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%. Factory-fitted accessories include a shunt trip on the left side, rated 208-277 V AC 50/60 Hz or 220-250 V DC, plus two auxiliary switch changeover contacts. This is a fully assembled line-protection breaker — order it, land it in the panel, terminate the bus.
Lifecycle and sourcing posture
We source this to order against an RFQ. Availability and current pricing are confirmed at quote time. If you are freezing a panel design or stocking a critical spare, this is a good time to secure your allocation.
What the ratings mean for the panel
The Icu=55kA at 415 V is the ultimate short-circuit breaking capacity — the breaker can safely interrupt a fault up to that level once and still be functional afterward. 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. The two auxiliary changeover switches provide status feedback to a PLC or indication panel. Both are factory-installed, so no field wiring into the breaker mechanism is needed.