What it is and what it does
The Siemens SENTRON 3VA1010-4ED42-0HC0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous rating of 100 A at 40 °C, derating to 91 A at 70 °C, so the thermal curve is worth checking if your enclosure runs hot. The interrupting capacity hits 121 kA at 240 V, dropping to 75.6 kA at 415 V and 11.9 kA at 690 V — high enough for most secondary distribution applications where fault current is substantial. This breaker ships with a shunt trip release (STL) and two auxiliary switches HQ pre-installed, which saves panel-builder wiring time if remote tripping or status feedback is required. The supplied basic switch variant is 3VA10104ED420AA0 — that's the base breaker core this order code builds on.
Panel fit and integration
Footprint is 101.6 mm wide, 130 mm tall, 70 mm deep — standard for a 4-pole SENTRON 3VA frame. Mounts on DIN rail or can be screw-fixed to a backplate. The 70 mm depth means it clears most 200 mm deep enclosures with room for wiring gutters. No communication function onboard, no undervoltage release, no ground-fault monitoring — this is a plain line-protection breaker with a shunt trip add-on. If you need Modbus or ground-fault, you're looking at a different 3VA variant.