How does a fan relay work?
The function of the cooling fan relay is to convert a low voltage signal from either the electronic control module (ECM) or a thermostatically controlled sensor. The cooling fan relay takes the low voltage signal and internally switches the relay “on” to allow battery voltage to be supplied to the radiator cooling fan.
Why is a relay needed?
Relays can reduce the need for high-amperage wiring and switches, which are expensive and take up space. Therefore, switching to relays in your electronic systems can reduce the size or weight of a casing, for instance, or allow manufacturers to fit more functionality into a space of the same size.
Why are relays important?
Relays are mainly used for remote switching, and for high voltage or high current switching. They are particularly valuable because they can control these high voltages and currents with only a small voltage or current in return. Relays function as AC power switches, and keep the control signals electrically isolated.
How does a furnace relay work?
The electric relay in a furnace is responsible for relaying electrical power to the heating elements and the blower motor inside the furnace cabinet. The heating elements provide the heat to warm the air, and the blower motor sends this warmed air through the ductwork.
Why use a relay vs a switch?
While a relay does add an extra step to the switching process, the main advantage is that you can leave the actual switching of high-power circuits for things like off-road lights or air compressors in the engine compartment, and control that switching with a much smaller amperage circuit that energizes the relay’s …
Are relays AC or DC?
General Purpose Relays are electromechanical switches, usually operated by a magnetic coil. General purpose relays operate with AC or DC current, at common voltages such as 12V, 24V, 48V, 120V and 230V, and they can control currents ranging from 2A-30A.
Why is relay used in electrical circuits?
Relays are utilized to protect electric power systems against trouble and power blackouts as well as to regulate and control the generation and distribution of power. it is used mainly for switching.
What does a Furnace Fan relay do?
Purpose of the Fan Center Relay: The purpose of the fan center relay is to provide a low voltage control (24 Volts) to control a relay that can be used to control two-speed blower motors and auxiliary circuits in heating or cooling equipment.
What is AC solid state relay?
A Solid State Relay or Contactor (SSR or SSC) is an electronic component that switches Power (AC or DC current) to a load circuit and provides electrical isolation between an application’s control circuit and load circuit.
What is a controlled relay?
A Control Relay is also known as a Relay, is a switch, an electromagnetic switch. A control relay allows electrical current to flow through a conducting coil that opens or closes a switch. It also protects the circuit current. With a control relay, users do not need to manually turn the switch to isolate or change the state of an electric circuit.