When would you use a 12V relay?
12V DC relay switches are the best solution for full voltage applications, as they allow a low current flow circuit to control a high current flow circuit, like a vehicle’s horn, headlights, auxiliary lamps, fan motors, blower motors and countless pieces of equipment existing on vehicles today.
How does a fan relay switch work?
In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. Essentially an on/off switch, the blower motor relay’s reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor.
Will a 24V relay work on 12V?
Once the relay has pulled in, most “24V” relays will hold in quite satisfactorily on 12V or even less. If a low-side switch is what you need, simply connect Fig,1 to a 12-13.8V DC supply rail and most 24V DC relays will function almost as normal.
Do I need a relay for electric fan?
Most parts stores carry toggle switches and/or push-pull switches that will handle anywhere from 30-60 amps, so that would work. If you’re using one of those thermostatically-controlled deals (or a low amp rated manual switch) you should use a relay.
When do you turn on the fan relay?
When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans. The relay will usually be activated once it is detected that the vehicle’s temperature approaches excessively high temperatures.
Which is the best 12 volt relay fan?
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How does the cooling fan relay work on a car?
The cooling fan relay is the relay that controls the engine’s cooling fans. When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans. The relay will usually be activated once it is detected that the vehicle’s temperature…
How many amps does an automotive Bosch fan relay need?
Left Most Relay – Standard automotive Bosch style relay. Shoot for good quality 40 amp version (not the cheap 20 amp as shown in the picture). These are the most common and easy to install. Center Relay – This is for high current fan systems. The relay is rated at 70 Amps and has screw lug terminals which can be a bit more work to properly make.