What this MCCB carries — and where it fits
The Siemens 3VA1025-4ED32-0BA0 is a SENTRON 3-pole molded case circuit breaker rated for 25 A continuous current (Iu) with a TM210 thermal-magnetic overcurrent release. Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V, dropping to 52.5 kA at 440 V and 11.9 kA at 690 V. That means it can clear high-fault currents on a 240 V distribution bus without upstream coordination issues — the 121 kA figure is what drives the SCCR on a panel label. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems. This version is configured for line protection (no ground-fault monitoring, no communication module, no auxiliary contacts). It ships with an integrated undervoltage release (UVR) — the release design is a dedicated 3VA9608-0BB11 auxiliary trip unit. That UVR is a key detail for any panel where a loss-of-voltage condition must trip the breaker automatically, typical in safety circuits or motor-control centers with undervoltage protection schemes.
Thermal derating and panel integration
The 3VA1025 holds full 25 A rating up to 50 °C ambient. At 55 °C it derates to 24 A, at 60 °C to 23.5 A, and at 70 °C to 22.5 A. If this breaker lands in a crowded enclosure with other heat sources, plan your load at the derated value for the actual ambient — not the nameplate 25 A. Dimensions are 130 mm height, 76.2 mm width, 70 mm depth; the 76.2 mm width is a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount bases without re-drilling. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Front protection is IP40 — fine for a dry indoor panel, but not for washdown or outdoor exposure without an enclosure. Latching endurance is rated at 15 000 operations, which covers typical infrequent switching in a distribution board; not a cycled load-break device.