Siemens 3VA1125-6EF32-0AE0 — SENTRON MCCB, 25 A, 220 kA IC at 240 V
The Siemens 3VA1125-6EF32-0AE0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a rated current of 25 A at 40 °C, with a thermal-magnetic TM240 overcurrent release. The interrupting capacity reaches 220 kA at 240 V AC, 154 kA at 415 V, and 121 kA at 440 V — figures that place it in the high-breaking-capacity class for fault-current duty downstream of large transformers or in high-fault industrial grids. Rated insulation voltage is 800 V, and the breaker dissipates 8.5 W maximum under load. Operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C. The 3-pole unit measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint for DIN-rail or panel-mount integration.
Breaking capacity and thermal derating
The 220 kA at 240 V is the headline interrupting rating; at 500 V and 690 V it still holds 17 kA, which covers most motor-control and distribution applications at those voltages. The thermal derating is tight: the breaker holds 25 A from 40 °C through 50 °C, drops to 24 A at 55 °C and 60 °C, and to 23 A at 65 °C and 70 °C. That means in a warm enclosure — say 55 °C ambient — you lose only 1 A of headroom, so the 25 A frame is still usable for a 24 A continuous load without upsizing.
Feature set and internal configuration
This variant omits undervoltage release, voltage trip, ground-fault monitoring, and communication functions — it is a straight thermal-magnetic line-protection breaker. The supplied basic switch is order code 3VA11256EF320AA0, and the auxiliary switch block is configured for 4 HQ auxiliary switches. No trip indicator is fitted. For a panel where remote signaling or ground-fault detection is required, a different 3VA variant with those options would be needed.