The Siemens SENTRON 3VA2110-5MN32-0BL0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It's the motor protection variant, fitted with an ETU350M electronic trip unit, so it's set up for overload and phase-failure protection on motor loads right out of the box.
Breaking capacity and fault clearing
This MCCB delivers 187 kA breaking capacity at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA figure at 240 V means it can safely interrupt very high fault currents common on the secondary side of large distribution transformers — useful for main or feeder duty in industrial panels where available fault current is high. The steep drop at 690 V (3.7 kA) is typical for a 100 A frame; at that voltage the limitation is arc extinction, not thermal capacity.
Motor protection design
The motor protection variant includes phase failure detection and an undervoltage release as standard, so it will trip on loss of phase or significant voltage sag — both conditions that damage motor windings. The ETU350M release is an electronic trip unit, meaning it offers adjustable overload curves and better accuracy than a thermal-magnetic breaker, especially in warm panels where ambient compensation matters. The auxiliary contact complement — 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ) — gives the PLC or SCADA system status feedback on breaker position and fault events without extra add-on modules.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width for a 3-pole 100 A MCCB is standard for the SENTRON 3VA frame — it occupies three 35 mm DIN-rail modules, so it fits a standard 600 mm wide enclosure with room for side-mounted accessories. The 86 mm depth leaves clearance for rear-connected busbars or cable ducts behind the DIN rail.