By appointment electrical devices are divided into groups: control devices: controllers, komandaparaty, Knife and switches, reosta-ty, magnetic contactors and starters, protection devices:

By appointment electrical devices are divided into groups: control devices: controllers, komandaparaty, Knife and switches, reosta-ty, magnetic contactors and starters, protection devices:
Fuses, automatic switches, modular enhancements series switches AC high voltage surge limiters, switches Differential (VD1-63) and other devices relaying: Current transformers, voltage ransformtaory, microprocessor and microelectronic devices pro-con (MICOM, ABB, Эnerhomashvyn, Kyivprylad and other relay-contact protection relay.)
By operating voltage: low to 1000 high and more than 1000. Low-voltage apparatus conventionally divided into sets neavtomatych-term steps, distance and automatic action relay.