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2. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   Time-delay relay contacts must be specified not only as either normally open or normally closed, but whether the delay operates in the direction of closing or in the direction of opening. The following is a description of the four basic types of time-delay relay contacts. First, we have the normally open, timed-closed (NOTC) contact.

3. Static relay - Wikipedia

   en.wikipedia.org/wiki/Static_relay

   For example, in an induction type electromechanical relay, the time delay for the switching action can be adjusted by adjusting the distance traveled by the disc, whereas in a static relay the delay can be set by adjusting the value of the resistance in an R-C time delay circuit. Static relays may be based on analog solid state circuits ...

4. Protective relay - Wikipedia

   en.wikipedia.org/wiki/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. The ANSI device number is 50 for an IOC relay or a DTOC relay. In a typical application, the over current relay is connected to a ...

5. ANSI device numbers - Wikipedia

   en.wikipedia.org/wiki/ANSI_device_numbers

   2 - Time-delay Starting or Closing Relay; 3 - Checking or Interlocking Relay, complete Sequence ... for example, suffix N is used if the device is connected to a ...

6. Safety relay - Wikipedia

   en.wikipedia.org/wiki/Safety_relay

   Time delay; As such, safety relays monitor a specific function. When connected to other safety relays, they guarantee full monitoring of a plant or machine. [1] They meet the requirements of EN 60947-5-1, EN 60204-1 and VDE 0113-1. [5] Furthermore, there are many variants of safety relays, which are suitable for various machinery applications.

7. Numerical relay - Wikipedia

   en.wikipedia.org/wiki/Numerical_relay

   Digital/numerical relays provide a front panel display, or display on a terminal through a communication interface. This is used to display relay settings and real-time current/voltage values, etc. More complex digital relays will have metering and communication protocol ports, allowing the relay to become an element in a SCADA system.