What this MCCB brings to the panel
The Siemens SENTRON 3VA2125-8KP36-0AA0 is a 3-pole molded case circuit breaker rated for 25 A continuous current, built around the ETU850 electronic trip unit. That trip unit gives you adjustable overload and short-circuit protection curves, plus communication capability — so this breaker can report status and trip events back to a control system without extra add-on modules. The 330 kA breaking capacity at 415 V means it can safely interrupt very high fault currents on a 400 V industrial distribution board, keeping upstream switchgear out of the fault-clearing path.
Breaking capacity — what the numbers mean for coordination
The 3VA2125-8KP36-0AA0 delivers 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. That 330 kA at 415 V is the figure most panel designers will size against for a 400 V line-side fault. With that headroom, you can typically coordinate this MCCB downstream of a larger feeder breaker without needing a current-limiting upstream device — it handles the full fault current itself. The 52.5 kA at 690 V still covers most 690 V industrial grids, though at that voltage the available fault current is usually lower anyway.
Active production — no obsolescence concern
This order code carries a current lifecycle status from Siemens. No phase-out notice, no last-time-buy window to track. The ETU850 trip unit and communication function are current-generation features.
Panel fit — dimensions and mounting
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — it fits the same panel cutout and busbar spacing as other 3VA2 breakers in the same current class. The IP40 rating on the front means it's protected against tools and wires >1 mm, which is standard for enclosed distribution boards; no special sealing needed inside a cabinet.
Environmental range and thermal performance
Rated for operation from -25 °C to 70 °C ambient, with storage from -40 °C to 80 °C. The 25 A continuous rating holds across the full operating range — no derating needed up to 70 °C, which simplifies panel thermal calculations. Maximum power loss is 0.5 W, negligible for enclosure heat budgeting.