SENTRON 3VA2125-8JP36-0AA0 — 25 A MCCB with ETU550 Trip Unit
The Siemens SENTRON 3VA2125-8JP36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, built around the ETU550 electronic trip unit. It's designed for line protection in distribution panels and motor control centers, with a rated insulation voltage of 800 V. Interrupting capacity is substantial: 440 kA at 240 V, 330 kA at 415 V, and still 52.5 kA at 690 V. That kind of headroom means it handles high-fault scenarios without cascading upstream — useful for main or tie breakers in industrial switchboards where the available fault current is high. The ETU550 is an electronic trip unit offering adjustable overload and short-circuit protection curves, plus communication capability for integration into a monitoring system. No undervoltage release or ground-fault monitoring is built in, so those functions need external modules if required.
Panel Fit and Mounting
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures. The front face carries an IP40 protection rating, suitable for enclosed distribution boards where tools are needed to access live parts. Operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C. The 25 A rating holds flat across the full operating range — no derating needed up to 70 °C ambient. Max power loss is 0.5 W per pole, which keeps heat buildup low in a dense panel.