The Siemens SENTRON 3VA2040-7HL36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, fitted with an ETU320 electronic trip unit. It's designed for line protection in distribution panels, switchgear, and motor control centers where adjustable overcurrent protection is needed. The ETU320 release offers an adjustable current range from 60 A up to 480 A, so one breaker frame covers multiple load sizes — useful for stocking a single spare that can be dialed in to match the circuit. The 40 A continuous rating holds across the full ambient temperature span from 40 °C to 70 °C, meaning no derating headache in a warm enclosure. Breaking capacity is 330 kA at 240 V AC, dropping to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 3 kA at 690 V. That 330 kA at 240 V is a high-interrupting rating for fault currents near the transformer secondary — this breaker clears a bolted fault without needing an upstream fuse to assist.
Mounting and dimensions
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA2 frame footprint. It mounts directly onto a DIN rail or can be screw-fixed to a backplate. The IP40 front protection means it's fine inside a closed panel; no special sealing needed for the operator face.