The Siemens SENTRON 3VA1010-4ED32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries 100 A continuously at 40 °C, derating to 91 A at 70 °C — so if this breaker lands in a warm panel or next to other heat sources, that top-end ambient is the number that governs your load margin.
Interrupting capacity and what it means for your panel
This MCCB delivers 121 kA at 240 V, 75.6 kA at 415 V, and still holds 11.9 kA at 690 V. That 121 kA figure at 240 V is the headline number for North American panels with high available fault current — it tells you the breaker can safely clear a bolted fault without welding its contacts or rupturing the case, which is the difference between a coordinated trip and a cascade failure upstream. Rated insulation voltage is 800 V, so it's comfortable on 480/277 V or 600 V systems with headroom to spare — the insulation isn't the limiting factor here. Power loss at full load is 27.5 W maximum. That's not trivial in a sealed enclosure — factor it into your thermal budget if the panel is tight on ventilation.
Built-in auxiliaries and releases
This variant ships with an undervoltage release (UVR) and a complement of 2 auxiliary switches plus 1 trip alarm switch (HQ). The UVR means the breaker drops out when control voltage falls below a threshold — useful for safety circuits or sequenced start-up where you want the main breaker to follow the control power state. The trip alarm switch gives a positive signal that the breaker has opened on fault, not just been switched off manually.
Physical fit and panel integration
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — standard 3-pole MCCB envelope for this class. The 70 mm depth is shallow enough that it clears most 200 mm-deep enclosures with room for wiring gutters behind it. Mounting is screw-fixed to the back panel or DIN rail adapter (not included in this order code).