The World Depends on Sensors and Controls
Automotive Breakers:
    Circuit Breaker
ATC Footprint:
EXT 500 Type 1
    Circuit Breaker
ATC Footprint:
EXT 200 Type 2
    Circuit Breaker
MAXI Footprint:
Maxi Breaker® series
    Circuit Breaker
MINI Footprint:
Mini Breaker® series

Site Updated February 16, 2018

* * * Sensata > Products > Circuit Breakers > Automotive > EXT500

Automotive Circuit Breakers
EXT 500 Series

Overview Data Sheet (PDF)  

SAE Type 1 (cycling)
Multiple bimetallic resistivities available
Metal Encased
Multiple terminal configurations available
Ambient compensated

Can be mounted in the fuse block or elsewhere in the wiring harness
Protected from abuse and contamination of the contact surface
Meets longer life cycle requirements

Sensata Technologies’ EXT 500 Series of circuit breakers are designed for wiring harness protection in 12 Volt automotive applications. The device protects circuits which occasionally experience momentary overloads and applications where self-resetting devices are preferred. The EXT 500 is sensitive to both over-current and over-temperature fault conditions. The unique arrangement of two opposing bimetallic elements results in a device that is insensitive to momentary overloads.

Sensata Technologies is an ISO and TS registered company providing world class quality products.

General Envelope Dimensions, mm (inches)
Nominal dimensions provided for reference only.


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Thermal Circuit Breakers

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Peerless Electronics Inc.
700 Hicksville Road
Suite 100
Bethpage NY 11714
Phone: 516-594-3500
Phone: 800-285-2121
Fax: 516-593-2179

Trip Curve

Diagram: Approximate effect of ambient temperature on ultimate trip
General Specifications
Nominal Operating Voltage
12 Volts DC
Typical voltage drop at operating temperature
200 mV max
Typical ambient temperature range
-40ºC to 85ºC

These curves are to be used only as a guide in selecting a protector for a particular application. Factors such as distance from the heat source and the method of mounting should be considered in selecting a protector. Final trip times are dependent upon terminal configuration and mounting in the application.

All Sensata Circuit Breakers do not contain any hazardous materials and are 100% in compliance with the Substance of Concern (SoC), ELV and RoHS directives.

The World Depends on Sensors and Controls
The World Depends on Sensors and Controls