Home Support FAQs Q. What is a “PTC” and why should I have a choice between fused and PTC protected accessory product?
Q. What is a “PTC” and why should I have a choice between fused and PTC protected accessory product? PDF Print E-mail

A PTC is a semiconductor circuit breaker used to protect electronic circuits from overload conditions. A PTC does not need to be replaced after operation as a fuse would. To restore a PTC to operating condition, remove the load from that circuit for a few seconds and the PTC will restore. A PTC is also used in a circuit rated for Class 2 power limited operation, as a fuse is not acceptable for class 2 power limited operation by the listing agencies.

All LifeSafety Power distribution boards come either fuse rated at 3A per output (ie D8) or with Class II DTC rating of 2.5A per outputs (ie D8P).