Siemens 3VM1125-5EE32-0AA0 — SENTRON MCCB, 25 A, 187 kA SCCR
The Siemens 3VM1125-5EE32-0AA0 is a SENTRON molded case circuit breaker (MCCB) for line protection, carrying a 25 A continuous rating at 40 °C and a TM220 thermal-magnetic trip unit. It's a 3-pole frame with a 187 kA interrupting capacity at 240 V AC, stepping down to 121 kA at 415 V and 76 kA at 440 V — numbers that tell you this breaker is built for high-fault utility or transformer-fed panels where the available short-circuit current is significant. Rated operational voltage is 690 V AC, with a DC rating of 500 V. Insulation voltage is 800 V, so the internal clearances are sized for 600 V class gear. Front protection is IP40 — fine for a dry indoor panel, but not for washdown zones.
Current derating and thermal limits
The 25 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 24 A, and at 70 °C it's 23 A. That's a shallow slope — the breaker doesn't shed much capacity until you're well above typical panel ambient. Maximum power loss is 9 W, which is modest for a 3-pole 25 A frame. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limits govern handling and warehousing, not running conditions.
Physical fit and panel integration
The 3VM1125-5EE32-0AA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. That's a standard 3-pole MCCB footprint for a 25 A frame — it'll drop into most panel layouts without re-drilling the backplate. No undervoltage release, no voltage trigger, no communication module, no ground-fault monitoring on this variant; it's a straight thermal-magnetic line-protection breaker. No trip indicator on the front, so you'll need to read the handle position or wire an auxiliary contact separately if remote status is required.