Mell What is a contact relay?
Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized.
What is the function of contactor relay?
A contactor is a special type of relay used for switching an electrical circuit on or off. They are most commonly used with electric motors and lighting applications.
What is difference between contactor and relay?
A contactor joins 2 poles together, without a common circuit between them, while a relay has a common contact that connects to a neutral position. Additionally, contactors are commonly rated for up to 1000V, while relays are usually rated to only 250V.
What is relay and types of relay?
Relays are electrically operated switches. They are used to control a circuit by a separate low-power signal or to control several circuits with one signal. The three main types of relays are electromechanical, solid-state, and reed. This overload protection relay reacts to overheating.
What are the two main electrical parts of a relay or contactor?
The contacts are the current-carrying part of the contactor. This includes power contacts, auxiliary contacts, and contact springs. The electromagnet (or “coil”) provides the driving force to close the contacts. The enclosure is a frame housing the contacts and the electromagnet.
How is a contact multiplier relay used in a circuit?
Contact multiplier relay use or increase the number of contact from any circuits. It just converts single contact into N number of contacts. These relays are mainly used in circuit breaker’s circuit.
What kind of circuit is a Master trip relay?
Master trip relays are generally a contact multiplication relay whose coils operates on 220V DC and have multiple NO & NC contact for extending tripping command to circuit breaker trip coils, providing CB interlock, contacts for extending events to control room or SCADA.
Why does master trip relay 86 have higher contact capacity?
Master Trip Relay has higher Contact Capacity and so if there is any fault in the Tripping Circuit, the contacts of the 86 relay can withstand the Fault Current. If Tripping is given directly from the Protection relay, the contacts of the Protection relay may get damaged , we cannot afford that , as Protection relays are costly.
What’s the difference between a main relay and an auxiliary relay?
High breaking capacity, which allows direct operation on highly inductive circuits. Contact multiplication relay (CMR) operate as same voltage and current level as main relay but in auxiliary relay it can different. CMR just increase number of contacts for more applications. Have you ever googled yourself? Do a “deep search” instead.