The Siemens 3VA2110-5MN32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for motor protection duty. It carries a solid 100 A continuous current all the way up to 70 °C ambient — no derating curve to watch there, which simplifies panel design in warm enclosures. Three-pole, with a shunt trip release (STL) and a built-in 2-aux + 1 trip alarm switch block.
Interrupting ratings — what they mean for the panel
This breaker delivers 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. At typical 480 V industrial feeds (between the 440 V and 500 V entries) you're looking at well over 75 kA of interrupting capacity — that's serious headroom for high-fault panels. The steep drop to 3.7 kA at 690 V is expected: 3-pole breakers on a 690 V line see each pole across a higher voltage, and the arc extinction gets harder. If your site runs 690 V, verify the available fault current stays under that 3.7 kA.
Motor protection features and auxiliary wiring
Designed as a motor protection circuit breaker, the 3VA2110-5MN32-0KH0 includes phase failure detection — a must for three-phase motor circuits where a lost phase can burn a winding before the overload relay catches it. The shunt trip (STL) lets you remotely trip the breaker from a PLC or E-stop circuit; the auxiliary switch block (2 form-C contacts + 1 trip alarm) gives status feedback for the control system. No undervoltage release on this variant, so if you need UVR for safe-start sequencing, this isn't the order code. No ground-fault monitoring either — that's a separate variant.
Physical fit and panel integration
Dimensions: 181 mm high, 105 mm wide, 86 mm deep. That 86 mm depth is the key number for enclosure selection — it's the projection from the mounting surface to the front of the breaker, including the handle and aux switch wiring. The supplied basic switch is order code 3VA21105MN320AA0, which is the internal switching mechanism; the full assembly ships as the 3VA2110-5MN32-0KH0. Panel builders: the 105 mm width matches the standard SENTRON 3VA2 three-pole footprint, so it drops into existing busbar and DIN-rail layouts without re-drilling.
Maximum power loss is 10 W — low enough that it won't drive internal enclosure temperature up significantly, but if you're packing multiple breakers in a small panel, sum the losses for thermal calculations. Operating temperature range: -25 °C to 70 °C; storage from -40 °C to 80 °C.