63 A MCCB with shunt trip — what the ratings mean for your panel
The Siemens 3VA1163-3EF32-0KA0 is a SENTRON molded case circuit breaker (MCCB) rated for line-protection duty. Its 63 A continuous rating holds across 40 °C to 50 °C without derating, then steps down to 62 A at 55 °C and 58 A at 70 °C — useful to know if the breaker sits near other heat sources in a crowded enclosure. Breaking capacity is voltage-dependent: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V and 690 V. That 52.5 kA at 415 V gives solid SCCR headroom for most 400 V industrial distribution panels — you can coordinate downstream without worrying about the main tripping first on a moderate fault. The TM240 thermal-magnetic release handles overload and short-circuit protection in one unit — no electronic trip adjustments, which simplifies commissioning and spares stocking. The built-in shunt trip (STL) lets you remotely trip the breaker via a control signal, useful for emergency-stop circuits or interlocking with a safety relay.
Panel fit — dimensions and integration
Three-pole construction, 76.2 mm wide, 130 mm tall, 70 mm deep. The 70 mm depth is the dimension that matters when clearing a gland plate or backpanel — measure from the mounting surface to the deepest projection. It drops into a standard SENTRON 3VA panel footprint; no rewiring needed if replacing a same-frame 3VA breaker.
Compliance and documentation
Rated insulation voltage 800 V. Operating temperature range -25 °C to +70 °C; storage from -40 °C to +80 °C. Maximum power loss 17.3 W. No communication function, no ground-fault monitoring, no undervoltage release on this variant — it's a straight thermal-magnetic breaker with shunt trip for remote opening.