The Siemens SENTRON 3VA2450-5MN32-0CH0 is a 3-pole molded case circuit breaker rated for motor protection duty. It carries a continuous current of 500 A at 40 °C, with minor thermal derating up to 70 °C (480 A). The interrupting capacity reaches 187 kA at 240 V, stepping down to 121 kA at 415/440 V and 75.6 kA at 500 V — at 690 V it still holds 9 kA. That's enough headroom for most industrial distribution panels feeding motor control centers.
What the built-in components mean for a panel swap
This breaker ships with an undervoltage release (UVR), two auxiliary switches, and one trip alarm switch (HQ) already installed. That means no extra wiring for a shunt trip or aux contact block — the UVR drops the breaker if control voltage fails, and the alarm switch signals a trip condition back to the PLC or annunciator. Phase failure detection is also built in, so it catches a lost phase before the motor cooks. The auxiliary release is a UVR, not a shunt trip — if your circuit needs a remote trip from a pushbutton or safety relay, you'd add a shunt trip separately.
Physical fit and panel integration
Dimensions are 248 mm tall, 138 mm wide, 110 mm deep. That's a standard 3-pole MCCB footprint for this current class — mounts on a DIN rail or bolted directly to the backplate. Power dissipation is 101.5 W maximum, so factor that into enclosure cooling if the panel is densely packed. Storage range is -40 °C to 80 °C; operating ambient -25 °C to 70 °C.