The Siemens 3VA1163-6MH36-0BC0 is a 3-pole IEC frame 160 molded case circuit breaker rated at 63 A with a 70 kA breaking capacity at 415 V AC (class H). It is configured for starter protection using a TM120M trip unit — magnetic-only, no overload function — so the overload protection is handled upstream by a separate motor starter or thermal relay. The short-circuit release is adjustable from 5 to 15 times In, giving you flexibility to coordinate with downstream components.
What the ratings mean for fit
The 70 kA Icu at 415 V AC is the maximum short-circuit current the breaker can safely interrupt once — it's rated for the high available fault currents typical in industrial switchgear, not residential panels. The 63 A continuous rating matches a 37 kW motor at 400 V (roughly 60 A FLA) or a 45 kW motor if the service factor allows. The magnetic-only TM120M means this breaker does not provide thermal overload protection; it's intended for motor branch circuits where a separate overload relay handles the thermal curve. The undervoltage release (UVR) at 24 V DC will trip the breaker if control voltage is lost — common in emergency-stop chains or safety circuits where loss of power must open the motor circuit.