Why do we need relays?
But often we need them to drive bigger pieces of apparatus that use bigger currents. Relays bridge the gap, making it possible for small currents to activate larger ones. That means relays can work either as switches (turning things on and off) or as amplifiers (converting small currents into larger ones).
What happens when a relay is energized or triggered?
When energized (electromechanical) or triggered (static), the relay closes the switch to allow current flow. Normally closed relays are the opposite. When energized (electromechanical) or triggered (static), they open, preventing current flow. Relay switches are shown above in their default “de-energized” position.
Are electromechanical relays a good choice?
Electromechanical relays are a tried and true technology. They are inexpensive and will work for both AC and DC circuits. While they may not be as durable or fast as static relays, electromechanical relays are a cost-effective option suitable for many applications.
How do I know if my utility needs a relay?
Check your utility’s electrical service requirement (ESR) documentation or interconnection application to see if your utility requires a specific relay type or model. The relay (whether electromechanical or static) will have a default position: normally open and normally closed.
What is the difference between open and closed relays?
Normally open relays keep the arm of the switch in the open position during normal operation. When energized (electromechanical) or triggered (static), the relay closes the switch to allow current flow. Normally closed relays are the opposite. When energized (electromechanical) or triggered (static), they open, preventing current flow.
Do generators need a normally closed relay contactor?
For example, utilities may require a normally open relay contactor for grid isolation, so the system is isolated by default, even if the relay and isolation contactor or breaker fails. On the other hand, devices with emergency stop buttons—commonly found on diesel generators—will typically use a normally closed relay contactor.
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