What the ratings mean for fit
The Siemens 3VA1150-3EF36-0HC0 is a 3-pole IEC frame 160 molded-case circuit breaker with a 50 A continuous rating and a breaking capacity of 25 kA at 415 V (class N). That 25 kA Icu means it can safely interrupt a fault current up to that level without welding contacts or cascading failure upstream — critical for panel coordination studies. The TM240 thermal-magnetic trip unit gives adjustable overload protection (Ir = 35…50 A) and fixed short-circuit pickup (Ii = 5…10 x In), so you set the overload band to match the cable or motor full-load amps. The shunt trip (STL) operates on 12–30 V DC or 24 V AC, letting a remote safety relay or E-stop string drop the breaker without a separate control transformer. Two HQ auxiliary switches report the main contact position back to the PLC or status lamp.
Lifecycle and sourcing reality
Lifecycle stage is 'current' — Siemens actively manufactures and supports this part. No last-time-buy notice or successor code exists.