Protective relays are devices that are connected to instrument transformers to receive input signals and to circuit breakers to issue control commands for opening or closing. In some instances, the relays are also connected to the communication channels to exchange information with other relays.

Miniature High Power Relay With Flanged Mounting
Miniature PCB Relay 5A/250VAC
Transparent Cover Miniature High Power Relay
Multi Featured Miniature Power Relay