What it is and what it does
The Siemens SENTRON 3VA1010-4ED32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for line-protection duty — the standard choice for a main or feeder breaker in a distribution panel where you need thermal-magnetic overcurrent protection without communication or ground-fault monitoring built in. Continuous current rating holds at 100 A from 40 °C up to 50 °C, then derates to 98 A at 55 °C and 91 A at 70 °C — so in a warm enclosure you lose about 9 A off the nameplate by the time ambient hits 70 °C. Breaking capacity is the headline: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA figure at 240 V tells you this breaker handles high-fault utility feeds or transformer secondaries without cascading upstream. Rated insulation voltage is 800 V, so it's comfortable on 480/277 V or 600 V systems with headroom to spare.
Overcurrent release and internal architecture
Fitted with a TM210 thermal-magnetic release — the '210' denotes the fixed thermal pickup and magnetic trip threshold. No electronic adjustment, no communication module, no voltage or undervoltage trip. It's a straightforward, field-reliable design: if you need adjustable LSIG or zone-selective interlocking, you step up to the electronic-release variants in the 3VA family. Internally the breaker uses a supplied basic switch (order code 3VA10104ED320AA0) and carries three auxiliary switches HQ as standard — useful for remote status indication without adding a separate aux block. Maximum power loss is 25 W — modest for a 100 A frame, so ventilation in a sealed enclosure isn't a crisis, but don't stack it tight against heat-sensitive components.
Panel fit and environment
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. Operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Fine for an indoor panel in a conditioned space or a warm factory floor; the storage range covers cold shipping. No trip indicator, no ground-fault monitoring, no communication function — this is a bare-bones line-protection MCCB. If the BOM calls for those features, check the 3VA variants with electronic releases or the 3VA1 series with communication modules.