With microprocessor-based relays, the 86 lockout relay function can be moved into the relay logic. The lockout can be configured to require an operator to manually interact with the relay and ...

Explanations even stretch as far as the electrical industry, where devices had numbers—a 27 was an undervoltage relay, 43 was a selector switch, and an 86 was a trip and lockout device, so an 86 ...