The Siemens 3VA2440-7HL32-0CC0 is a SENTRON molded case circuit breaker (MCCB) rated for 400 A continuous current through the full 40–50 °C range, with a 3-pole design and an ETU320 electronic trip unit for line protection. It carries a 330 kA breaking capacity at 240 V and 242 kA at 415 V, giving it headroom for high-fault installations like transformer secondaries or large motor control centers where selectivity with downstream devices is critical.
Breaking Capacity and Coordination
The 330 kA at 240 V and 242 kA at 415 V place this breaker in the high-interrupting category — it can clear faults at full rated current without upstream fusing in most distribution panels. At 690 V the capacity drops to 52.5 kA, still sufficient for most 690 V industrial loads. The ETU320 release allows adjustable long-time, short-time, and instantaneous pickup, so you can coordinate with downstream breakers for selective tripping — a key requirement when protecting a bus feeding multiple motor starters.
Thermal Derating and Ambient Range
Rated 400 A from 40 °C to 50 °C without derating; at 55 °C it holds 384 A, at 60 °C 376 A, at 65 °C 368 A, and at 70 °C 360 A. Operating ambient spans -25 °C to +70 °C, with storage from -40 °C to +80 °C. In a sealed panel with multiple breakers, account for the internal temperature rise — the derating curve lets you size the breaker to the actual load without oversizing.
Auxiliary and Release Configuration
Factory-fitted with 2 auxiliary switches (HQ type) and an undervoltage release (UVR) that trips the breaker when control voltage drops below the dropout threshold. The UVR is wired separately from the main power circuit — typical for emergency-stop or undervoltage protection schemes. No communication function, phase failure detection, or ground fault monitoring on this variant; those are available on other 3VA options if needed.