7851 & 7854 series
12.5 to 60 Amp commercial Thermal circuit Breaker
FEATuREs
• 30VDC or 120VAC, 12.5 to 60 Amps
• Sealed assemblies, manual and automatic reset options
• Ignition protected SAE J1171
• Weatherproof SAE J553
• UL Recognized E36869
ORDERING INFORMATION
X−X−X−X
Configuration
7851 = Manual, sealed
7854 = Auto, sealed
Stud Length (approx)
18 = 0.310” for 7851 & 7854
37 = 0.455” for 7851
26 = 0.455” for 7854
13 = 0.610” for 7851
15 = 0.610” for 7854
Amp Rating
(12.5, 15, 17.5, 20, 25, 30
35, 40, 50, 60)
Mounting Nuts
= leave blank for none
I
= optional mounting nuts
DEscRIpTION
The KLIXON® 7851 and 7854 series thermal breakers were designed
to protect wiring and meet the harshest environmental requirements.
The 7851 and 7854 series closed construction circuit breakers are
weatherproof sealed for protection against moisture, dust, grease, fuel
vapors and other harsh environments. The 7851 and 7854 series breakers
are compact, lightweight and designed to interrupt short circuits or
overloads, and combine trip-free protection with fast response time.
Typical applications are protection of wire cable of accessory circuits,
equipment and battery protection in construction and off-road equipment,
marine, recreational vehicles (RV’s), mining, agricultural equipment and
electric (hybrid) vehicles.
pERFORMANcE cHARAcTERIsTIcs
Calibration : 200% rated
12.5 to 60 amps : 5 to 55 seconds
current, 77°F (25°C)
Ultimate Trip At 77°F (25°C) Must hold 100%, Must trip 135%
Endurance Per SAE J553
Interrupt Current Capacity Per SAE J553 and ABYC E-11
Vibration 10G MIL-STD-202 Method 204, Condition A
Salt Spray MIL-STD-202 Method 101D
Dielectric Strength MIL-STD-202 Method 301, 1500VAC min
Insulation Resistance MIL-STD-202 Method 302, Condition B, 100MΩ min
Weight (with mounting nuts)
7851 : 54 grams max
7854 : 49 grams max
TRIp cuRVE - Approximate Time, Current Characteristics At 77°F (25°C)
Current in % Rated Load
1000
500
100
.10
1
10
100
1000
10,000
Trip Time in Seconds
DIMENsIONs -
7851
INCHES [MM]
2.0 [ 50.8]
SEE NOTE 1
DERATING cuRVE
160˚F
71˚C
Ambient Temperature in °F, °C
140˚F
100˚F
70˚F
32˚F
0˚F
-40˚F
-60˚F
40
60
3
4
77°F, 25°C
60˚C
38˚C
21˚C
0˚C
-18˚C
-40˚C
-51˚C
180
1
2
1.586 [40.28]
1.562 [39.67]
1.221 [31.01]
1.159 [29.44]
(DOES NOT INCLUDE SEALING GASKET)
80
100
120
140
160
.562 [ 14.27]
MIN. PANEL HOLE DIA.
.430 [10.92]
.484 [12.29]
1.531 [38.89]
1.469 [37.31]
OPTIONAL #8-32 UNC-2B
MOUNTING NUT
(2 PLACES)
x2 WASHER FOR #10 SCREW (2 PLACES)
# 10-32 UNF - 2B NUT (2 PLACES)
#10-32 UNF - 2A TERMINAL (2 PLACES)
.791 [20.09]
.729 [18.52]
Sensata
Technologies
Ultimate Trip in % Rated Load
Performance characteristics are based on room
temperature (77°F, 25°C). Consult Derating curve for
ambient temperatures significantly higher or lower than
standard room temperature.
Example:
At 77°F (25°C) the device is calibrated to hold
at 100% of rated current (1) and trip at 135% of rated
current (2). At 140°F (60°C), the same device will hold
at approximately 78% of rated current (3), and trip at
approximately 115% of rated current (4).
.637 [16.18]
STYCAST SEAL
(2 PLACES)
(45°)
MADE
IN MEXICO
R
EYELET FOR #10 SCREW (2 PLACES)
Sensata Technologies Inc.
529 Pleasant Street
Attleboro, MA 02703, USA
Phone: +1 508-236-3287
http://www.sensata.com/
Important Notice: Sensata Technologies (Sensata) reserves
the right to make changes to or discontinue any product or
service identified in this publication without notice. Sensata
advises its customers to obtain the latest version of the
relevant information to verify, before placing any orders,
that the information being relied upon is current. Sensata
assumes no responsibility for infringement of patents or
rights of others based on Sensata applications assistance
or product specifications since Sensata does not possess
full access concerning the use or application of customers’
products. Sensata also assumes no responsibility for
customers’ product designs.
