Siemens 3VA2125-0MS36-0AA0 — SENTRON MCCB for Motor Protection
The Siemens 3VA2125-0MS36-0AA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection, with a continuous current rating of 25 A and an ETU310M electronic overcurrent release. The ETU310M provides adjustable thermal-magnetic or electronic trip characteristics tailored to motor starting curves, avoiding nuisance tripping on inrush while protecting against overloads and short circuits. Its breaking capacity is rated at 440 kA at 415 V AC and 187 kA at 690 V AC — figures that place it in the high-interrupting category for industrial distribution. Rated insulation voltage is 800 V, and the operating voltage at AC is 690 V, so it suits 400 V and 690 V line-to-line systems common in European and North American industrial plants.
Integration Notes — Panel Fit and Derating
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA2 frame size that fits Siemens panelboards and most DIN-rail enclosures with the appropriate mounting adapter. The continuous current rating holds at 25 A across the full ambient range from 40 °C to 70 °C — no derating needed for elevated panel temperatures up to that limit. Maximum power loss is 0.5 W, negligible for thermal budgeting. If any of those are required for the application, they must be added via external modules or a different 3VA2 variant.