Siemens 3VA2450-7MN32-0BC0 — 500 A MCCB for Motor Protection
It carries a maximum interrupting capacity of 330 kA at 240 V, 242 kA at 415 V, and 187 kA at 500 V — figures that give you headroom for high-fault installations like large motor feeders or transformer secondaries.
Thermal Derating and Power Loss
The 500 A rating holds flat from 40 °C up to 50 °C, then derates linearly: 495 A at 55 °C, 490 A at 60 °C, 485 A at 65 °C, and 480 A at 70 °C. Maximum power loss is 101.5 W. For a panel builder, that means the breaker can sit in a warm enclosure without losing much capacity, but the 101.5 W dissipation needs to be factored into the enclosure's thermal budget — especially if the breaker is grouped with other high-current devices.
The 110 mm depth leaves clearance for rear-connected busbars or cable lugs in a typical switchboard.
Built-in Auxiliary and Release Options
This variant ships with two auxiliary switches (HQ type) and an undervoltage release (UVR) factory-installed. The auxiliary switches can be wired into a PLC or status indication circuit. No communication function is included; this is a standalone protection device.