Siemens 3VA1225-5EF42-0AA0 — 250 A SENTRON MCCB, 4-Pole, TM240 Release
The Siemens 3VA1225-5EF42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. It is a 4-pole unit designed for line protection in distribution panels and industrial switchboards. Breaking capacity is specified per voltage: 187 kA at 240 V AC, 121 kA at 415 V AC, 75.6 kA at 440 V AC, 30 kA at 500 V AC, and 17 kA at 690 V AC. These figures represent the maximum prospective short-circuit current the breaker can safely interrupt at each voltage level — critical for coordination studies and SCCR compliance in the panel. Continuous current rating holds at 250 A from 40 °C through 50 °C ambient, then derates linearly to 223 A at 70 °C. The TM240 release is fixed-trip, not adjustable; the breaker's minimum breaking capacity is 1 250 A. Insulation voltage is rated 800 V. Dimensions are 70 mm depth, 140 mm width, 158 mm height. Maximum power loss is 57 W. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Installation and Panel Fit
The 140 mm width and 70 mm depth fit standard MCCB mounting footprints in distribution panels and switchboards. No undervoltage release, voltage trigger, or communication function is integrated — this is a standalone line-protection breaker. Ground-fault monitoring is not included.