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Consider the following statements with respect to a relay: 1. A relay is energized if NC contacts are opened. 2. The pickup current is the minimum relay coil current required to keep a relay energized. Which of the above statements is/are correct?

Consider the following statements with respect to a relay: 1. A relay is energized if NC contacts are opened. 2. The pickup current is the minimum relay coil current required to keep a relay energized. Which of the above statements is/are correct? Correct Answer 1 only

Relays:

  • Relays are switching devices that open and close circuits electromechanically or electronically.
  • Relays control one electrical circuit by opening and closing contacts in another circuit.

 

Contacts in Relays:

  • There are two sets of electrically conductive contacts. One pair of contacts are classed as Normally Open (NO) or make contacts and another set which are classed as Normally Closed (NC) or break contacts.
  • NO contacts allow current when the relay is energized. This means when there is voltage, the contact closes and allows current to flow through.
  • NC contacts allow current when the relay is not energized. Opposite to NO, NC contact opens and interrupts the current flow.

 

Relay is energized: NO contacts closed; NC contacts opened

Relay is not energized: NO contacts opened; NC contacts closed

Therefore, statement 1 is true.

Pickup current: The minimum amount of relay coil current necessary to energize or operate the relay. That means the current for which the relay initiates its operation is called pick up current of relay, but it is not the minimum relay coil current required to keep a relay energized.

Therefore, statement 2 is false.

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