What this 100 A MCCB delivers — and what the ratings mean for your panel
The Siemens SENTRON 3VA1110-5EF42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated 100 A continuous at 40 °C with a TM240 thermal-magnetic release. The 187 kA breaking capacity at 240 V AC tells you this breaker can safely interrupt a bolted fault up to that level without welding contacts or venting arc plasma into the enclosure — critical for high-fault installations like transformer secondaries or large motor control centers. At 415 V the interrupting rating drops to 121 kA, and at 690 V it holds at 17 kA, so selectivity studies need to use the voltage-specific value, not the headline number. The 4-pole design covers three-phase plus neutral switching, which matters for TN-S or TN-C-S systems where the neutral must be isolated on fault clearing. Rated insulation voltage is 800 V, giving headroom for 690 V line-to-line systems.
Panel fit and mounting — dimensions and integration
The 3VA1110-5EF42-0AA0 measures 130 mm high, 101.6 mm wide, and 70 mm deep. The 101.6 mm width (4 inches) is the standard 4-pole MCCB footprint in the SENTRON 3VA platform, so it occupies the same DIN-rail or screw-mount space as other 4-pole 3VA frames. Depth of 70 mm (2.76 in) leaves enough clearance for rear-connection busbars or plug-in adapters in a typical 600 mm deep enclosure. Front IP40 protection means the breaker is splash-proof from the front but not sealed; install it in a panel with an IP54 or better door if washdown is present.