What this breaker is and what the ratings mean for fit
The Siemens 3VM1150-4GE42-0AA0 is a 4-pole circuit breaker on the 3VM1 IEC frame 160, rated 50 A with a TM220 thermal-magnetic trip unit. The 36 kA breaking capacity at 415 V (class S) means it can safely interrupt a fault current up to that level on a 415 V line — the standard industrial distribution voltage outside North America — without welding its contacts or cascading the fault upstream to the main breaker. That is the spec that decides whether it coordinates with your existing switchgear's SCCR. Overload protection is adjustable Ir = 35 A to 50 A (the TM220 dial range), so you set it to match the continuous load current of the downstream feeder — cable or busway — not the breaker's 50 A nameplate. Short-circuit magnetic pickup is fixed at 10 × In (500 A), which is a standard motor-starting withstand level for a general-purpose line-protection breaker. The N-conductor protection is 100 %, meaning the neutral pole trips at the same threshold as the phase poles — required on 4-wire systems where the neutral carries harmonic currents.
Sourcing and lifecycle — what a buyer needs to know
Export controls are AL: N / ECCN: N — no special licensing for most destinations. RoHS compliant since June 2012; REACH Article 33 duty applies due to lead content above 0.1 % w/w (CAS 7439-92-1) in the candidate list. The certification note on the description line indicates CE and EEQCO Scheme-X are available; UL/CSA are not listed for this variant, so verify with your local inspector if the installation requires a UL-listed breaker.
Panel integration — DIN rail and enclosure fit
The 3VM1 frame 160 mounts on a standard DIN rail (EN 60715) in a distribution panel or motor control center. Four-pole construction means it occupies the full width of the frame — plan for a 72 mm module width (typical for this frame size). The line and load terminals accept copper or aluminum conductors up to the frame rating; torque values are on the label. The nut keeper kit included in the description ensures the terminal screws stay captive during wiring — a small thing that saves time on a panel build.