unless back-up protection is provided. Units have been tested by UL for 1,000 cycles under load,
5,000 cycles no load, and are not considered as limit devices.
• This range of thermostats has an automatic reset function with manual override function.
• Reset pin operation should not be performed above 70% of set point temperature.
Table 13. 2450CM/2455RM Contact Ratings
Life Cycles 120 Vac 240 Vac
6,000 15 A resistive 10 A resistive
6,000 4.4 FLA 26.4 LRA
125 VA pilot duty
2.2 FLA 13.2 LRA
125 VA pilot duty
Note: Additional contact ratings are available, please consult Honeywell.
Figure 7. 2455RM/2455CM Basic Dimensions
2455RM
2450CM
A Maximum travel of reset button on contact opening
B On contact closing
C Reset button
Honeywell Sensing and Control 11
Figure 8. 2455RD Series Phenolic Manual Reset
The 2455RD Series is a single pole, single throw, snap-
acting, non-adjustable thermostat. A temperature-sensitive
bimetal disc, electrically and thermally isolated from the
switch, is used to actuate the normally-closed contacts.
Contacts open when surface or ambient temperatures
increase to the operating set point of the calibrated bimetal
disc. The entire switch is enclosed in a housing; the bimetal
disc is retained by a metal heat-conducting end cap. The
circuit remains open above the room ambient temperature
until the manual reset button is depressed. (These devices
are constructed with an additional steel disc so that they are
manual reset only. They do not have an automatic reset.)
Due to the small size of this unit and the inherently low
mass of the bimetal snap-action disc, response of this
thermostat to temperature changes is extremely rapid,
compared to other commercially available thermostatic
devices. For increased sensitivity, an exposed bimetal disc
may be specified. A variety of mounting brackets and
terminals is available.
All versions are UL/CSA and European approved.
Potential applications include those where a manual reset is
desired, including:
• Power supplies
• Appliances
• Medical equipment
• Water heaters
• Office automation
• Industrial equipment
• HVAC equipment
Table 14. 2455RD Series Standard Temperature Characteristics
Operating Temperature Range Tolerance °C [°F]
52 °C to 93 °C [125 °F to 200 °F] ±5 [±8]
94 °C to 121 °C [201 °F to 250 °F] ±6 [±10]
122 °C to 150 °C [251 °F to 302 °F] ±7 [±12]
Commercial Thermostats
12 www.honeywell.com/sensing
Table 15. 2455RD Series Specifications
Characteristic Parameter
Switch type SPST
Reset type manual
Amperage 15 A resistive at 6,000 cycles (UL); 16 A resistive at 1000 cycles (EU)
Voltage 120 Vac to 250 Vac
Operating temperature range 2455RD: 52 °C to 150 °C [125 °F to 302 °F]
Environmental exposure range 2455RD: -20 °C to 177 °C [0 °F to 350 °F]
Materials:
Base
Contacts
Terminals
Closure
Brackets
phenolic
silver alloy
unplated brass, plated brass or steel
aluminum, brass, or stainless steel
stainless steel
Approvals UL File E36103, CSA File LR21048
Table 16. 2455RD Contact Ratings
Life Cycles 120 Vac 240 Vac
6000 15 A resistive 10 A resistive
Note: Additional contact ratings are available, please consult Honeywell.
Figure 9. 2455RD Basic Dimensions
A Maximum travel of reset button on contact opening
B On contact closing
C Reset button
Honeywell Sensing and Control 13
Figure 10. Series 2455RBV Overmolded Automatic Reset Thermostats
The 2455RBV Series has a temperature-sensitive bimetal
disc, electrically and thermally isolated from the switch that
is used to actuate the normally closed contacts. The
contacts open when surface or ambient temperatures
increase to the operating set point of the calibrated bimetal
disc. The entire switch is enclosed in a phenolic or ceramic
housing; the bimetal disc is retained by a metal heat-
conducting end cap. The unit is then encapsulated in epoxy.
This series is UL/CSA and European approved.
