What this MCCB carries and where it fits
The Siemens SENTRON 3VA2163-5MN32-0DH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed specifically for motor protection, with integrated phase failure detection and a trip indicator. The interrupting capacity reaches 187 kA at 240 V, 121 kA at 415/440 V, and 75.6 kA at 500 V, dropping to 3.7 kA at 690 V. That 187 kA figure at 240 V means it can safely clear a fault on a high-capacity transformer secondary without upstream fuses needing to coordinate — a real advantage in industrial distribution panels where available fault current runs high. This breaker ships with an undervoltage release (UVR) as the auxiliary release, plus two auxiliary switches and one trip alarm switch. The UVR drops the breaker when control voltage falls below a threshold — standard for motor circuits that must not auto-restart after a power dip. The auxiliary switch configuration (2 aux + 1 trip alarm) gives the PLC or safety relay a clean status signal for both the breaker position and the trip event, without needing an external interlock block.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep. The 105 mm width is a standard 3-pole MCCB footprint for this class — it occupies three 35 mm DIN-rail spaces or a direct panel-mount cutout. The 86 mm depth leaves clearance behind a 200 mm deep enclosure door, even with wiring gutters. The basic switch order code is 3VA21635MN320AA0, which is the internal switching core; the full assembly includes the UVR and auxiliary switch pack as a factory-integrated unit.
Power loss and thermal management
Maximum power loss is 6.5 W at rated load. In a sealed enclosure with multiple breakers ganged together, that 6.5 W per pole stack matters — a panel with six of these breakers at full load dissipates 39 W, which may drive a small ventilation slot or a larger enclosure volume to keep internal ambient below the 70 °C operating maximum.