1© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
One world. One KEMET
Benets
• High reliability for on/off operations
• High-speed response
• Long operational life
• Excellent environmental durability
• Compatibility with extremely low (0.1 mW or lower)
signals to high power (6 W) levels
• Extremely simple circuit design
• Compact, light and easy to handle
• Dust, explosion and corrosion-proof
• Wide range of operating temperatures available in 5°C
increments from +30°C to +130°C
• UL, CSA and TÜV approved
• RoHS/REACH compliant
Thermal Sensors
OHD Thermal Guard
Overview
The OHD Thermal Guard is developed for thermal problem
countermeasures and safety standard conformity, which
are becoming increasingly important for electronic devices
in recent years.
Its unique proprietary design features a magnet and
a temperature-sensing soft ferromagnetic substance
called Thermorite®. The material’s magnetic ux density
decreases as the temperature increases turning it into a
paramagnetic substance at the Curie temperature.
Applications
Typical applications include atmospheric temperature
detection and overheating monitoring of power transistors,
power modules, room heaters, hot gas heaters, PPCs,
ampliers, motors, HDDs, FDDs and other general
appliances.
OHD5ROHD3OHD1
2© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
Ordering Information
OHD 1- 50 B
Series
Maximum
Opening/Closing
Power (W)
Operating Temperature
(°C) Contact
Type
OHD 1 = 6W
3 = 6W
5R = 1W
30 = 30°C
35 = 35°C
40 = 40°C
45 = 45°C
50 = 50°C
55 = 55°C
60 = 60°C
65 = 65°C
70 = 70°C
75 = 75°C
80 = 80°C
85 = 85°C
90 = 90°C
95 = 95°C
100 = 100°C
105 = 105°C
110 = 110°C
115 = 115°C
120 = 120°C
125 = 125°C
130 = 130°C
B = Break
M = Make
(OHD1 and
OHD3 only)
Structures and Principles of Operation
Thermal Guard (OHD) are temperature-sensing switches composed of a magnet and a temperature-sensing soft
ferromagnetic substance called Thermorite. This material’s saturation magnetic ux density decreases as the temperature
increases, and it turns into a paramagnetic substance at its Curie temperature.
Thermorite properties
• Thermorite changes its magnetic property rapidly at its Curie temperature, providing quick response times.
• The Curie temperature of Thermorite does not vary with time, as it is based on a compounding ratio.
• Thermorite is stable against moisture and hazardous gas.
●All specications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specication sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2015.3.31　0000SENVOL14E1503H1
NEC TOKIN Sensors Vol.14　5
Structures and Principles of Operation
Thermal Reed Switches (TRS
TM
) are temperature-sensing switches composed of a magnet and a temperature-
sensing soft ferromagnetic substance called Thermorite
TM
. This material's saturation magnetic fl ux density
decreases as the temperature increases, and it turns into a paramagnetic substance at the Curie temperature.
Temperature sensing ferrite （Thermorite
Ⓡ
）
◆Our self-developed Themorite is temperature sensing ferrite utilizing Curie-temperature,
where ferrites lose its magnetic property.
Thermorite changes its magnetic property rapidly at Curie-temperature.
◆Features of Thermorite as temperature sensing material.
(1) Curie-temperature do not vary as time advances, because it depends on compounding ratio.
(2) Arbitrary shape available as ceramics.
(3) Stable against moist or hazardous gas.
Structure of reed switch
◆
Reed switch is contact switch comprised of a pair of
Fe-Ni alloy reeds encased in glass tube
with inactive gas. The reeds are switched on or off
by magnetic field of permanent magnet or magnet
coil.
◆
Long lifetime, High environmental resistance
because of protected contact by glass encasing.
◆
Reeds in glass tube become magnetized with
magnetic field, and then two reeds contact and
connect each other (switch on). And then magnetic
field disappears, the reeds separate and disconnect
(switch off).
