What is the principle of operation of a relay?

Relay works on the principle of electromagnetic induction. When the electromagnet is applied with some current, it induces a magnetic field around it.

What are the 4 parts of a relay?

A relay contains a coil, an armature, and at least one pair of contacts. Current flows through the coil, which functions as an electromagnet and generates a magnetic field. This pulls the armature, which is often shaped as a pivoting bracket that closes (or opens) the contacts.

What is relay operating time?

The operating time is the time from when the rated voltage is applied to the coil, until the time when the contacts operate. With Relays that have multiple pairs of contacts, if there are no other conditions, then the operating time is the time required for the slowest pair of contacts to operate.

What is relay and types pdf?

The relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current.

What is OC and EF relay?

ADR131A – Non Communicable 2 OC + 1 EF The ADR131A is a three element numerical relay can having following option , 2 OC +1 EF or 3EF relay with Instantaneous high set and programmable output to simplify feeder protection wiring. ANSI. Protection Functions. 50. Instantaneous Over current Protection (OC-Inst.)

What are two functions of a relay?

The relays perform two basic functions, such as high voltage application and low voltage application. In the case of high voltage, arcing is reduce while in the low voltage applications, overall circuit noise is reduce to a minimum.

Where is relay used?

Relays are normally used in the control panels, manufacturing and building automation to control the power along with switching the smaller current values in a control circuit.

What are the features of relay?

A relay is an electrically operated switch that recognizes an electrical input above a certain value, and carries out the control of opening or closing another circuit.

What is application of relay?

Application Of Relay Relays are used for isolating a low voltage circuit from high voltage circuit. They are used for controlling multiple circuits. They are also used as automatic change over. Microprocessors use relays to control a heavy electrical load.