This is a pure isolator — it carries no overload or short-circuit protection, so it is specified where the upstream breaker handles fault interruption and this device provides visible isolation and switching. The shunt trip release (STL) operates on 220–250 V DC or 208–277 V AC, and the two HQ auxiliary switches report the main contact position back to the control system.
Rated continuous current Iu is 125 A on a 160 A frame — that is the maximum current it can carry continuously without exceeding the 70 °C operating limit. Rated insulation voltage Ui is 800 V, and the maximum operational voltage is 690 V AC 50/60 Hz or 600 V DC, so it covers 400 V and 480 V distribution panels with headroom. If your control voltage is 24 V DC, this release will not pick up — you need a different undervoltage or shunt trip variant.
Panel integration
The 3VA1112-1AA42-0KC0 mounts via the front terminals with busbar connection for the main circuit — it is designed for DIN-rail or direct-panel mounting in a distribution board. The 4-pole width means it occupies four module spaces on the rail. The two HQ auxiliary switches are built-in; no separate aux block purchase is needed for status feedback.