The Siemens 3VA2450-7MN32-0KA0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection. It carries a 500 A continuous rating from 40 °C up to 50 °C, then derates linearly to 480 A at 70 °C — the full thermal curve is in the spec table, so if your panel ambient runs above 50 °C, that 495 A at 55 °C or 490 A at 60 °C is the number to use for sizing. Breaking capacity is 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 15.3 kA at 690 V. That 15.3 kA at 690 V is the limiting figure for high-voltage industrial feeds — if your system fault current exceeds that at 690 V, you need a current-limiting upstream device or a different frame. This MCCB includes phase failure detection and a shunt trip release (STL). The shunt trip allows remote tripping from a safety relay or PLC output, which is standard for motor control centers where you need an E-stop to drop the breaker without a manual walk.
Integration & Mounting
Dimensions are 138 mm wide, 248 mm high, 110 mm deep — a standard 3-pole MCCB footprint for panel mounting. The basic switch variant is 3VA2450-7MN32-0AA0; this order code adds the shunt trip release. No auxiliary switch is included, so if you need a status contact for the PLC, you'll add one separately.