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In semiconductor testing, contactor can also refer to the specialized socket that connects the device under test.
In process industries, a contactor is a vessel where two streams interact, for example, air and liquid. See Gas-liquid contactor.A contactor is an electrically-controlled switch used for switching an electrical power circuit. A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 230-volt motor switch.
Unlike general-purpose relays, contactors are designed to be directly connected to high-current load devices. Relays tend to be of lower capacity and are usually designed for both normally closed and normally open applications. Devices switching more than 15 amperes or in circuits rated more than a few kilowatts are usually called contactors. Apart from optional auxiliary low-current contacts, contactors are almost exclusively fitted with normally open ("form A") contacts. Unlike relays, contactors are designed with features to control and suppress the arc produced when interrupting heavy motor currents.
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.

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  1. T

    QLD Can a court make an order for supervised contact if there are pending criminal dvo charges

    Im trying to help a friend with his family court stuff and Im wondering if anyone can tell me if the family court can make an order for supervised contact when there are pending criminal charges (false allegations)? The father hasn’t seen his kids for several years and wishes to establish some...
  2. S

    QLD Contact salary to Hourly

    Looking for advise on a situation. Employee signed a contact stipulating they were a salaried employee. Employer sends a letter stating after discussion, they are making employee hourly. This rate is lower then the original base rate. Employee informs employer in writing they had never...
  3. G

    SA Partner has no access to son. Mother ignoring all contact and mediation.

    Okay so. My partner found out he has a son from a one night stand before we were together. He had no idea until a friend of the mother's sent a Facebook msg to him out of the blue stating that he has a son. That he is in danger and being neglected. Partner contacted the mother to organise a DNA...
  4. B

    Protection of privacy of new wife against demands of contact details from ex-wife

    In the context of parenting matters, is it legal for my ex-partner to demand that I provide the private mobile phone number of my new wife who is not implicated in any wrong-doing and is not a party in the case?
  5. Concerned1

    No contact AVO breaches

    A friend of mine is in a domestic violence relationship and has had an AVO placed against her partner by another party who with witnessed one of the attacks. She has been and still is, too scared to contact authorities about the abuse and various other illegal activities he engages in, for fear...
  6. C

    NSW Father just wants contact

    Hey I'm so my partner decided to move from one state to another. His ex was going with him an during the move decided she no longer wanted to go. He still went as he had a job an house all set up. She didn't go they broke up. They have a very volatile relationship. They both have mental health...
  7. E

    NSW No contact

    What happens to the parent who doesn't contact for long periods of time
  8. A

    VIC Variation to a contested no contact intervention order to allow FDR

    Here is the sequence of events: Police take an family violence intervention order out on S to protect his wife T. T requests that the order keeps S away from the family residence, but does not limit contact in any other way. S elects to contest the order (although the hearings dates are still 6...
  9. L

    QLD Father has had no contact for 3 years

    Hi Everyone, mum just after a bit of advice if anybody has been through a similar situation. My ex husband has had no contact with my child for 3 years now and I was recently served court papers stating he wants to resume visitation. I’m had sole parental responsibility for the past 3 years...