0
6000 （1kHz-0.01Oe）
5000
4000
3000
2000
1000
0
20 40 60 80 100
Temperature（℃）
Permeability - temperature
Thermal property of Thermorite
Permeability
120 140 160 0
0
500
1000
1500
2000
2500
3000
3500
20 40 60 80 100
Temperature（℃）
Saturation magnetic flux density ‒ temperature
Saturation magnetic flux density
TC=Curie temperature
120 140 160
TC＝30 TC＝60
TC＝90
TC＝120
TC＝150
TC＝30
TC＝60
TC＝90
TC＝120
TC＝150
N
S
S NN
S
N
N
S
S
Encasing Glass tube
ContactInactive gas Fe-Ni alloy reed
3© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
Structures and Principles of Operation cont’d
●All specications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specication sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2015.3.31　0000SENVOL14E1503H1
NEC TOKIN Sensors Vol.14　5
Structures and Principles of Operation
Thermal Reed Switches (TRS
TM
) are temperature-sensing switches composed of a magnet and a temperature-
sensing soft ferromagnetic substance called Thermorite
TM
. This material's saturation magnetic fl ux density
decreases as the temperature increases, and it turns into a paramagnetic substance at the Curie temperature.
Temperature sensing ferrite （Thermorite
Ⓡ
）
◆Our self-developed Themorite is temperature sensing ferrite utilizing Curie-temperature,
where ferrites lose its magnetic property.
Thermorite changes its magnetic property rapidly at Curie-temperature.
◆Features of Thermorite as temperature sensing material.
(1) Curie-temperature do not vary as time advances, because it depends on compounding ratio.
(2) Arbitrary shape available as ceramics.
(3) Stable against moist or hazardous gas.
Structure of reed switch
◆
Reed switch is contact switch comprised of a pair of
Fe-Ni alloy reeds encased in glass tube
with inactive gas. The reeds are switched on or off
by magnetic field of permanent magnet or magnet
coil.
◆
Long lifetime, High environmental resistance
because of protected contact by glass encasing.
◆
Reeds in glass tube become magnetized with
magnetic field, and then two reeds contact and
connect each other (switch on). And then magnetic
field disappears, the reeds separate and disconnect
(switch off).
0
6000 （1kHz-0.01Oe）
5000
4000
3000
2000
1000
0
20 40 60 80 100
Temperature（℃）
Permeability - temperature
Thermal property of Thermorite
Permeability
120 140 160 0
0
500
1000
1500
2000
2500
3000
3500
20 40 60 80 100
Temperature（℃）
Saturation magnetic flux density ‒ temperature
Saturation magnetic flux density
TC=Curie temperature
120 140 160
TC＝30 TC＝60
TC＝90
TC＝120
TC＝150
TC＝30
TC＝60
TC＝90
TC＝120
TC＝150
N
S
S NN
S
N
N
S
S
Encasing Glass tube
ContactInactive gas
Fe-Ni alloy reed
Reed switch structure
• The reed switch is a contact switch comprised of a pair of Fe-Ni alloy
reeds encased in a glass tube with inactive gas. The reeds are switched
on or off by the magnetic eld of a permanent magnet or magnet coil.
• The reeds in the glass tube become magnetized from the magnetic
eld, allowing the two reeds to make contact and connect (switch on).
When the magnetic eld disappears, the reeds separate and disconnect
(switch off).
• The glass encasement of the reeds ensures high environmental
resistance and a long operational life.
