The use of a 20 amp contactor is a popular method of controlling electrical power in all parts of the home, business and industry. Controlling the flow of electrical power to electrical devices, such as electric lights, motors and HVAC (Heating, Ventilating and Air Conditioning) systems, is primary function of this type of contactor. A 20-amp contactor has enough capacity to be used for most types of equipment or circuits with a total load of 20 amps or less, whether they are used solely or in combination with other pieces of equipment. How does this type of contactor work and what types of contactors will I run into in everyday usage? Let’s take a closer look at the functions of a 20-amp contactor; as well as what applications it can be used in; and finally, we will answer common questions about 20-amp contactors.
What is a 20 Amp Contactor?
A contactor is a type of electric switch that can be operated with electric power and is used to switch on or off high power electrical loads. In this case, the 20 Amp contactor has the capability to switch on or off loads that operate at 20 amps. Additionally, there are several different types of 20 Amp contactors including the 20 Amp contactor 2 pole & the 20 Amp contactor 3 pole; each of these types will have the ability to control a specific number of circuits at the same time.
An electromagnetic coil is used by the contactor to operate any electrically powered equipment or devices. When the control voltage is applied to energize the coil, an electromagnet is created, and the movable armature of the contract lifts up to make/or break a circuit, allowing the flow of electric current to connected equipment and devices without having to manually toggle high-voltage on/off switches that can be dangerous and heavy. Users are able to control equipment from far away using low-voltage signals instead of having to manually turn them on and off at high voltage switches.
How Does a 20 Amp Contactor Work?
The functionality of the 20 Amp contactor can be broken down into simple steps:
1. The contactor coil is operated by a low voltage supply (normally between 24V and 120V) and is usually activated from the control circuit through a timer, thermostat or switch.
2. The movement of an electric current passing through the coil produces an electromagnetic field that attracts the movable core or armature within the contactor.
3. Closing Contacts: When the armature moves to contact the two contact points together, it closes the electrical circuit allowing current to flow between the power source and load.
Circuit Breaker—When power is lost to a circuit breaker, its electromagnet is de1_{electrified}, thus releasing its armature and separating the contact points. This action creates an open circuit through which current cannot flow.
The simple and dependable methods of contactors make them the generally preferred solution for these types of applications to switch on and off large electrical systems as electrical safety hazards are minimized, protection against sudden surges, as well as conserving energy when the system is not in use.
Applications of 20 Amp Contactors
20 amp contactors are versatile and can be found in numerous applications, including:
1. HVAC Systems: Contactors are typically used in HVAC (heating, ventilation and air conditioning) installations for controlling a compressor, fan or pump. An example is using a 20 amp contactor in an HVAC circuit that allows a thermostat to turn the equipment either on or off.
2. Appliances & Lights in the Home: Appliances and lights can be controlled automatically through an energy management system. Typically, 20 amp contactors will be used for the automation of such controls, e.g. Water heater Controls and Pool Pumps.
3: Industrial Machine: 20 amp Contactors used to synchronize the operation of motors (electric or hydraulic), conveyor belts, or manufacturing equipment in an industrial facility. The 3-phase power capabilities (example: 20 amp contactor 3 pole) are ideal for these applications.
4. Commercial Structures: These devices are essential for controlling lights, heat, and air conditioning in schools, businesses and chains. They operate reliably and efficiently by operating at high loading power ratings.
Advantages of Using a 20 Amp Contactor
There are several benefits to using a 20 Amp Contactor in your electrical system:
When using a low-voltage control signal, you can operate high power systems from a long distance while maintaining safety.
By effectively controlling current and voltage flow, contactors can reduce the number of electrical hazards (e.g., short circuits and overloads) resulting from electrical faults.
Durable: These contactors have been designed to withstand extremely high currents. They will remain operational under the harshest of conditions.
Energy Efficiency: The energy usage of the equipment can be controlled by using a contactor, allowing you to turn off equipment and lighting that isn’t being used quickly and simply.
Frequently Asked Questions
What is the main purpose of a contactor?
A contactor is used to control electric power’s flow through a circuit. A contactor is in between the electric source and the equipment being used. It enables the operator to manage the operation of high-current machines and equipment from a remote and safe location. It protects against electrical dangers and helps ensure efficient operation.
Can an AC system work without a contactor?
In theory, running an AC unit without a contactor could occur but this is potentially dangerous and not a wise choice. This is because the contactor acts as a safety switch that helps protect your air conditioning unit against overcurrent, which is the amount of electrical power flowing through a circuit at any one time. If the electrically operated contactor is not present, then it is possible for there to be electrical hazards, equipment failure due to damage from excessive current and overloads because of improper installation on an AC unit with no contactors.
What’s the difference between a circuit breaker and a contactor?
While both breakers and contactors work directly with electricity, the purpose/functionality of each is quite different. A circuit breaker is a safety device, designed to detect an over-current situation or short and disconnect electrical current to prevent damage/hazards. A contactor is used for controlling the supply of electrical power to some type of load (i.e. turning something on/off). While the breaker serves mainly as a protective device, the contactor is more a would be referred to as an operational/functional part of an electrical circuit.
What are the three types of contactors?
There are three main types of contactors:
1. Electromagnetic Contactors: This type of contactor is very common; it uses a magnetic coil that opens or closes the supply of electricity. It is highly reliable and is used in residential and industrial applications.
2. Solid State Contactor: Solid state contactors use solid state electronics rather than traditional magnetic types to control the circuit. They offer maximum durability and are the ideal choice in situations where frequent switching operations are necessary.
3. Motor Starters: Motor starters are specifically designed for starting/ stopping motors, most motor starters include an overload protection feature, so they are used with all types of rotating machinery.
Different types of contractors offer various pros and cons based on application, making them adaptable ways to control electrical systems efficiently.
