What it is and what it does
The Siemens 3VA1580-5EF32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, with a continuous current of 800 A up to 50 °C, derating to 722 A at 70 °C. It's a 3-pole unit with a rated insulation voltage of 800 V, designed for main feeder or large subfeed protection in industrial switchboards and motor control centers.
Interrupting capacity — the real-world headroom
This breaker delivers 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 52.5 kA at 690 V. That's high-interrupting capability for systems with high fault current — think large transformer secondaries or industrial distribution close to the utility service entrance. The 121 kA at 415 V is the figure most European panel designers will check first for selectivity coordination.
Auxiliary and shunt trip configuration
Factory-fitted with 2 auxiliary switches plus a trip alarm switch (HQ designation), and a shunt trip release (STL). That means remote tripping and status feedback are built in — no field retrofit of the accessory stack. The shunt trip is wired to a remote pushbutton or safety relay; the alarm switch signals the PLC when the breaker has tripped on fault.
Lifecycle and sourcing posture
Listed as current production. This is a standard catalog item in the SENTRON 3VA family, not a phase-out or special. For BOM-line sourcing, we quote this to order against an RFQ — availability and current pricing confirmed at quote time.