What this MCCB is and where it lands
The Siemens 3VA1110-5GF46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous at 40 °C, with a 4-pole configuration and a TM240 thermal-magnetic overcurrent release. It's designed for line protection — meaning it sits at the feeder or main distribution point, not downstream on a motor or branch circuit. The interrupting ratings climb to 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V, so it handles high-fault utility feeds without cascading upstream. At 690 V it still interrupts 17 kA, which covers most industrial service-entrance scenarios.
Thermal-magnetic trip and derating
The TM240 release means the thermal element is calibrated for a 240 A frame — the breaker itself is a 100 A continuous rating, so you get the mechanical robustness of the larger frame with the lower trip setting. That matters when you need high interrupting capacity in a 100 A feeder. The continuous current holds at 100 A through 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your panel ambient runs hot, you lose about 9 % at the top end. The 25 W maximum power loss at rated load gives you a number for enclosure thermal calculations.
Footprint and panel fit
This MCCB measures 130 mm high, 101.6 mm wide, and 70 mm deep. It's a DIN-rail mount — snaps onto standard 35 mm rail. The 4-pole width (101.6 mm) is four modular units at 25.4 mm per pole, so it fills four slots on the rail. Front face is IP40, which means it's protected against tools and wires >1 mm but not against water ingress — keep it inside a closed panel. No undervoltage release, no communication function, no trip indicator on this variant. It's a straight line-protection breaker with a thermal-magnetic trip and no accessories.
Lifecycle and sourcing reality
The manufacturer lists this part as current production — no phase-out, no last-time-buy notice. That means it's still a standard catalog item, not a surplus or end-of-life scavenge. For a BOM line that needs a 100 A, 4-pole MCCB with high interrupting capacity, this is a clean spec-in. The SENTRON 3VA series is Siemens' current-generation molded case breaker line, so replacement parts and accessories (auxiliary contacts, shunt trips, rotary handles) are all active. Sourced and quoted to order against an RFQ through independent distribution.