The protective enclosure is made from different materials, such as polycarbonate, polyester, Nylon 6, Bakelite, thermosetting plastics, and others. Generally, the open-frame contactor features an additional enclosure, which protects the device from bad weather, hazards of explosion, dust, and oil.
What are contactors made of?
A contactor is made up of three components: the enclosure, the electromagnet or coil, and the contacts (sometimes also called poles). The enclosure is self-explanatory and houses the coil and the contacts, including any auxiliary contacts.
Is there silver in contactors?
The material of choice, however, is most often silver-cadmium oxide. The mix is usually 85/15 or 90/10. These contacts are found in most AC contactors for NEMA size 00-6. A 50/50 silver tungsten mix is used for high-amp applications.
What are different types of contactors?
There are two types of power contact; stationary contact and movable contact. The material used for the contacts has stable arc resistance and high welding resistance.
Which material is used for contacts of high rating contactor?
Contacts made of silver cadmium oxide and silver nickel are used in contactors of less ampere rating whereas contacts made of silver tin oxide is used in those of high ampere rating and in DC contactors. The movable set of contacts is attached to the armature or movable electromagnet.
What is a contactor in electrical?
Introduction. A contactor is an electrical device which is used for switching an electrical circuit on or off. … These contacts are in most cases normally open and provide operating power to the load when the contactor coil is energized. Contactors are most commonly used for controlling electric motors.
What is the difference between a relay and a contactor?
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 kind of metal is in a breaker box?
Most electrical boxes are either metal or plastic. Metal boxes are generally made of steel, while plastic boxes are either PVC or fiberglass. Weatherproof metal boxes for outdoor use are generally made of aluminum.
What are silver contacts worth?
This material typically comes to us in gallon size buckets or drums and we pay about $10-$15 per pound depending on the quality and amount of silver they contain. The silver is refined and put back into industries that need it.
What are silver contacts made of?
Coin silver is the most commonly used material in silver contacts, because it is highly effective and less costly than fine silver. Contacts made of coin silver are found in a variety of electronics, usually in the form of rivets, buttons, screws, facings, and wire.
What are the two basic types of contactors?
There are different types of contacts in a contactor, and they are; auxiliary contact, power contact, and contact spring. The power contact has two types that are; stationary and movable contact.
What are DC contactors?
A DC contactor is an electrically controlled device designed to switch current on and off. DC contactors control current in DC circuits by closing and opening internal contacts. DC contactors control much lower voltages than AC circuits and offer the benefit of minimal arcing as the circuit opens and closes.