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Capacitor Duty Contactors(3Phase AC)

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HAVELLS Contactor Price List w.e.f 5th September 2013 (VIEW) HAVELLS Customer Care No:+91-120-4771000

L&T Contactor Price List w.e.f 1st JANUARY 2015 (VIEW)            L&T Customer Care No:18002094545​

SCHNEIDER Contactor Price List w.e.f 20thDecember 2013 (VIEW)  SCHNEIDER Customer Care No:18001030011

BCH  Contactor Price List w.e.f 9thjuly 2013VIE W)        BCH Customer Care No:+91 22 3967 7000

Introduction of Contactors

contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. A contactor is controlled by a circuit which has a much lower power level than the switched circuit. Contactors come in many forms with varying capacities and features. Unlike a circuit breaker, a contactor is not intended to interrupt a short circuit current. Contactors range from those having a breaking current of several amperes to thousands of amperes and 24 V DC to many kilovolts. The physical size of contactors ranges from a device small enough to pick up with one hand, to large devices approximately a meter (yard) on a side.

Contactors are used to control electric motors, lighting, heating, capacitor banks, thermal evaporators, and other electrical loads.

Current Rating of Contactor

The current rating of the contactor depends on utilization category. Example IEC categories in standard 60947 are described as: AC-1 - Non-inductive or slightly inductive loads, resistance furnaces

  •  AC-2 - Starting of slip-ring motors: starting, switching-off
  •  AC-3 - Starting of squirrel-cage motors and switching-off only after the motor is up to speed. (Make Locked Rotor Amps (LRA), Break Full Load Amps (FLA))
  •  AC-4 - Starting of squirrel-cage motors with inching and plugging duty. Rapid Start/Stop. (Make and Break LRA)Relays and auxiliary contact blocks are rated according to IEC 60947-5-1.
  • AC-15 - Control of electromagnetic loads (>72 VA)
  • DC-13 - Control of electromagnets.

Operating Principle of Contactors

A contactor works on the principle of Electro-magnetism. IT comes under the category of switch gears and all the switch gears perform the same function of Switching.
A contactor consists of mainly 2 parts-Fixed and movable jaws. the fixed jaws are firmly connected with the circuit and is a provided with a COIL having movable jaw as soon as current is allowed to flow from the circuit the COIL gets charged and due to electromagnetic effect it attracts the 
movable metal jaw, thus the circuit is complete with the CONTACT provided by the movable jaw. This is the functioning of contactor. When current through the circuit ceases, coil demagnetizes and movable jaw is pulled apart .

Applictions of Contactors

Lighting 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 contacts.

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-cutoff, under-voltage, and overload protection.

Vacuum contactor:-

Vacuum contactors utilize vacuum bottle encapsulated contacts to suppress the arc. This arc suppression allows the contacts to be much smaller and use less space than air break contacts at higher currents. As the contacts are encapsulated, vacuum contactors are used fairly extensively in dirty applications, such as mining.

Vacuum contactors are only applicable for use in AC systems. The AC arc generated upon opening of the contacts will self-extinguish at the zero-crossing of the current waveform, with the vacuum preventing a re-strike of the arc across the open contacts. Vacuum contactors are therefore very efficient at disrupting the energy of an electric arc and are used when relatively fast switching is required, as the maximum break time is determined by the periodicity of the AC waveform.


 Our Major Brands of Contactors are

Havells Contactor, L&T Contactor, Schneider Contactor , Siemens Contactor