OHD principle: Break (B) type
●All specications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specication sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2015.3.31　0000SENVOL14E1503H1
6　NEC TOKIN Sensors Vol.14
N S
N S
N S
N S
N S
N S
S N
S N
Thermal magnet = paramagnet
®
Reset temperature Action temperature
Magnetic Flux Forming => Reed switch ON
＜Magnetic Field of Contact Part＞
N
S
S N
N S N S
N S N S
Thermal magnet = NO magnetic
Low temperature High temperature
Switch ON Switch OFF
Magnetic Flux ≒0 => Reed switch OFF
＜Magnetic Field of Contact Part＞
TRS principle : Break (B) type
TRS principle : Make (M) type
OHD principle: Make (M) type
●All specications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specication sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2015.3.31　0000SENVOL14E1503H1
6　NEC TOKIN Sensors Vol.14
S
N
S N S N
N S
N S SP
N S
N S
N S
Thermal magnet = paramagnet
®
Reset temperature Action temperature
N S
Thermal magnet = NO magnetic
Low temperature High temperature
Switch OFF Switch ON
Magnetic Flux ≒0 => Reed switch OFF
＜Magnetic Field of Contact Part＞
N S
N S SP
N S
N S
N S N S
N S N S
＜Magnetic Field of Contact Part＞
TRS principle : Break (B) type
TRS principle : Make (M) type
4© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
External Magnetic Field
OHD installation in external magnetic eld
N S
N S
N S
N S
Magnet inside OHD is
parallel to the external field
→ Greater Influence
Wrong direction
Magnet inside OHD is
perpendicular to the external field
→ Less influence
Magnetic field from equipment
Magnetic field emitting equipment
such as motors, coils
0
－5
－4
－3
－2
－1
0
1
2
Operation temperature variation (°C)
Gap distance_d（mm）
3
2 4 6 8 10 12 14 16
BType
Soft iron (thickness 3.3mm)
MType
d
OHD
Correct direction
Ferromagnetic material inuence
N S
N S
N S
N S
Magnet inside OHD is
parallel to the external field
→ Greater Influence
Wrong direction
Magnet inside OHD is
perpendicular to the external field
→ Less influence
Magnetic field from equipment
Magnetic field emitting equipment
such as motors, coils
0
－5
－4
－3
－2
－1
0
1
2
Operation temperature variation (°C)
Gap distance_d（mm）
3
2 4 6 8 10 12 14 16
BType
Soft iron (thickness 3.3mm)
MType
d
OHD
Correct direction
5© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
Dimensions – Millimeters
Part
Number
Dimensions - Millimeters
OHD1
OHD1
mounting
bracket
Mounting brackets designed specically
for OHD1 type are provided optionally,
at separate cost.
Part number is OHD1BRACKET.
OHD3
OHD5R
6© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
Environmental Compliance
All KEMET DC Line Filters are RoHS Compliant.
Insulation & Temperature Characteristics
Shape Type
Insulation
Withstand
Voltage1
Minimum
Insulation
Resistance1
Operating
Temperature
Range
Switching
Temperature
Range
Switching
Temperature
Precision2
Differential
Temperature3
OHD1 2,500 VAC/1 minute
or
3,000 VAC/1 second 500 VDC
to 100 MΩ
−20°C
to +150°C
+30°C
to +130°C ±5°C 10°C
Maximum
OHD3
OHD5R
1,500 VAC/1 minute
or
1,800 VAC/1 second
1 Between wire harness and mounting resin surface.
2 Switching temperature precision does not include measurement error.
3 The differential temperature is also referred to as the hysteresis temperature on thermal sensors.
Table 1 – Ratings & Part Number Reference
Part
Number
Switching
Temperature
(°C)
Maximum
Differential
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
Weight
(g) Approval
OHD1-30M 30°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-35M 35°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-40M 40°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-45M 45°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-50M 50°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-55M 55°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-60M 60°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-65M 65°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-70M 70°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-75M 75°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-80M 80°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-85M 85°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-90M 90°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-95M 95°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-100M 100°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
7© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
Table 1 – Ratings & Part Number Reference cont.
