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 GJL1311001R8015 reference specifically is a power contacter to switch the AC power supply.
Its features are: Nominal control power supply Us to CA 50HZ: 380 - 415 V, nominal control power supply Us to CA 60HZ: 380V, drive voltage type: CA, nominal running current Ie in CA-1, 400 V: 20A, nominal running current Ie in CA-3, 400 V: nominal operating power assigned in CA-3, 400 V normally closed contact number 1,5k, NEMA.