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@POTRZBE posted:

Thank you for the quick response, Norm.  Being electrically challenged, can you tell me what it does?  One of its wires is hooked to the smoke unit.  It does not appear in Lionel's diagram of the 18003 engine.

If heat is generated by high current flow the resistance of the PTC increases to inhibit it (unlike a fuse that burns in the center and opens the circuit stopping the flow ).  It normally resets itself unlike a fuse that needs to be replaced.

John

Last edited by Craftech

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