I · Glossary
Isolator
Also known as Isolation switch
An isolator is a switch or device used to disconnect an electrical supply from equipment, a circuit or another part of an installation.
An isolator is a switch or device used to disconnect an electrical supply from equipment, a circuit or another part of an installation. In home energy paperwork it may appear as a main switch, isolation switch, switch-fuse, PV array isolator, inverter isolator or another local point of isolation recorded on a certificate, commissioning pack or equipment schedule.
Category
Electrical supply and protection
Applies to
Solar, Battery storage, EV charging, Heat pumps & AC
Last reviewed
02 Jun 2026