Potential applications include:
• Automotive
• Industrial equipment
• HVAC
Table 17. 2455RBV Series Standard Temperature Characteristics
Tolerance Operating Temperature Range
Open
°C [°F]
Close
°C [°F]
Standard Mean Differential
°C [°F]
±4 [±7] ±6 [±10] 17 to 44 [30 to 80]
±3 [±6] ±4 [±8] 14 to 28 [25 to 50]
-12,2 °C to 26,7 °C
[10 °F to 80 °F] ±3 [±5] ±4 [±8] 11 to 22 [20 to 40]
±3 [±6] ±6 [±10] 17 to 44 [30 to 80] 27,2 °C to 105 °C
[81 °F to 221 °F] ±3 [±5] ±4 [±8] 11 to 28 [20 to 50]
Commercial Thermostats
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Table 18. 2455RBV Series Specifications
Characteristic Parameter
Switch type SPST
Reset type automatic
Amperage see Table 19
Voltage 120 Vac to 250 Vac
Operating temperature range 0 °C to 105 °C [32 °F to 221 °F]
Environmental exposure range -18 °C to 126.6 °C [0 °F to 260 °F]
Materials:
Boot
Base
Contacts
Terminals
Closure
Brackets
nylon, with epoxy filled or injection molded
internal 2455RC ceramic or 2455R phenolic
silver alloy
plated steel with wires
aluminum, brass, or stainless steel
stainless steel
Approvals UL File SA4469, CSA File LR21048.
Weight 6.5 g [0.23 oz] (does not include brackets or wire leads)
Table 19. 2455RBV Series Contact Ratings
Life Cycles 120 Vac 240 Vac
100,000 15 A resistive 10 A resistive
6,000 5.8 FLA 34.8 LRA 2.9 FLA 17.4 LRA
100,000 4.4 FLA 26.4 LRA
125 VA pilot duty
2.2 FLA 13.2 LRA
125 VA pilot duty
Note: Additional contact ratings are available, please contact Honeywell.
Figure 11. 2455RBV Basic Dimensions
17,27 DIA.
[0.680] 0,020
[0.51]
18,54
[0.730]
B
B
A
A Specify wire gauge and insulation
B Specify dimension
Honeywell Sensing and Control 15
Figure 12. 2450A/2455RA Heat Detection Thermostats
The 2450A/2455RA Series is a single pole, single throw,
snap-acting, non-adjustable thermostat designed for easy
mounting in devices such as fire alarms, security devices
and smoke detectors. A temperature-sensitive bimetal disc,
electrically and thermally isolated from the switch, is used to
actuate the normally-closed contacts. Contacts open when
surface or ambient temperatures increase to the operating
set point of the calibrated bimetal disc. Devices are UL
recognized and designed for use in both photoelectric and
ionization type smoke detectors. Thermostats are available
with and without collectors and meet UL spacing
requirements for 15 ft, 30 ft and 50 ft. They are available to
open or close on a temperature rise of 47 °C [117 °F] to
107 °C [225 °F]. Devices feature gold contacts for low
voltage requirements and are epoxy sealed at the cap and
terminal for long storage life of the application. Collectors
are available in silver, black, beige, gold or bronze finishes.
All versions are UL approved.
Potential applications:
• Smoke alarm/heat detectors in industrial, residential and
commercial
NOTICE
Final approval of a fire detection system is determined by UL as outlined in UL #521 and UL #217 for the suitability of the
combination of the thermostat (2450A/2455RA) and the user’s mounting base, together with its intended application of the total
fire detection system. To assist the use with design and testing , a minimum of 0.25 in extension beyond the housing is
recommended.
Table 20. 2450A/2455RA Series Standard Temperature Characteristics
Detection (Close on Rise) Release (Open on Rise)
Close
°C [°F]
Open
°C [°F]
Open
°C [°F]
Close
°C [°F]
47 ±3 [117±5] 30 min [85 min] 57 ±3 [117 ±5] 30 min [85 min]
57 ±3 [135 ±5] 32 min [90 min] 57 ±3 [135 ±5] 32 min [90 min]
69 ±3 [156 ±5] 32 min [90 min] 69 ±3 [156 ±5] 32 min [90 min]
85 ±4 [185 ±7] 32 min [90 min] 85 ±4 [185 ±7] 32 min [90 min]
107 ±4 [225 ±7] 32 min [90 min] 107 ±4 [225 ±7} 32 min [90 min]
Notes:
• Additional switches can be provided as long as they fall between 47,2 °C to 107,2 °C [117 °F to 225 °F] close on rise or open or
rise.
• Please consult Honeywell for tolerances and temperatures not listed.
