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FIIG:  A545E0

Entry Date:  Jun-05-2009

Concept:  

Status:  A

Applicability:  

Type:  0

Definition:  An electronic relay that manages simple automation systems. It may be used for the monitoring of current, voltage, power, and the like, in electrical circuits or networks to signal exceedances values and prevent the shutdown of electrical installations. It may be directly programmed using front panel and push button or operate by remote control by addition of communication or connection interface. It may be easily upgraded for enhanced performance by adding various extensions for communication networks or for increasing the number or inputs/outputs.

Basic INC:  70595

Basic Name:  RELAY

Description:  1. (Electrical) A protective or control device which completes or breaks an electrical circuit in response to electrical changes in an external circuit. The contacts and actuating element are not in series. It is not designed to permit manual opening of the protected or controlled circuit but may have facilities for manual closing or reset upon automatic opening of the circuit. It is classified by the type of contact actuation, such as armature, meter movement, motor driven, rotary, and solenoid rather than by its application. Such uses as time delay, antenna switching, and keying are secondary features since, for example, a time-delay relay may be of the armature, motor driven, solenoid, or thermal type. MOTOR-DRIVEN SWITCHES, PHOTOELECTRIC TUBES, AND ELECTRON TUBES WHICH MAY FUNCTION AS SWITCHING DEVICES ARE NOT CONSIDERED AS RELAYS. For items with provisions for manual operation, see RELAY-SWITCH. For items in which the contacts and actuating elements are in series, see CIRCUIT BREAKER. See also REGULATOR, VOLTAGE; REGULATOR, CURRENT; SWITCH (as modified); and TIMER, SEQUENTIAL.