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Home >> Chevrolet >> 2002 >> Astro Van Passenger, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 792 (Wiring Systems) >> Diagnostic Information and Procedures >> Testing for Intermittent and Poor Connections >> Circuit Protection - Circuit Breakers >> Positive Temperature Coefficient (PTC) Circuit Breaker

Positive Temperature Coefficient (PTC) Circuit Breaker

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2.

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