Siemens 3VA1225-5EF42-0AE0 — SENTRON 250 A MCCB, 4-Pole, TM240
The Siemens 3VA1225-5EF42-0AE0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection, rated 250 A at 40 °C with a 4-pole configuration and a TM240 thermal-magnetic overcurrent release. Breaking capacity reaches 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — high enough for most industrial main-feed and distribution applications where fault currents are substantial. The 250 A rating holds from 40 °C through 50 °C, then derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C — useful when the breaker sits in a warm enclosure or near other heat sources. Rated insulation voltage is 800 V, and maximum power loss is 57 W. Operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C.
Panel Fit and Integration
Dimensions are 158 mm high, 140 mm wide, and 70 mm deep — a standard 4-pole MCCB footprint that fits most distribution panelboards and switchgear cubicles without re-drilling the mounting plate. The supplied basic switch is order code 3VA12255EF420AA0, and the auxiliary switch design accommodates 4 auxiliary switches (HQ type) for status feedback to a PLC or SCADA system. No undervoltage release, no ground-fault monitoring, no communication function, and no voltage trigger are included on this variant — it is a straight thermal-magnetic line-protection breaker, no frills.