The Siemens SENTRON 3VM1110-5GE42-0AA0 is a 4-pole molded case circuit breaker rated for 100 A continuous at 40 °C through 50 °C, derating to 91 A at 70 °C. That 100 A frame handles line protection duty with a TM220 thermal-magnetic release — fixed thermal and magnetic trip elements, no adjustment knobs, so what you order is what protects the feeder. The interrupting ratings are the headline here: 187 kA at 240 V AC, 121 kA at 415 V AC, 76 kA at 440 V AC, and 17 kA at 500 V AC. That's high-end interrupting capacity for a 100 A MCCB; you're buying fault-current headroom that keeps selectivity with the transformer main. The 4-pole design covers three-phase plus neutral, and the N-conductor protection is rated at 100 % — full-rated neutral, not a reduced cross-section tap. Front IP40 is standard for enclosed panel mount; no trip indicator or undervoltage release on this variant.
Maximum power loss is 25 W. Dimensions are 70 mm deep, 101.6 mm wide, 130 mm high — a compact 4-pole footprint that fits standard SENTRON panel cutouts.
The 3VM series is Siemens' value-line MCCB — fixed thermal-magnetic release, no communication, no voltage-trip accessories. The 3VA1110-5ED32-0AA0 and 3VA1110-5ED36-0AA0 are the next-step-up siblings: same 100 A frame and 4-pole count, but with a higher-spec TM release and optional aux contacts. The 3VM1110-5GE42-0AA0 drops into the same panel footprint and bus-bar pattern as those 3VA units — same 70 mm depth, same 101.6 mm width — so if your BOM was built around a 3VA1110-5ED32-0AA0, this 3VM is a form-fit swap for line protection where you don't need the adjustability.