What this MCCB carries — and what that means on the panel
This Siemens 3VA1116-4EF36-0BH0 is a 3-pole IEC frame 160 molded case circuit breaker from the 3VA1 series, rated at In=160A with a TM240 thermal-magnetic trip unit. The 'breaking capacity class S' means it can interrupt 36 kA at 415 VAC — enough for most industrial distribution boards downstream of a transformer, but not for a main service entrance with a higher fault current. The TM240 trip gives you an adjustable overload range from 112 A to 160 A via a dial, and the short-circuit pickup (Ii) is adjustable from 5× to 10× In, so you can set it to ride through motor inrush or tighten it for feeder protection. The part arrives with an undervoltage release (UVR) coil rated for 24 V DC — that's the 'UVR 24V DC' in the order code. If the control voltage drops, the breaker trips immediately, which is standard for emergency-stop or safety interlock circuits where loss of power must open the load. It also includes two HQ auxiliary switches and one HQ trip alarm switch, so the panel PLC gets a separate status contact for 'breaker on' and 'breaker tripped on fault' — no need to add a separate auxiliary block later.
Panel fit and wiring notes
The 3VA1 frame 160 mounts on a DIN rail or can be screw-fixed to a backplate. Clamp connections on both line and load sides — no lugs needed for the main conductors, which saves a few minutes per termination on a panel build. The UVR coil draws its 24 V DC from the control circuit; if you're reusing an existing panel's 24 V bus, verify the coil's inrush doesn't drop the bus below the PLC's hold-up threshold. The two HQ auxiliary switches and the trip alarm switch are wired via the front-accessible terminal blocks, so you can land the control wiring without pulling the breaker out of the panel.