CONTECTORGroup members name: PATEL MEGHA R. (120220109006) SHYARA PARTH S. (120220109046) GAMIT MAHESH D. (120220109058) PATEL ANKIT S. (120220109032)

CONTENTS1. Defination2. Features3. Construction4. Operating principle5. Utilization categories6. Advantages7. Disadvantages8. Application9. Siemens Sirius contactor

1. DEFINATION A contactor is an electrically controlled switch

used for switching an electrical power circuit , similar to a relay except with higher current ratings.

It is an electro-mechanical switching.

2. FEATURES1. A contactor is a relay that is used for switching power.2. They usually handle very heavy loads like an electric motor, lighting and heating

equipments and so on.3. Though their output is used for switching very high loads, they are controlled by a

circuit with very less power.4. According to the loads they handle, they vary in sizes from a small device to as huge

as a yard .5. Though they are used for switching purposes, they do not interrupt a short-circuit

current like a circuit breaker.6. They have ratings ranging from a breaking current of a few amperes and 24 DC volts

to thousands of amperes with many kilo volts.

3. CONSTRUCTION

Components of contactor• Movable contacts• Stationary contacts• Armature• Spring• Electromagnet• Power circuit• Control circuit• coil

Types of coils use in contactor1. AC coil2. DC coil

In AC coili. 110 voltii. 240 voltiii. 415 volt

In DC coili. 12 voltii. 24 volt

4. OPERATING PRINCIPLE

5. UTILIZATION CATEGORIES

6. ADVANTAGES• Protection• Simply operating• High-load capacity• Low power consumption• Fast switching

7. DISADVANTAGES• Dose not include overload protection• Effects of excessive use of contacts

8. APPLICATIONLighting Control Contactors are often used to provide central control of large lighting installations, such as an office building or retail building. To reduce power consumption in the contactor coils, latching contactors are used, which have two operating coils. One coil, momentarily energized, closes the power circuit contacts, which are then mechanically held closed; the second coil opens the contactor.Magnetic Starter A magnetic starter is a device designed to provide power to electric motors. It includes a contactor as an essential component, while also providing power cut-off, under-voltage, and overload protection.

9. SIEMENS SIRIUS CONTACTOR

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