Breaking capacity that follows the voltage
The 3VA1120-5EF36-0BC0: This MCCB delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That's a high-interrupting rating for a 20 A frame — it handles fault currents on strong industrial services without needing an upstream current-limiting fuse.
Built-in undervoltage release and auxiliary switches
Factory-fitted with an undervoltage release (UVR) and two HQ auxiliary switches, so it drops the load if control voltage falls and reports position back to a PLC or status lamp. No field-add-on kit needed — that's already accounted for in the 70 mm depth and 76.2 mm width.
Panel fit and thermal management
Mounts on a DIN rail or panel base. The 14.5 W max power loss means it sheds heat into the enclosure — keep ventilation or derating in mind if it's packed tight with other breakers. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems.