The Siemens SENTRON 3VA2340-6JP32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, designed for line protection in industrial power distribution. It carries an electronic ETU550 overcurrent release, which means you get adjustable trip curves rather than fixed thermal-magnetic action — useful when coordinating with downstream breakers or managing inrush on motor circuits.
Breaking capacity and what it means on site
This breaker is rated 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. Those figures are the maximum fault currents it can safely interrupt at each voltage level — if your panel's available fault current at 480 V is, say, 100 kA, this unit clears it without welding contacts or venting plasma. The 690 V rating drops to 7.5 kA, so confirm your high-voltage system's short-circuit capacity if running above 600 V.
Thermal derating curve — real-world current
Rated 400 A from 40 °C up to 50 °C ambient. At 55 °C it derates to 375 A, at 60 °C to 350 A, at 65 °C to 325 A, and at 70 °C to 300 A. If your panel runs hot — say a packed enclosure near a furnace line — size the load to the derated figure, not the nameplate 400 A.
Dimensions and panel fit
The case measures 248 mm tall, 138 mm wide, and 110 mm deep. That 110 mm depth is the dimension to watch when fitting into a shallow enclosure or against a backplate with bus bars running behind it. IP40 on the front face means it's protected against tools and wires >1 mm, but not against water — mount it indoors or in a weatherproof cabinet.
Lifecycle and sourcing
Listed as current production — no end-of-life notice on this order code. The ETU550 electronic trip unit includes communication capability (PROFIBUS or similar via a communication module), so it fits into a monitored distribution scheme. Insulation voltage rated 800 V, power loss 96 W at full load — factor that into your enclosure ventilation.