The Siemens SENTRON 3VA2440-5HL32-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuously across the full ambient range from 40 °C through 70 °C — no derating needed up to that ceiling. It is designed for line protection, meaning it sits at the incoming feeder or main distribution point in a panel, not downstream on a specific motor or branch circuit.
Breaking capacity and what it means for your fault level
At 240 V this MCCB interrupts 187 kA — that is a very high rating, typical for a main breaker close to the transformer secondary where available fault current is highest. At 415 V and 440 V it still holds 121 kA, and at 500 V it drops to 75.6 kA. At 690 V the rating falls to 9 kA, so if your system runs at 690 V you need to verify the available fault current stays under that threshold. The 5 kA rating limited to 1 second is a short-time withstand for selective coordination — it lets the breaker ride through a downstream fault long enough for the branch breaker to clear.
Physical fit and panel integration
The 3VA2440-5HL32-0KC0 measures 248 mm high by 138 mm wide by 110 mm deep. That 138 mm width is a standard 3-pole MCCB footprint for this current class — it fits Siemens SENTRON mounting plates and most 600 V switchgear lineups without adapters. The 110 mm depth means it projects less than 120 mm from the mounting surface, which keeps the gland plate clearance manageable in a 400 mm deep enclosure.
Built-in auxiliaries and release
This unit ships with two HQ auxiliary switches and a shunt trip (STL) release factory-installed. The shunt trip lets you remotely trip the breaker via a control signal — useful for emergency-stop circuits or undervoltage protection schemes. The two aux switches provide status feedback (open/closed/tripped) to a PLC or annunciator panel. There is no undervoltage release on this variant, so if you need UVR you would look at a different suffix. The basic switch core is order code 3VA2440-5HL32-0AA0.