Series 18X Hi-Amp Circuit Breaker Series 187 Marine Rated Circuit Breaker (MRCB)
Specifications
Single Pole Thermal Type Breakers
Applications: Typically used in DC power systems in marine applications (as a main or
branch circuit breaker), truck and bus systems, RV systems, add-on protection for
accessories, lift gates, etc. This unit is external ignition protected and weatherproof.
Rating: 25-150A, 48Vdc
Interrupt Rating: Main Breaker Protection Interrupt Rating (5kA@ 12Vdc). (Consult factory for
higher voltage interrupt ratings.)
Operating Temperature Rating: –40°F (–40°C) to 185°F (85°C)
Storage Temperature Rating: –40°F (–40°C) to 260°F (125°C)
Materials: Black UL-rated 94V0 thermoset plastic body. Cover and lever are UL-rated 94V0
thermoplastic
Marking: Standard marking includes amp/volt ratings. Custom markings also available
Termination: 5/16-18 threaded studs
Torque Rating: 75 in-lbs (8.5N•m) max
Mounting Torque Rating: Panel or surface-mount options; 50 in-lbs (5.6 N•m) max
Ingress Protection Rating: IP66
Features / Options: A manual reset circuit breaker with On-Off switch capability
Compliances: ABYC E-11; CE; SAE J1171 (ignition protected)
Consult factory for time characteristic curves.
Manual Reset Circuit Breakers With Switch Function
Dimensions - mm(in)
Part Numbering System
(Dims. shown are for reference only. Consult factory for latest prints)
Specifications
Single Pole Thermal Type Breakers
Applications: Typically used in auxiliary and accessory circuits in truck, bus’, RVs and marine systems.
Others include battery chargers and DC audio systems. Series 181, 184 & 185 are sealed for engine
compartment and bilge area applications.
Rating: 25-150A, 30Vdc; 48Vdc (Series 184 & 185)
Interrupt Rating: 3000A @ 30Vdc
Operating Temperature Rating: –25°F (–32°C) to 180°F (82°C)
Storage Temperature Rating: –30°F (–34°C) to 300°F (149°C)
Materials: Black UL-rated 94V0 thermoset plastic. Thermoplastic elastomer stud insulators are
provided on covered units with F-style (surface-mount) bases
Marking: Standard marking includes amp ratings and part numbers. Custom markings also available.
Termination: 1/4-28 threaded studs
Torque Rating: 50 in-lbs (5.6N•m) max
Mounting Torque Rating: Panel or surface-mount options; 50 in-lbs (5.6N•m) max. Threaded insert
option has a max torque of 25 in-lbs (2.8N•m).
Ingress Protection Rating: IP67
Features / Options: Series 184 & 185 have a unique reset mechanism which provides visual indication
of tripped condition. Series 185 also features a push-to-trip option
Compliances: SAE J1625; ABYC E-11; CE; SAE J1171 (ignition protected)
Auto, Manual & Switchable Reset Circuit Breakers
Dimensions - in(mm) (Dims. shown are for reference only. Consult factory for latest prints)
RESET
1.05
(26.67)
2.23
(56.64)
2.89
(73.41)
1.44
(36.58) 1.79
(45.47)
.66
(16.76)
1.09*
(27.69)
.40
(10.16)
1.90
(48.26)
Stud insulators
.26 (6.60) dia.
Mtg.holes (2)
Reset lever
(Shown in
operating
position series
184/185)
.26 (6.60) dia.
