RELAY SCHEMATIC CALLOUT

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Typical Electrical Drawing Symbols and Conventions.
51 - AC Time Overcurrent Relay 52 - AC Circuit Breaker 53 - Exciter or DC Generator Relay 54 - High-Speed DC Circuit Breaker 55 - Power Factor Relay 56 - Field Application Relay 59 - Overvoltage Relay 60 - Voltage or Current Balance Relay 62 - Time-Delay Stopping or Opening Relay 63 - Pressure Switch 64 - Ground Detector Relay 65 - Governor
Protective relay - Wikipedia
In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected.: 4 The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, over-voltage, reverse power flow, over-frequency, and under-frequency.
How To Wire A Relay
Let's discuss how to wire a relay and go through the concepts of how a relay works. A relay is basically a switch but not like a switch that's on a wall. A wall switch relies on someone to flip it which will then control a light or some other type load. A relay is switched by electrical power and not a human.
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