The Siemens 3VA1125-6EF32-0CC0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 25 A and a TM240 thermal-magnetic overcurrent release. Its interrupting capacity hits 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — numbers that tell you this breaker is built for high-fault-current panels where upstream coordination demands serious SCCR headroom. At 690 V it still clears 17 kA, which is useful for industrial drives fed from a 690 V distribution bus.
Ratings and what they mean for fit
The 25 A rating holds flat from 40 °C through 50 °C, then derates to 24 A at 55 °C, 23.5 A at 60 °C, 23 A at 65 °C, and 22.5 A at 70 °C. That's a shallow derate curve — you can run this breaker near its nameplate in a warm enclosure without losing much headroom. The rated insulation voltage Ui is 800 V, so it's comfortable on 480/277 V and 600 V systems with margin to spare. Mechanical endurance is rated at 15,000 operations — typical for an MCCB in a panel that sees occasional switching, not daily cycling. The auxiliary contact version is 2 auxiliary switches HQ, which gives you two form-C contacts for status feedback to a PLC or indication lamp.
Built-in undervoltage release
This order code includes an undervoltage release (UVR) as standard — the design of the auxiliary release is an undervoltage release (UVR), and the integrated auxiliary trip is listed as 3VA9608-0BB24. That means the breaker trips automatically if the control voltage drops below a set threshold, which is a common requirement for motor feeder circuits where you need to prevent automatic restart after a voltage dip. No separate UVR module to buy and mount.
Panel fit and environment
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that fits SENTRON distribution panels and most DIN-rail-mount enclosures. Front protection is IP40, meaning tools and fingers stay out but it's not sealed against hose-down; keep it inside a cabinet. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.