What this MCCB brings to a motor branch circuit
The Siemens SENTRON 3VA2163-7MN32-0JL0 is a 3-pole molded case circuit breaker rated 63 A continuously across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Designed specifically for motor protection, it includes phase failure detection so a single lost phase trips the breaker before single-phasing damages the winding. Breaking capacity runs 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA figure at 240 V gives headroom for high-fault utility or transformer-fed panels where available fault current is substantial.
Built-in auxiliary and trip signalling
This variant ships with a factory-fitted auxiliary switch block (2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ) and a shunt trip release (STL). The auxiliary switches give the PLC or SCADA a dry-contact status of the breaker position; the trip alarm and electrical alarm switches report fault and electrical trip events separately. The shunt trip lets a remote signal — emergency stop, fire alarm, or undervoltage relay — force the breaker open. The basic switch core is order code 3VA2163-7MN32-0AA0, meaning the auxiliary and release assemblies are integrated at the factory rather than field-added. Panel builders avoid the extra wiring step of snap-on accessory modules.
Environmental and installation limits
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss at rated load is 4 W. Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without rework.