Torgeek
- Why do you need a 12V relay?
- When should a relay be used?
- Where is a 12 volt relay used?
- How many amps before you need a relay?
- What is the main purpose of a relay?
- What voltage does a 12V relay trigger?
- Do you need a relay for every switch?
- What is the purpose of a DC relay?
- What is the purpose of a 12V power supply?
- Can I use a 24V relay instead of 12V?
- What is the purpose of a battery relay?
- Can I use a DC relay for AC?
- Can I use relay for DC?
Why do you need a 12V relay?
In 12-volt automotive circuits, even small resistance amounts can cause significant voltage drop. Relays provide a solution by shortening the required length of the heavy-gauge, power-delivery wire from the battery or alternator to the load.
When should a relay be used?
One of the most common situations that require the use of a relay occurs when an application needs to switch from high to low current (or vice versa) within the same circuit. For example, the temperature sensors that power HVAC units require levels of amperage that vastly exceed the capacity of their wiring.
Where is a 12 volt relay used?
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 many amps before you need a relay?
You will often see circuits carrying less than 20 amps switched directly, while circuits of 30-40 amps can sometimes be directly switched but will often be controlled by relays. Anything above 40 amps is pretty much always on a relay.
What is the main purpose of a relay?
Relays are the switches that aim at closing and opening the circuits electronically as well as electromechanically. It controls the opening and closing of the circuit contacts of an electronic circuit.
What voltage does a 12V relay trigger?
The nominal voltage of a 12V relay is 12V, so 80% of this is 12 x 0.8 = 9.6V. So in theory, this relay should activate at 9.6V.
Do you need a relay for every switch?
Having only one switch to turn off is safer in an emergency, and more convenient as well. If you're into clean-looking systems, you can use one switch and several relays instead of a bank of bulky switches. Relays allow you to use the proper size fuse for each device, and to place the fuses closer to the battery.
What is the purpose of a DC relay?
DC Power Relay Definition
This is a relay that performs high-voltage and high-capacity urgent shutdown of DC circuits. These relays not only energize DC circuit but also shutdown the high voltage circuit at high speed when an error occurs.
What is the purpose of a 12V power supply?
Typical Applications for 12V Power Supplies
Computer peripherals use it, as well as telecommunications and fiber optic networks and voice, data, and analog communications. You may see it being used in universities and educational facilities as well as instrumentation and electronics.
Can I use a 24V relay instead of 12V?
Alternative Use: Operate 24V Relays from 12-13.8V
Once the relay has pulled in, most “24V” relays will hold in quite satisfactorily on 12V or even less. So there's actually no need for a continuous 24V supply – all you really need is that first short pulse.
What is the purpose of a battery relay?
When it comes to battery management, battery isolators and automatic charging relays (also called ACRs or voltage sensitive relays) are both used to safeguard reserve battery power to prevent breakdowns and protect other vital vehicle or boat functions.
Can I use a DC relay for AC?
Just as it is impractical to operate a DC relay from AC, it is likewise impractical to operate an AC relay from DC. However, in an emergency, an AC relay may be operated from DC—provided certain precautions are taken.
Can I use relay for DC?
No, it cannot be used. The element characteristics of Solid-state Relays will not allow it to reset if a DC load is used.