Part
Number
Switching
Temperature
(°C)
Maximum
Differential
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
Weight
(g) Approval
OHD1-105M 105°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-110M 110°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-115M 115°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-120M 120°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-125M 125°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-130M 130°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.8 UL & CSA & TÜV
OHD1-30B 30°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-35B 35°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-40B 40°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-45B 45°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-50B 50°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-55B 55°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-60B 60°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-65B 65°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-70B 70°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-75B 75°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-80B 80°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-85B 85°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-90B 90°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-95B 95°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-100B 100°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-105B 105°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-110B 110°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-115B 115°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-120B 120°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-125B 125°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD1-130B 130°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 1.4 UL & CSA & TÜV
OHD3-30M 30°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-35M 35°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-40M 40°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-45M 45°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-50M 50°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-55M 55°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-60M 60°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-65M 65°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-70M 70°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-75M 75°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-80M 80°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-85M 85°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-90M 90°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-95M 95°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-100M 100°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
8© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
Table 1 – Ratings & Part Number Reference cont.
Part
Number
Switching
Temperature
(°C)
Maximum
Differential
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
Weight
(g) Approval
OHD3-105M 105°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-110M 110°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-115M 115°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-120M 120°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-125M 125°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-130M 130°C ±5°C 10°C Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.8 UL & CSA & TÜV
OHD3-30B 30°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-35B 35°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-40B 40°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-45B 45°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-50B 50°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-55B 55°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-60B 60°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-65B 65°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-70B 70°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-75B 75°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-80B 80°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-85B 85°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-90B 90°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-95B 95°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-100B 100°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-105B 105°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-110B 110°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-115B 115°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-120B 120°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-125B 125°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD3-130B 130°C ±5°C 10°C Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150 2.4 UL & CSA & TÜV
OHD5R-30B 30°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-35B 35°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-40B 40°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-45B 45°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-50B 50°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-55B 55°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-60B 60°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-65B 65°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-70B 70°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-75B 75°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-80B 80°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-85B 85°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-90B 90°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-95B 95°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-100B 100°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
9© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
Table 1 – Ratings & Part Number Reference cont.
Table 2 – Ratings & Part Number Reference
Part Type
Packaging Type
Pieces per Tray
Pieces per Box
OHD1
Tray
120
1,200
OHD3
100
1,000
OHD5R
700
OHD1BRACKET
Plastic Bag
1,000
1,000
Part
Number
Switching
Temperature
(°C)
Maximum
Differential
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
Weight
(g) Approval
OHD5R-105B 105°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-110B 110°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-115B 115°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-120B 120°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-125B 125°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
OHD5R-130B 130°C ±5°C 10°C Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300 1.1 UL & CSA & TÜV
10© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
Handling Precautions
Precautions to be taken when using Thermal Reed Switches
(Please read these precautions before using our products)
• Do NOT use in close proximity to strong magnetic parts.
• Do NOT use product under mechanical weight load.
• Do NOT use if dropped or severely shocked.
• Do NOT use with a greater load than specied.
• Avoid stress (especially torsion) in case of additional processing.
• Thermal guards have a specic resonance frequency. Please contact a KEMET representative if an oscillation is added.
• OHD1 and OHD5R are designed for printed circuit board insertion. OHD3 is reed wire soldered type.
Export Control
For customers in Japan
For products which are controlled items subject to the ”Foreign Exchange and Foreign Trade Law” of Japan, the export
license specied by the law is required for export.
For customers outside Japan
Thermal Sensors should not be used or sold for use in the development, production, stockpiling or utilization of any
conventional weapons or mass-destructive weapons (nuclear weapons, chemical or biological weapons, or missiles), or any
other weapons.
11© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard SE0202_OHD • 10/29/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Thermal Sensors – OHD Thermal Guard
KEMET Electronics Corporation Sales Offi ces
For a complete list of our global sales offi ces, please visit www.kemet.com/sales.
Disclaimer
All product speci cations, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for
checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given
herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such
applications, but are not intended to constitute – and KEMET speci cally disclaims – any warranty concerning suitability for a speci c customer application or use.
The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any
technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes
no obligation or liability for the advice given or results obtained.
Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component
failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards
(such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury
or property damage.
Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicted or that other
measures may not be required.
KEMET is a registered trademark of KEMET Electronics Corporation.