125 A MCCB with 187 kA SCCR — line protection for high-fault panels
The Siemens 3VA1112-5EF36-0JH0 is a 3-pole SENTRON molded case circuit breaker rated for 125 A continuous at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V. That SCCR figure drops to 121 kA at 415 V and 75.6 kA at 440 V, so the breaker handles high-fault-current distribution panels where upstream transformer capacity is substantial. The 800 V rated insulation voltage confirms it is built for 690 V line-to-line systems with margin. Designed for line protection, this MCCB carries a shunt trip release (STL) as the auxiliary release and includes 2 auxiliary switches plus 1 trip alarm switch HQ. The trip indicator and voltage trigger are both present, giving the commissioning engineer clear visual and electrical status feedback without opening the panel. Thermal derating is modest: the breaker holds 125 A up to 50 °C, then drops 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 OEM wireman, this means the full 125 A rating is usable in most ventilated enclosures without oversizing the frame.
Lifecycle and sourcing posture
Maximum power loss is 28.1 W, which factors into panel thermal budgeting. The operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C.
Integration and mounting
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. It mounts on a DIN rail or panel-mount baseplate in the standard SENTRON 3VA footprint. The 3-pole width at 76.2 mm (3 inches) matches the typical 25 mm per-pole spacing common in North American and European panelboards.