Fc p2d series thermal protectors atc semitec pfcp0500504xx these snap action thermal protectors are designed to provide a cost effective solution in a range of motor transformer and lighting applications such as battery packs lighting fixtures electronic circuits heaters and automotive the conductive bimetal construction where the bimetal carries the circuit current ensures maximum sensitivity under short circuit conditions atc semitec pfcp0500504xx fc p2d series thermal cut out 50 c