How does a lockout relay protect a circuit?

Lock out relay is an electromechanical relay which latches its output contact. As the name suggests, this relay once operated locks out the circuit. Locking out means that circuit cannot be normalized until and unless this relay is reset. These relay have two types of coils: operating and resetting coil.

What is use of lockout relay in HT voltage?

Answer: A lockout relay is palced in line before or after the switch so the power can shut off at one of the central location. Basically it is a master trip relay which takes all the signals from the relay and finally trips the breaker during faulty condition.

What is compressor lockout relay?

The purpose of the lockout relay is to keep the compressor off when there is a significant fault, EVEN if the fault condition goes back to normal. For example, if a high-pressure switch opens, the lockout relay can keep the system off, even once that switch closes again.

What is the purpose of a lockout relay quizlet?

What is the purpose of a lockout relay? A device that trips and locks the breaker in an open or tripped status.

How does a compressor lockout work?

Function. A switch inside of a compressor keeps track of the pressure caused by materials in the tank of the device using the compressor. If this pressure reaches dangerous levels the switch monitor identifies this and shuts the compressor down.

What is a lockout circuit?

[′läk‚au̇t ‚sər·kət] (electronics) A switching circuit which responds to concurrent inputs from a number of external circuits by responding to one, and only one, of these circuits at any time. Also known as finding circuit; hunting circuit.

Which are the two types of relays?

Types of Relays – A Thomas Buying Guide

  • Relays are electrically operated switches.
  • Electromechanical relays have an electromagnetic coil and a mechanical movable contact.
  • Solid-state relays are solid-state electronic components that do not have any moving components, which increases their long-term reliability.

How does an 86 lockout relay work?

Lockout relays are nothing but a manual reset relays, which ensure the fault has been cleared or inspected correctly. Lockout relays are activating multiple contacts at the same time.

What is lockout relay?

Lockout relays are nothing but a manual reset relays, which ensure the fault has been cleared or inspected correctly. Lockout relays are activating multiple contacts at the same time. Best example for lockout relay is synchronous TNC switch and Mater trip relays 86 M, 86 H.

How to use a single lock out relay (86)?

But it is also possible to use a single lock out relay (86). In this scheme, output contacts of different protection relays are parallel connected to the operating coil OC of the master trip relay. Thus if any one of the protection relay actuates, master trip relay will be operated and flagged.

How does the lockout relay coil LR work?

When the Lockout Relay coil LR is energies, it would release the mechanical latch holding the handle at ‘RESET” position and the handle would spring return to ‘TRIP” position.

Why does a lock out relay trip the circuit breaker?

On energization of lock out relay, its output contacts will change their status. If Normally Open (NO) contacts of this relay are used in trip circuit, then, this contact will become NC and hence the 220 V DC supply to the trip circuit will be extended. This in turn will trip the circuit breaker.