Commercial Thermostats
16 www.honeywell.com/sensing
Table 21. 2450A/2455RA Series Specifications
Characteristic Parameter
Switch type SPST
Reset type automatic
Amperage 3 A
Voltage 120 Vac
Operating temperature range 47,2 °C to 107,2 °C [117 °F to 225 °F]
Environmental exposure range -0 °C to 150 °C [32 °F to 302 °F]
Materials:
Base
Contacts
Terminals
Closure
Brackets
phenolic
gold flash
unplated brass, plated brass
aluminum
aluminum
Approvals UL File S1015 and S1389; Guide USCV2 and TAOZ2, UL Standard #521, #217
Weight 6 g [0.21 oz] (does not include brackets)
Figure 13. 2450A/2455RA Basic Dimensions
2450A
2455RA
Figure 14. 2450A/2455RA Collector Figure 15. 2450A and 2455RA Spacing
B247
2450A: 4,6 m [15 ft]
2455RA with B247A: 15,2 m [50 ft]
Honeywell Sensing and Control 17
Figure 16. 2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” Thermostats
The 2450R/2455R/2450RC/2455RC/2450HR/2450RCH
Series “One Shot” is a single pole, single throw, snap-
acting, non-adjustable thermostat designed as a high limit
device for applications where automatically resettable
thermostats are not desirable. A temperature-sensitive
bimetal disc, electrically and thermally isolated from the
switch, is used to actuate the normally-closed contacts.
Contacts open when surface or ambient temperatures
increase to the operating set point of the calibrated bimetal
disc. The entire switch is enclosed in a housing; the bimetal
disc is retained by a metal heat-conducting end cap. The
circuit remains open above the room ambient temperature
and will reset below -35 °C [-31 °F]. For increased
sensitivity, an exposed disc may be specified. A variety of
mounting brackets and terminals is available.
All versions are UL/CSA approved and European approved.
Potential applications include:
• Power supplies
• Appliances
• Medical equipment
• Water heaters
• Office automation
• Industrial equipment
• HVAC equipment
Table 22. 2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” Standard Temperature Characteristics
Operating Temperature Range Tolerance °C [°F]
52 °C to 93 °C [125 °F to 200 °F] 5 [8]
94 °C to 121 °C [201 °F to 250°F] 6 [10]
122 °C to 149 °C [251 °F to 300 °F] 7 [12]
150 °C to 177 °C [301 °F to 350 °F] 8 [15]
177 °C to 204 °C [351 °F to 400 °F] 10 [18]
205 °C to 232 °C [401 °F to 450 °F] 11 [20]
232 °C to 260 °C [451 °F to 500 °F] 14 [25]
Commercial Thermostats
18 www.honeywell.com/sensing
Table 23. 2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” Specifications
Characteristic Parameter
Switch type SPST
Reset type One Shot
Amperage see Table 24
Voltage 120 Vac to 250 Vac
Operating temperature range 2450R/2455R/2450HR/2450RCH: 52 °C to 150 °C [125 °F to 302 °F]
2450RC/2455RC: 52 °C to 260 °C [125 °F to 500 °F]
Environmental exposure range 2450R/2455R/2450HR/2450RCH: 17.8 °C to 177 °C [0 °F to 350 °F]
2450RC/2455RC: 17.8 °C to 287 °C [125 °F to 550 °F]
Materials:
Base
Contacts
Terminals
Closure
Brackets
phenolic or ceramic
silver alloy
unplated brass, plated brass or steel
aluminum, brass, stainless steel
stainless steel
Approvals UL File E36103, CSA File LR43279
Weight 6 g [0.21 oz] (does not include brackets or lead wires)
Table 24. 2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” Contact Ratings
Cycles 120 Vac 240 Vac 277 Vac
1 15 A resistive 10 A resistive 10 A resistive
Notes:
• Resets below -35 °C [-31 °F].
• Additional contact ratings are available. Please consult Honeywell.
Figure 17. 2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” Basic Dimension
2450R/22450RC “One Shot”
2455R/2455RC “One Shot”
2450HR “One Shot”
2450RCH “One Shot”
Honeywell Sensing and Control 19
REDI-TEMP THERMOSTATS
REDI-TEMP thermostats are pre-configured as shown and are readily available.
Figure 18. 3455RC REDI-TEMP Series (See page 6 for specifications and potential applications.)
3455RC B203S Moveable Bracket
32,26
[1.270]
17,55
[0.691]
23,80
[0.937]
2X 3,56 DIA
[0.140]
31,19
[1.228]
0.51
[0.20]
11,9
[0.469]
2X 1,7 DIA
[0.067]
Table 25. 3455RC REDI-TEMP Series Open on Rise Table 26. 3455RC REDI-TEMP Series Close on Rise
Catalog
Listing
Open
Temp.
