The Siemens 3VA2110-7MS36-0CL0 is a SENTRON molded case circuit breaker (MCCB) in a 3-pole configuration, rated for 100 A continuous current at 40 °C and carrying a 330 kA interrupting capacity at 240 V. It is designated as starter protection, meaning the overcurrent release (ETU310M) is tuned for motor-starting inrush profiles rather than pure distribution loads. The unit includes an undervoltage release (UVR) as the auxiliary release, so it will trip if control voltage drops below the dropout threshold — a standard requirement for safety circuits that need to drop a motor starter on loss of hold-in power.
Interrupting capacity and thermal derating
The interrupting capacity drops across voltage levels: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. At the panel level, that 242 kA at 415 V gives headroom for high-fault utility feeds or transformer secondaries — you can coordinate downstream without worrying about the main breaker becoming the weak link. Thermal derating is flat from 40 °C to 50 °C at 100 A, then steps down: 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. For a panel running at 55 °C ambient (common in sealed enclosures with drives), the breaker is still good for 96 A continuous.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is a standard 4-module footprint for SENTRON 3VA breakers in this frame size, so it aligns with the busbar and DIN-rail layout in a typical Siemens panel. The 86 mm depth means it clears a 120 mm deep enclosure with room for wiring gutters. Rated insulation voltage is 800 V, and maximum power loss is 75 W — factor that into the enclosure thermal budget if the panel is sealed.
Environmental and endurance
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The latching endurance is rated at 20,000 operations — that is the mechanical life for the latch mechanism, not the electrical endurance under load. For motor-starting duty where the breaker cycles infrequently (a few times per shift), that endurance is effectively the panel's service life.