ABB it has a large family of contacters: tripolar contacters and overload relays for engine startup and power switching (AF, minicontactors, AS), tetrapolars for switching the power (AF and minicontactors), auxiliary for the switching of auxiliary circuits (AS and minicontactors), for the switching of capacitors (UA.RA), CC.
The GJL1211001R8100 reference specifically is a power contacter to switch the AC power supply.
Its features are: Nominal control power voltage Us to CA 50HZ: 220 - 240 V, nominal control power voltage Us to CA 60HZ: 220V, drive voltage type: CA, nominal running current Ie at CA-1, 400 V: 20A, nominal running current Ie at CA-3, 400 V: nominal operating power at CA-3, 400 V: 4kW, Normally assigned current number 1, auxiliary contact type NEMA.