Line protection with selectivity headroom
The Siemens 3VA1163-5GD46-0DA0 is a 4-pole IEC frame 160 circuit breaker with a 63 A fixed thermal-magnetic trip unit (TM210). The 'M' breaking capacity class delivers 55 kA Icu at 415 V AC, which means it can safely interrupt fault currents up to that level without upstream cascading — a key figure for panel builders coordinating selectivity in a 415 V distribution board. Short-circuit protection is fixed at 10 x In (630 A), and the N conductor is protected at 100% — matching the phase rating. The integrated undervoltage release (208-230 V AC, 50/60 Hz) trips the breaker when control voltage drops, a standard requirement for motor feeder circuits or emergency-stop chains.
Panel integration
Clamp connection terminals accept copper conductors without lug crimping — speeds wiring in a panel build. The 4-pole format (3 phases + N) fits standard DIN-rail mounting in a 160 A frame footprint. The undervoltage release accessory is factory-fitted, so no field assembly of the shunt trip or UVR module is needed.