What this MCCB carries — and what it means for your panel
The Siemens SENTRON 3VA1110-6FE42-0AA0 is a 4-pole molded case circuit breaker rated for 100 A continuous current at 40 °C, with a TM220 thermal-magnetic overcurrent release. The 220 kA interrupting capacity at 240 V means this breaker can safely clear a fault up to that level without upstream devices needing to trip — a key figure for high-fault panels where selectivity and SCCR headroom are the design constraints. At 415 V it still interrupts 154 kA, and at 690 V it holds 17 kA, so the part covers both 400 V and 690 V distribution tiers within the same frame. Rated insulation voltage is 800 V, and the maximum power loss sits at 25 W — relevant for thermal budgeting inside a sealed enclosure. The front face carries IP40 protection, so it's suited for panel-mount indoor use where tool access is controlled rather than washdown environments.
Thermal derating and ambient range
The breaker carries its full 100 A rating from 40 °C through 50 °C. Above that it derates linearly: 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 above 50 °C, size the load circuit against the derated value rather than the nameplate 100 A. Operating ambient spans -40 °C to 70 °C, storage from -40 °C to 80 °C.
Physical fit and mounting
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth. The 4-pole width (101.6 mm) is the standard 4-module footprint for SENTRON 3VA frames — it occupies the same panel cutout as other 4-pole 3VA breakers. Depth at 70 mm is shallow enough for most 200 mm deep enclosures; verify clearance for the handle throw and rear terminals.
Release design and protection profile
The TM220 overcurrent release is a thermal-magnetic type — the thermal element handles overload protection (inverse-time), the magnetic element handles short-circuit (instantaneous). This is a line-protection variant, meaning it's configured for cable and busbar protection rather than motor or generator protection. The N-conductor protection is set to 50% of the phase rating, standard for 4-pole distribution.