The Siemens 3VA1110-4EF32-0CA0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. It carries a 100 A continuous rating at 40 °C with a TM240 thermal-magnetic trip unit — the fixed thermal element and magnetic pickup are set at the factory, so no field adjustment is needed for the overload and short-circuit thresholds. The 3-pole design fits standard 3-phase feeders. What earns attention here is the interrupting capacity: 121 kA at 240 V AC, 75.6 kA at 415 V, and still 11.9 kA at 690 V. That gives solid fault-clearing headroom on most low-voltage industrial services without needing a current-limiting upstream breaker. The rated insulation voltage is 800 V, so the internal clearances handle 690 V line-to-line comfortably.
Thermal derating and panel fit
The 100 A rating holds flat from 40 °C to 50 °C — no derating needed in a typical ventilated enclosure. Above that, it steps down: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If the panel runs hot, size the feeder for the derated value, not the nameplate 100 A. The maximum power loss is 27.5 W, which is moderate for a 100 A frame; account for it in the enclosure thermal budget. Dimensions: 130 mm tall, 76.2 mm wide, 70 mm deep. Width is a standard 3-inch (76.2 mm) module.
Undervoltage release and auxiliary options
This variant comes with an undervoltage release (UVR) factory-installed. When supply voltage drops below the dropout threshold, the UVR trips the breaker — useful for preventing automatic restart after a brownout on motor feeders or for emergency stop circuits that need a voltage-monitored disconnect. The UVR design is listed as undervoltage release (UVR) type. There is no ground-fault monitoring or communication function on this unit; it is a straightforward line-protection breaker with a thermal-magnetic trip. The trip indicator is not present on this model, and there is no voltage-trigger function. For applications needing a visible trip flag or remote signaling, consider a variant with the auxiliary switch option. The base switch supplied is order code 3VA11104EF320AA0.