°C [°F]
Open
Tolerance
°C [°F]
Close
Temp.
°C [°F]
Close
Tolerance
°C [°F]
Catalog
Listing
Close
Temp.
°C [°F]
Close
Tolerance
°C [°F]
Open
Temp.
°C [°F]
Open
Tolerance
°C [°F]
3455RC-100-220 18 [65] ±3 [±5] -1 [30] ±5 [±8] 3455RC-100-243 21 [70] ±5 [±8] 2 [35] ±3 [±5]
3455RC-100-221 24 [75] ±3 [±5] 4 [40] ±5 [±8] 3455RC-100-244 32 [90] ±5 [±8] 16 [60] ±3 [±5]
3455RC-100-222 29 [85] ±3 [±5] 13 [55] ±5 [±8] 3455RC-100-245 43 [110] ±5 [±8] 27 [80] ±3 [±5]
3455RC-100-223 35 [95] ±3 [±5] 18 [65] ±5 [±8] 3455RC-100-246 54 [130] ±5 [±8] 38 [100] ±3 [±5]
3455RC-100-224 41 [105] ±3 [±5] 24 [75] ±5 [±8] 3455RC-100-247 66 [150] ±5 [±8] 49 [120] ±3 [±5]
3455RC-100-225 46 [115] ±3 [±5] 29 [85] ±5 [±8] 3455RC-100-248 77 [170] ±5 [±8] 60 [140] ±3 [±5]
3455RC-100-226 52 [125] ±3 [±5] 35 [95] ±5 [±8] 3455RC-100-249 88 [190] ±5 [±8] 71 [160] ±3 [±5]
3455RC-100-227 57 [135] ±3 [±5] 41 [105] ±5 [±8] 3455RC-100-250 99 [210] ±5 [±8] 82 [180] ±4 [±6]
3455RC-100-228 63 [145] ±3 [±5] 46 [115] ±5 [±8] 3455RC-100-251 110 [230] ±5 [±8] 93 [200] ±4 [±6]
3455RC-100-229 68 [155] ±3 [±5] 52 [125] ±5 [±8]
3455RC-100-230 73 [165] ±3 [±5] 57 [135] ±5 [±8]
3455RC-100-231 79 [175] ±3 [±5] 63 [145] ±5 [±8]
3455RC-100-232 85 [185] ±3 [±5] 68 [155] ±5 [±8]
3455RC-100-233 91 [195] ±3 [±5] 73 [165] ±5 [±8]
3455RC-100-234 96 [205] ±4 [±6] 79 [175] ±5 [±8]
3455RC-100-235 102 [215] ±4 [±6] 85 [185] ±5 [±8]
3455RC-100-236 107 [225] ±4 [±6] 91 [195] ±5 [±8]
3455RC-100-237 113 [235] ±4 [±6] 96 [205] ±5 [±8]
3455RC-100-238 118 [245] ±4 [±6] 102 [215] ±5 [±8]
3455RC-100-239 124 [255] ±4 [±7] 107 [225] ±5 [±8]
3455RC-100-240 135 [275] ±4 [±7] 118 [245] ±5 [±8]
3455RC-100-241 146 [295] ±4 [±7] 129 [265] ±5 [±8]
3455RC-100-242 157 [315] ±6 [±10] 135 [275] ±8 [±15]
Note: Materials and contact ratings are the same as those for 2455RC.
