What it is and what it does
The Siemens 3VA2010-5KP32-0AJ0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current, 3-pole, designed for line protection in distribution panels and motor control centers. It's built to handle fault currents up to 187 kA at 240 VAC — that's the interrupting capacity, meaning it can safely clear a bolted fault at that voltage without welding contacts or venting plasma into the enclosure. At 415 V and 440 V it still holds 121 kA, dropping to 75.6 kA at 500 V and 3 kA at 690 V, which covers most industrial low-voltage systems. The 800 V rated insulation voltage gives headroom for 480/277 V or 600 V delta systems.
Key ratings and what they mean for the panel
Continuous current holds flat at 100 A from 40 °C all the way up to 70 °C ambient — no derating curve to calculate for elevated panel temps. That's a solid spec for a warm MCC bucket or a crowded switchboard. The 3-pole configuration handles three-phase loads; the line protection design means it's set up for cable and busbar protection, not motor overload — pair it with a separate overload relay if feeding a motor directly. Communication function is onboard, so it can talk to a BMS or SCADA system for trip status and load monitoring without an add-on module. Auxiliary switch configuration includes 2 auxiliary switches plus 1 trip alarm switch (HP type) — enough for remote status indication and a separate alarm on fault trip.
Where it fits and how it mounts
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — a standard MCCB footprint that drops into most Siemens SENTRON panelboards and third-party enclosures with a 3-pole cutout. Operating temperature range from -25 °C to 70 °C covers unheated warehouses and hot machine rooms. Storage range from -40 °C to 80 °C means it can sit in a cold van overnight or a hot shipping container without damage. Power loss is 13.5 W maximum at rated current — negligible for panel ventilation calculations, but worth noting if you're packing a dozen of these in a sealed box.
What the spec table doesn't tell you
The trip indicator is present — a mechanical flag or window that shows the breaker has tripped, even if the handle is reset. No undervoltage release and no ground-fault monitoring on this variant, so if you need UVR or GF protection, you're looking at a different suffix. The supplied basic switch is order code 3VA20105KP320AA0 — that's the internal switching mechanism; not something you'd replace in the field, but it confirms the breaker is a complete, factory-assembled unit, not a kit.