What it is — and what the ratings mean for fit
The Siemens 3VA1110-3EF36-0JC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Its headline rating is 100 A at 40 °C, meaning it carries that load continuously without tripping at typical panel ambient — and it holds that same 100 A rating through 50 °C, so no derating is needed for most indoor switchgear rooms; only above 55 °C does it start to step down, reaching 91 A at 70 °C. The interrupting capacity is 75.6 kA at 240 V, dropping to 52.5 kA at 415 V and 32 kA at 440 V — sufficient for high-fault industrial services where fault current can exceed 50 kA. At 500 V and 690 V it still clears 11.9 kA, covering most motor-control center applications. This 3-pole MCCB ships with a shunt trip (STL) release and two auxiliary switches HQ built in — the shunt trip allows remote tripping from an emergency-stop circuit or PLC output, while the HQ aux switches provide status feedback to the control system. Insulation voltage is rated 800 V, adequate for 690 V line-to-line systems.
Lifecycle and sourcing reality
The lifecycle stage is marked current — meaning Siemens still actively manufactures and supports this order code. There is no announced phase-out or last-time-buy window. For a BOM freeze or MRO spare, this part is a standard catalog line, not a sunset item that requires obsolescence planning.
Panel integration — what fits where
The MCCB measures 70 mm deep, 76.2 mm wide, and 130 mm tall — a standard 3-pole MCCB footprint that drops into most SENTRON distribution panels and switchgear cubicles without re-drilling. The 76.2 mm width (3 inches) matches the standard 3-pole MCCB module pitch on DIN-rail or bolt-on mounting plates. Maximum power loss is 25 W — account for this in thermal calculations for enclosed panels, especially when multiple breakers are ganged. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.
How it compares to the 3VA1110-5ED36-0AC0
The closest functional peer is the 3VA1110-5ED36-0AC0. Both are 3-pole SENTRON MCCBs with the same frame size and 100 A thermal rating. The -3EF36-0JC0 includes a shunt trip and two HQ aux switches as standard. Footprint is identical — 70 mm deep, 76.2 mm wide.