What this MCCB is and what it does
The Siemens SENTRON 3VA1010-2ED42-0BA0 is a 4-pole molded case circuit breaker (MCCB) rated for 100 A continuous current with a TM210 thermal-magnetic overcurrent release. It is the line-protection version — meaning it guards feeder and distribution circuits against overload and short circuit, not motor-protection curves. The interrupting capacity hits 52.5 kA at 240 V and 32 kA at 415 V, so it handles high-fault utility feeds without cascading upstream. The 800 V rated insulation voltage (Ui) tells you the internal clearances are sized for 690 V line-to-line systems, which is typical for industrial 400/690 V distribution panels. The 4-pole design includes a switched neutral — the N pole opens and closes with the phases, not just a solid link. That matters for TN-S or IT systems where you need full isolation on all conductors.
Thermal derating and real-world current
This breaker carries its full 100 A rating up to 50 °C ambient. Above that it derates linearly: 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If your panel internal ambient runs hot — say a packed enclosure near a furnace line — the 90 A floor at 70 °C still gives you headroom for a 100 A bus, but you lose 10 % of the nominal rating. Plan the load schedule accordingly.
Panel fit and integration
The breaker measures 101.6 mm wide, 130 mm tall, and 70 mm deep — a standard 4-pole MCCB footprint that fits Siemens' SENTRON mounting plates and busbar systems. IP40 on the front means it's protected against tools and wires >1 mm, but not against water ingress; keep it inside a panel or enclosure. The undervoltage release (UVR) is built in, so if your safety circuit drops the control voltage, this breaker trips without a separate shunt trip module.