Commercial Thermostats
20 www.honeywell.com/sensing
MOUNTING HARDWARE
Figure 19. Brackets
B-205, B-205A
Air Stream
B-201, B-201A, B-201B
Stationary Surface
B-203, B-203A, B-203B
Movable Surface
A Enclosed B Exposed
B-203S
B-206
B-207
43,05
[1.695] 34,11
[1.343]
25.40 DIA
[1.000]
3,96
[0.156]
B-209
B-210
12,70
[0.500]
8,71 R
[0.343]
11,10
[0.437] 2X 3,73 DIA
[0.147]
3,18
[0.125]
B-212, B-212A
B-213
B-230
B-239
Honeywell Sensing and Control 21
Figure 19. Brackets (Continued)
B-246
B-249
B-250
B-264
Figure 20. Brass Mounting Studs
B-220: 6-32
B-221: 8-32
B-222: 10-24
B-223: 10-32
B-224: M3X0.5
B-225: M4X0.7
B-226: M5X0.8
B-227: M6X1.0
B240
6-32
8-32
10-32
M3X0.5
M4X0.7
M5X0.8
A Undercut to minor diameter B Specify length C Specify thread
B-327
B-901
4,1
[0.062] 5,0
[0.17]
M4 X 0.7
B-902
Commercial Thermostats
22 www.honeywell.com/sensing
Figure 21. Terminals
T-101
Horizontal Solder
T-103
Special
T-106
Vertical Solder Inside
T-107
Vertical Solder Outside
T-120
Special
34,93
[1.375]
25,40
[1.000]
4,90 DIA
[0.193]
1,32 [0.052]
3,86 [0.152]
4.57 [0.180]
6.10 [0.240]
T-141
Horizontal Weld
T-146
1/4 in Quick Connect, Horizontal
T-147
1/4 in Quick Connect, Vertical
15,85
[0.624]
8,64
[0.340]
1
,70 DIA
[0.067]
T-148
1/4 in Quick Connect, 45°
1,70 DIA
[0.067]
27,59
[1.086]
6,16
[0.242]
45°
T-149
3/16 in Quick Connect, Flat
terminal thickness = 0.5 mm [0.020 in]
T-150
3/16 in Quick Connect. Vertical
terminal thickness = 0.5 mm [0.020 in]
T-151
3/16 in Quick Connect, 45°
T-161
T-162
T-164
T-165
T-168
T-169
T-170
T-178
62,18
[2.448]
2,79
[0.110]
12,70
[0.500]
1,27
[0.050]
3,18
[0.125]
Honeywell Sensing and Control 23
Figure 21. Terminals (Continued)
T-179
T-188
12,90
[0.508] 2,54
[0.100]
T-806
Vertical Weld Inside
T-807
Vertical Weld Outside
T-846
Horizontal 32,5
[1.28]
A
A = 2X threaded for M3 screw
T-849
3/16 in Quick Connect, Flat
terminal thickness = 0.8 mm [0.032 in]
T-850
3/16 in Quick Connect, Vertical
terminal thickness = 0.8 mm [0.032 in]
T-899
8,7
[0.34]4,9
[0.19]
Sensing and Control
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422
www.honeywell.com
009053-2-EN IL50 GLO Printed in USA
September 2009
Copyright © 2009 Honeywell International Inc. All rights reserved.
WARNING
PERSONAL INJURY
DO NOT USE these products as safety or emergency stop
devices or in any other application where failure of the
product could result in personal injury.
Failure to comply with these instructions could result in
death or serious injury.
WARRANTY/REMEDY
Honeywell warrants goods of its manufacture as being free of
defective materials and faulty workmanship. Honeywell’s
standard product warranty applies unless agreed to otherwise
by Honeywell in writing; please refer to your order
acknowledgement or consult your local sales office for specific
warranty details. If warranted goods are returned to Honeywell
during the period of coverage, Honeywell will repair or replace,
at its option, without charge those items it finds defective. The
foregoing is buyer’s sole remedy and is in lieu of all other
warranties, expressed or implied, including those of
merchantability and fitness for a particular purpose. In no
event shall Honeywell be liable for consequential, special,
or indirect damages.
While we provide application assistance personally, through
our literature and the Honeywell web site, it is up to the
customer to determine the suitability of the product in the
application.
Specifications may change without notice. The information we
supply is believed to be accurate and reliable as of this
printing. However, we assume no responsibility for its use.
WARNING
MISUSE OF DOCUMENTATION
• The information presented in this product sheet is for
reference only. Do not use this document as a product
installation guide.
• Complete installation, operation, and maintenance
information is provided in the instructions supplied with
each product.
Failure to comply with these instructions could result in
death or serious injury.
SALES AND SERVICE
Honeywell serves its customers through a worldwide network
of sales offices, representatives and distributors. For
application assistance, current specifications, pricing or name
of the nearest Authorized Distributor, contact your local sales
office or:
E-mail: info.sc@honeywell.com
Internet: www.honeywell.com/sensing
Phone and Fax:
Asia Pacific +65 6355-2828
+65 6445-3033 Fax
Europe +44 (0) 1698 481481
+44 (0) 1698 481676 Fax
Latin America +1-305-805-8188
+1-305-883-8257 Fax
USA/Canada +1-800-537-6945
+1-815-235-6847
+1-815-235-6545 Fax
