The Siemens SENTRON 3VA1112-5ED36-0AC0 is a 3-pole molded case circuit breaker rated 125 A continuous at 40 °C, with a TM210 thermal-magnetic overcurrent release and a line protection designation. It carries a 187 kA interrupting rating at 240 V and 121 kA at 415 V, making it a high-fault-current choice for main or feeder protection in industrial switchgear.
Interrupting ratings and thermal derating
At 240 V the breaker interrupts 187 kA; at 415 V it handles 121 kA, dropping to 76 kA at 440 V and 17 kA at 500 V and 690 V. That 187 kA figure means it can safely clear faults on high-capacity transformer secondaries without needing a current-limiting fuse upstream — a real advantage when coordinating a main breaker in a 2000 A switchboard. The continuous current rating holds 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. If the panel ambient runs above 50 °C, size the load at the derated figure, not the nameplate 125 A.
Construction and auxiliary contacts
The breaker ships with 2 HQ auxiliary switches built in — no separate add-on block needed for status feedback to a PLC or remote annunciator. The TM210 release is a fixed thermal-magnetic unit; there is no undervoltage release, no voltage-trip module, and no ground-fault monitoring on this variant. It is a straight line-protection device for pure overcurrent and short-circuit duty. Rated insulation voltage Ui is 800 V, and maximum power loss at rated current is 28.1 W — a number to factor into enclosure thermal calculations if the panel is tightly packed.
Physical fit and panel integration
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint — it drops into the same mounting cutout and bus-bar spacing as other SENTRON 3VA1 frames.