KSB Centrifugal Pump Lexicon –

From A to Z

Relay

Relays are electrical devices/components that are operated via electric current. They are usually electromagnetic, can be switched remotely, and typically have two positions. A control circuit is used for activation and additional circuits can be switched as required.

Relay applications

  • Simultaneous control of several circuits by a single control circuit
  • Control of a high-power circuit via a low-power control circuit
  • Galvanic isolation of the controlling circuit from the circuit to be switched

Normally-open (NO) contacts connect the circuit when the relay is activated; normally-closed (NC) contacts disconnect the circuit when the relay is activated.

  

  

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