What this 630 A frame breaker carries
The 3VA1463-5GF42-0KH0: This is a Siemens 3VA1 IEC frame 630 molded case circuit breaker in breaking capacity class M, rated Icu=55kA at 415 V AC. It is a 4-pole unit with a TM240 thermal-magnetic trip unit, rated In=630 A. The overload protection band is adjustable Ir=440 A to 630 A; short-circuit protection Ii is set 4 to 8 times In. The neutral conductor is protected at 100%. This is a fully assembled line-protection breaker — order it, land it in the panel, terminate the bus.
We source this to order against an RFQ. If you are freezing a panel design or stocking a critical spare, this is a good time to secure your allocation.
Class M (medium breaking capacity) is the standard choice for most industrial distribution boards fed from a transformer of moderate kVA. It is not the high-end class H (100 kA+) for utility-tied switchgear, but it covers the vast majority of plant-floor main and feeder applications. The TM240 thermal-magnetic trip gives a fixed magnetic pickup range of 4 to 8 times In (2520 A to 5040 A at the 630 A setting). That suits motor-starting inrush and general distribution where you need coordination with downstream branch breakers. The adjustable overload band Ir=440 A to 630 A lets you fine-tune the continuous current rating without swapping the trip unit — useful when the connected load is known but not exactly at the frame maximum. The shunt trip on the left side operates on 208-277 V AC or 220-250 V DC. This is a remote-trip accessory for emergency-stop circuits or supervisory control. Both are factory-installed, so no field wiring into the breaker mechanism is needed.