The Siemens 3VA1110-3ED42-0AA0 is a SENTRON molded case circuit breaker (MCCB) sized for 100 A continuous at 40 °C, with a TM210 thermal-magnetic release that handles both overload and short-circuit protection in one unit. Four poles make it a straight fit for three-phase-plus-neutral or dual-fed DC circuits where the neutral needs switching. Breaking capacity runs 75.6 kA at 240 V AC and still holds 52.5 kA at 415 V — enough for high-fault industrial panels without cascading upstream breakers.
Ratings and what they mean for fit
The 100 A rating at 40 °C is the headline number, but the derating curve matters when the panel runs hot: at 55 °C it still carries 98 A, at 70 °C it drops to 91 A. If the enclosure sits near a heat source or in a crowded cabinet, use the 70 °C figure for sizing. Breaking capacity of 75.6 kA at 240 V AC and 52.5 kA at 415 V AC means this MCCB can interrupt fault currents up to those levels without welding contacts or rupturing the case. For a 415 V line with a prospective short-circuit current of 40 kA, the 52.5 kA rating gives a comfortable margin — no need for a current-limiting fuse upstream. The TM210 release is a fixed thermal-magnetic type — not adjustable for short-circuit pickup. That keeps commissioning simple but means the breaker is matched to a specific cable/load impedance at the factory. If the load changes significantly, swap the breaker rather than trying to re-tune it. IP40 on the front means the breaker face is protected against tools and wires over 1 mm, but not sealed against dust ingress. Fine for a clean indoor panel; skip it for washdown or outdoor enclosures unless it's behind a sealed door.
Where it goes in a panel
The 3VA1110-3ED42-0AA0 mounts on a DIN rail or directly to a backplate via the standard 4-pole MCCB footprint. At 70 mm deep, 101.6 mm wide, and 130 mm tall, it fits in a standard distribution board or motor control center cubicle. The 4-pole width means it occupies four module spaces on a DIN rail — plan the gland plate and wireway accordingly.