The Siemens SENTRON 3VA1112-3EF36-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a TM240 thermal-magnetic overcurrent release. It is designed for 125 A at 40 °C and delivers an interrupting capacity of 75.6 kA at 240 V AC — sufficient for high-fault branch circuits in industrial distribution panels.
Interrupting and continuous ratings
The interrupting curve drops with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That means the breaker holds full fault-clearing capability on 480 V delta or 400 V wye systems common in North American and European panels. Continuous current is flat at 125 A from 40 °C through 50 °C, then derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. For a panel running at 60 °C ambient, the usable rating is 120 A — a 4 % reduction that the panel designer should budget. Rated insulation voltage is 800 V, and maximum power loss is 28.1 W. The TM240 release is a fixed thermal-magnetic type — no interchangeable trip units, which simplifies spares but locks the rating.
Physical fit and auxiliary contacts
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width (3 in) is standard for a 3-pole MCCB in a SENTRON panelboard — it occupies one 3-pole space. Two built-in auxiliary switches (HP type) are included, so no separate add-on block is needed for status feedback to a PLC or annunciator.