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
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7851 & 7854 Series
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
INCHES [MM]
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
2.0 [ 50.8]
(DOES NOT INCLUDE SEALING GASKET)
3
4
60˚C
38˚C
1
2
77°F 25°C
21˚C
,
0˚C
-18˚C
-40˚C
-51˚C
180
1.586 [40.28]
1.562 [39.67]
1.221 [31.01]
1.159 [29.44]
80
100
120
140
160
.562 [ 14.27]
MIN. PANEL HOLE DIA.
.430 [10.92]
.484 [12.29]
Ultimate Trip in % Rated Load
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]
(45°)
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)
EYELET FOR #10 SCREW (2 PLACES)
www.sensata.com
8
BUSINESS CENTER
http://www.sensata.com/
Sensata Technologies Inc.
529 Pleasant Street
Attleboro, MA 02703, USA
Phone: +1 508-236-3800
Fax: +1 508-236-2349
©2013 Sensata Technologies, Inc. All rights reserved worldwide. Printed in USA, revised April 2013.
Important Notice: Sensata Technologies reserves the right to make changes to, or to discontinue, any product or service
identified in this publication without notice. Before placing orders, users should obtain the latest version of the relevant
information to verify that the information being relied upon is current.
Sensata Technologies assumes no responsibility for customers’ product designs or applications. Users must determine the
suitability of the Sensata device described in this publication for their application, including the level of reliability required.
Many factors beyond Sensata’s control can affect the use and performance of a Sensata product in a particular application,
including the conditions under which the product is used and the time and environmental conditions in which the product
is expected to perform. As these factors are uniquely within the user’s knowledge and control, it is essential that the user
evaluate the Sensata product to determine whether it is fit for a particular purpose and suitable for the user’s application.
Sensata Technologies products are sold subject to Sensata’s Terms and Conditions of Sale which can be found at:
www.sensata.com/terms.htm
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