Siemens 3VA1163-6MH32-0CA0 — 63A IEC Frame 160 Circuit Breaker with Undervoltage Release
The Siemens 3VA1163-6MH32-0CA0 is a 3-pole IEC frame 160 circuit breaker rated 63 A with a breaking capacity class H — Icu of 70 kA at 415 V AC. That 70 kA interrupting rating means it can safely clear a fault current up to that level without upstream devices needing to trip, which is what makes it suitable for high-fault installations like industrial main feeders or large motor control centers. This variant is configured for starter protection with a TM120M thermal-magnetic trip unit, but note the description explicitly states it provides short-circuit protection only — no overload protection is included. The short-circuit pickup Ii is adjustable 5 to 15 x In (315 A to 945 A). It also ships with a nut keeper kit and an undervoltage release (UVR) rated 120-127 V AC, 50/60 Hz. Mounts on standard DIN rail or panel-mount within the 3VA1 enclosure family. The UVR coil holds at 120-127 V AC; below dropout voltage the breaker trips, which is typical for emergency-stop or undervoltage protection schemes where loss of control power must open the main circuit.
Integration Notes
The 3VA1 frame accepts plug-in accessories like auxiliary contacts, shunt trips, and alarm switches — the UVR here occupies one accessory slot. Verify the nut keeper kit is installed before torquing busbar connections; it prevents hardware migration under vibration. At 63 A on a 160 A frame, thermal rise is well within limits — the larger frame gives headroom for higher ambient temperatures or enclosed panel mounting without derating concerns. The class H breaking capacity (70 kA @ 415 V) exceeds typical 25-50 kA requirements for most industrial distribution, so selectivity coordination with downstream breakers is straightforward.