Relay types and its working principle

1. What is a relay and its types?
2. What are the working principles of relay?
3. Which relay works AC and DC?
4. What is the most common type of relay?
5. What are the 3 main parts of a relay?
6. What is no vs NC relay?
7. What is principle of induction type relay?
8. Do relays need AC or DC?
9. What are the 3 main parts of a relay?
10. How does a 5 pin relay work?
11. What are the different types of relays in PLC?
12. What is L1 and L2 in a relay?
13. What are 2 types of overload relays?
14. What is SPDT relay?
15. How does a 12 volt relay work?

What is a relay and its types?

A simple electromagnetic relay is made up of a solenoid, which is wire coiled around a soft iron core, an iron yoke that provides a low reluctance path for magnetic flux, a movable iron frame, and one or more sets of contacts. The three main types of relays are electromechanical, solid-state, and reed.

What are the working principles of relay?

It works on the principle of electromagnetism. The electromagnetic field that creates the temporary magnetic field is energised when the relay's circuit detects the fault current. This magnetic field moves the relay armature to open or close connections.

Which relay works AC and DC?

The IS AC/DC relay is a very versatile relay as it will operate on AC voltages ranging from 8 volts to 32 volts, and it will also operate on DC voltages ranging from 10 volts to 35 volts.

What is the most common type of relay?

Electromechanical relays are perhaps the most widely used relays in ATE applications today. They are made of a coil, an armature mechanism, and electrical contacts.

What are the 3 main 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 no vs NC relay?

NC means normally-closed contact. NO means normally-open contact. When the relay coil is de-energized, NC contact becomes open, and NO contact closes. For alert and emergency shutdown (ESD) logic, a break-to-alarm philosophy is employed so that during an emergency, NC contact will become open and trip/provide alarm.

What is principle of induction type relay?

Working Principle – Electromagnetic Relays. The working mechanism of electromagnetic relays is simple to understand. The electromagnetic relay operates largely as per the principle of electromagnetic induction, which also means that as the electric current is passed on the conductor, the conductor behaves like a magnet ...

Do relays need AC or DC?

The operating voltage of a relay is generally in DC. Small signal relays and low voltage power relays are usually in DC, but mains control relays and contactors quite frequently have AC coils. The rest of the terminals of a relay are used to connect either a AC(generally 50/60Hz) or DC circuit.

What are the 3 main 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.

How does a 5 pin relay work?

5 pin relays provide 2 pins (85 & 86) to control the coil and 3 pins (30, 87 & 87A) which switch power between two circuits. They have both normally open and normally closed connection pins. When the coil is activated, power will be switched from the normally closed pin to the normally open pin.

What are the different types of relays in PLC?

The relays are broadly classified into two types namely electromagnetic relays and solid state relays. The PLCs are also classified into two types namely compact PLC and modular PLC. An electromagnetic relay consists of an electromagnet, an armature, set of input terminals and set of control terminals.

What is L1 and L2 in a relay?

1. The two vertical lines that connect all devices on the relay logic diagram are labeled L1 and L2. The space between L1 and L2 represents the voltage of the control circuit. 2. Output devices are always connected to L2.

What are 2 types of overload relays?

Overload relays are typically one of two types: thermal relays or electrical relays. The overload mechanism inside thermal relays consists of a bimetallic strip in conjunction with a heating element.

What is SPDT relay?

A single-pole double-throw (SPDT) relay has one pole and two throws. Based on the default position of the pole, one throw is considered normally open (NO) while the other is normally closed (NC).

How does a 12 volt relay work?

Relays install between the power source and the electrical accessory requiring on/off power. When the relay is energized, the high current to operate the accessory flows from the power source, through the relay, and directly to the part.