Mtg.holes (2) Reset lever
(Shown tripped)
1/4-28 Studs
Molded
cover
Molded
cover
*Overall heights of
Series 181 &183
Trip button (Series 185)
.57
(14.49) 1.06
(26.92)
.31
(7.87)
.89 (22.61)
1.44*
(36.58)
Tamper proof
cover
1.90
(48.26)
2.91
(73.91) 2.41
(61.21)
1.54
(39.12)
Surface Mount Panel Mount
600%
500%
500200100403020151050
400%
300%
200%
200%
150%
100%
50%
0%
100%
TIME VS. PERCENT OF RATED CURRENT
TIME IN SECONDS
% 0F RATED CURRENT % 0F RATED CURRENT
-50º 50º 77º 100º 150º 200º 250º0º
(-45º) (10º)(25º)(38º) (65º) (93º) (121º)(-18º)
TEMPERATURE IN DEGREES F °
(TEMPERATURE IN DEGREES C °)
TEMPERATURE DERATING CURVES
Flange mount
gasket for
thru-wall
applications
(option 07)
Part Numbering System
Series
1 8
181 – Type I, 30V
183 – Type I*, 30V
184 – Type III, 42V
185 – Type III-PTT, 42V
Rating
025 – 25 amps
030 – 30 amps
035 – 35 amps
040 – 40 amps
050 – 50 amps
060 – 60 amps
070 – 70 amps
080 – 80 amps
090 – 90 amps
100 – 100 amps
110 – 110 amps
120 – 120 amps
135 – 135 amps
150 – 150 amps
Mounting
– –
F – Surface Mount
P – Panel Mount
Terminal Hdwr.
00 – Ship w/o nuts
01 – Sems nuts installed
02 – Sems nuts shipped bulk
03 – Stainless Steel Std. nuts &
washers installed
04 – Stainless Steel Std. nuts &
washers shipped bulk
07 – Flange gasket & Sems nuts installed
(Panel Mount Only)
08 – Threaded insert and Sems nuts
installed
12 – Stainless steel nuts and lockwashers
installed
13 – Stainless steel Sems nut installed
Marking
0 – Blank cover
1 – Standard Marking; Part Number,
Amp Rating
181, 184, 185 Series - Top Surface
183 Series - Side Surface
S – Standard Ignition Protected
Marking
(Consult factory for special markings.)
*183 Available in Panel
Mount Only (Coverless)
R
MRCB
BUSS
TRIP
OFF
RESET
48V DC MAX
25A
IGNITION PROTECTED
WEATHERPROOF
69.85
[2.750]
28.84
[1.135]
ON 16.76
[.660]
26.81
[1.056]
53.47
[2.105]
57.68
[2.271]
(2.24)
56.8
(2.32)
59.0
(1.06)
27.1
(1.64)
41.6
( .72)
43.8
( 2.72)
69.0
(.16)
3.9
(1.46)
37.1
(.73)
18.6
(3.44)
87.3
60.34
[2.375]
58.15
[2.289]
MRCB
25A
48V DC MAX
WEATHERPROOF
IGNITION PROTECTED
RESET
BUSS
OFF
ON
Panel Mount
Mounting Template
Firewall Mount
Series
1 8 7
187 – Manual Reset - Switching
Style Circuit Breaker
Rating
025 – 25 amps
030 – 30 amps
035 – 35 amps
040 – 40 amps
050 – 50 amps
060 – 60 amps
070 – 70 amps
080 – 80 amps
100 – 100 amps
110 – 110 amps
120 – 120 amps
135 – 135 amps
150 – 150 amps
200 – 200 amps
Mounting
–
F – Surface mount
P – Panel mount
Hardware
–
00 – No hardware
03 – Stainless nuts &
lockwashers - installed
on studs
04 – Stainless nuts &
lockwashers - supplied
bulk packed
Marking
1 – Standard marking; Part Number,
Amp Rating
(Consult factory for special marking options.)
0 5 10 15 20 30 40 50 100 150 200 400 600
600%
500%
400%
300%
200%
100%
Time vs Percent of Rated Current
Time in seconds
%
OF
RATED
CURRENT
Temperature Derating Curves
Temperature in Degrees F.
%
OF
RATED
CURRENT -50˚ F 0˚ F 50˚ F 77˚ F 100˚ F 150˚ F 200˚ F 250˚ F
0%
50%
100%
150%
200%
Cooper Bussmann Transportation Products • Phone: 800.845.6269 • Fax: 503.692.9091 • www.cooperbussmann.com Cooper Bussmann Transportation Products • Phone: 800.845.6269 • Fax: 503.692.9091 • www.cooperbussmann.com
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