What this MCCB does and the ratings that matter
The Siemens SENTRON 3VA2010-6HN32-0AH0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection — meaning it sits at the feeder or main distribution point, not on a motor branch. Its rated continuous current is 100 A across the full ambient range from 40 °C to 70 °C, so you don't have to derate it when the panel runs warm. The frame rating is 1200 A, which tells you the physical breaker shell and bus system are sized for that maximum, but the trip unit inside is set for 100 A. Breaking capacity is the headline number here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. That 242 kA figure means it can safely interrupt a fault current up to 242,000 amps at 240 V without the arc flashing over or the case rupturing — critical for high-fault installations near large transformers or utility feeds. Rated insulation voltage is 800 V, so the internal clearances and creepage distances are designed for 600 V class systems and some 690 V applications, though the breaking capacity at 690 V drops to 3 kA — that's a limitation to watch if you're on a 690 V network. The operating temperature range is -25 °C to 70 °C, and storage from -40 °C to 80 °C. Power loss at rated current is 13.5 W, which is modest for a 100 A MCCB and won't drive much heat into a panel.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep. That 105 mm width is a standard 3-pole MCCB footprint for this frame class — it will fit existing Siemens 3VA mounting plates and busbar adapters. The 86 mm depth includes the arc chute cover and terminals; make sure your enclosure has at least 100 mm clearance in front for the breaker to swing open during maintenance. Panel builders should note that this breaker ships with a trip indicator so you can see at a glance whether it tripped on fault versus being manually switched off.
Auxiliary switching and accessories
This variant comes with 2 auxiliary switches plus 1 trip alarm switch (HQ type) factory-installed. That means you get two form-C contacts for status feedback (open/closed) and one dedicated contact that changes state only when the breaker trips on overcurrent or short circuit — useful for remote alarm annunciation. There's no undervoltage release and no communication module on this order code, so if you need shunt trip or Modbus, you'll be adding those as field-installable accessories. The supplied basic switch is 3VA20106HN320AA0, which is the internal switching mechanism.