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Time Relay Protector
The various protective functions available on a given relay are denoted by standard. For example, a relay including function 51 would be a timed overcurrent protective relay. An overcurrent relay is a type of protective relay which operates when the load current exceeds a pickup value. It is of two types: instantaneous over current (IOC) relay and definite time overcurrent (DTOC) relay.
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Relay protector burns out
Relay burnout may have been caused by overcurrent, overvoltage, vibration, or short circuit. (It does not mean that the relays burn continuously with flames, because flame-retardant materials are used for the relay components. Overvoltage can also damage the relay by applying a voltage higher than it can handle. ) Contact vibration (ultra-frequent switching) causes continuous arcing. An installed relay burned out and no longer operates. We mainly use them as they can be used to control much larger levels of power by only using a small level of input power.