What this breaker delivers
The Siemens 3VA1050-3ED42-0CA0 is a 4-pole IEC frame 100 molded-case circuit breaker with a 50 A fixed thermal-magnetic trip (TM210) and a 25 kA interrupting capacity at 415 V AC (class N). That 25 kA rating at 415 V means it can safely clear a fault up to that level without upstream cascading — critical for panel coordination in a 400 V line where the available fault current might hit that ceiling. The built-in undervoltage release (UVR) operates on 120–127 V AC, 50/60 Hz, and drops the breaker if control voltage falls below the dropout threshold, which keeps motor starters from re-energizing after a sag.
Fit and deployment
Mounts on a DIN rail in a standard panel enclosure. The 4-pole configuration with unprotected N conductor suits TN or TT systems where the neutral is not switched. The fixed Ir=50 A overload setting and fixed Ii=10 x In short-circuit pickup (500 A magnetic) mean no adjustment dials — set-and-forget for a dedicated feeder or motor branch. The nut keeper kit retains the terminal hardware under vibration, which matters on a weld line or conveyor drive panel.