SENTRON 3VA1132-5GF46-0AA0 — 32 A 4-Pole MCCB, Line Protection
The Siemens SENTRON 3VA1132-5GF46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated at 32 A continuous, designed for line protection in distribution panels. It carries a TM240 thermal-magnetic overcurrent release — the '240' indicates the release frame is sized for 240 A maximum, but this unit is factory-set to 32 A, so the trip curve is calibrated for that lower rating. The interrupting capacity is 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V, which covers most industrial low-voltage fault levels.
Thermal Derating and Power Loss
The 32 A rating holds at ambient temperatures up to 50 °C. At 55 °C it derates to 31 A, at 65 °C to 30 A, and at 70 °C to 30 A. If the panel ambient runs hot — say, near a drive cabinet or in a non-climate-controlled electrical room — factor that derating into the load schedule. The maximum power loss is 10.6 W per pole, so four poles dissipate about 42 W total; ensure the enclosure has enough ventilation or forced airflow to keep internal temperature below the 70 °C operating maximum.
Dimensions and Panel Fit
The breaker measures 130 mm high, 101.6 mm wide, and 70 mm deep. The 4-pole width (101.6 mm) is standard for a 4-pole MCCB in this frame class — it occupies four 25.4 mm (1-inch) module spaces on a DIN rail or panel-mount footprint. Depth of 70 mm means it clears most standard enclosure back-panels without interfering with gland plates or busbar trunking behind it.