What this MCCB is and what it does
The Siemens SENTRON 3VA1010-3ED42-0BH0 is a 4-pole molded case circuit breaker (MCCB) rated for 100 A at 40 °C, designed for line protection in distribution panels. Its breaking capacity reaches 75.6 kA at 240 V AC and 52.5 kA at 415 V AC, which means it can safely interrupt high fault currents on industrial feeders without upstream cascading. The rated insulation voltage is 800 V, so it suits 400/480 V systems with headroom.
Current rating and thermal derating
The breaker holds 100 A continuously at ambient temperatures up to 50 °C. Above that, the thermal trip element derates: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your panel ambient runs hot — say, near 60 °C — you need to account for that 4 A reduction when sizing the load.
Breaking capacity across voltage levels
The interrupting rating drops as system voltage rises: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 400 V line with an available fault current of 50 kA, this breaker provides adequate margin. At 690 V, the 7.5 kA rating limits its use to lower-fault installations.
Integrated auxiliary and release options
This variant includes an undervoltage release (UVR) and a factory-fitted auxiliary switch block: 2 auxiliary switches plus 1 trip alarm switch (HQ). The UVR trips the breaker when control voltage drops below a threshold, which is useful for safety circuits or remote shutdown. The auxiliary contacts provide status feedback to a PLC or indicator lamp.
Physical footprint and panel fit
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth. The 101.6 mm width (4 inches) matches standard MCCB panel cutouts for 4-pole breakers. Depth of 70 mm leaves room for rear bus connections in a typical distribution cabinet.