What it is and what it does
The Siemens 3VA2110-5MN36-0JH0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection. It carries a continuous current rating of 100 A across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel design in warm enclosures. Three poles, rated for 121 kA interrupting capacity at 415 V and 187 kA at 240 V. That puts it in the high-fault tier for a 100 A frame — suitable for secondary distribution downstream of a large transformer or feeding a motor control center with high available fault current. The motor protection design means the trip curve is shaped for overload and phase-loss conditions common to induction motors. Phase failure detection is built in — it will trip on a lost phase, protecting the motor from single-phasing. No undervoltage release on this variant.
Auxiliary and release configuration
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch HQ, and a shunt trip release (STL). The shunt trip allows remote tripping via a control signal — useful for emergency-stop circuits or interlocking with upstream protection. The auxiliary switches provide status feedback (open/closed/tripped) to a PLC or indication panel. No communication function on this variant — it's a standalone breaker, not a metering or networked unit. If you need remote monitoring beyond the aux contacts, you'd add an external I/O module.
Panel fit and environment
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. That's a standard SENTRON 3VA2 frame footprint — same width as the 160 A and 250 A frames in the same series, so busbar and mounting hole patterns carry across if you upsize later. Depth of 86 mm means it clears most 200 mm deep enclosures with room for wiring gutters. Operates from -25 °C to 70 °C ambient, storage from -40 °C to 80 °C. Maximum power loss is 10 W — negligible for enclosure heating calculations, but worth noting if you pack multiple breakers in a small sealed box.