When mounted in rows, the nominal device current can be limited to just 80% or must be over dimensioned accordingly. Phoenix Contact TCP Thermal Circuit Breaker. The compact TCP range of miniature thermal circuit breakers from Phoenix contacts have an integrated switching function which enables instant re-closure to ensure the availability of the system. Features and Benefits. IP40 rating Slow blow fuse Only 8.2mm wide Re-closable Available with nominal current levels from 0.1 to 10 A Screw or spring cage connections used as a basic terminal block