What two types of relays are used in automobiles?
Types of Automotive Relays
- Change Over Relays. This is the most common type of relay.
- Normally Open Relays.
- Potted Relays.
- Flasher Relays.
- Thermal (Standard) Flasher.
- Electro-Mechanical Flasher.
- LED Flashers.
- Wig-Wag Flashers.
What does a 12 volt automotive relay do?
Automotive relays are for use in 12 volt electrical systems. Relays are used when you need to switch higher currents than a switch can handle, or when you want to isolate an electrical circuit. Our relays have either 5 contacts or 4 contacts.
Can I use a 12V relay in a 24V system?
A trick I have used is driving two 12V relay coils in series on a 24V rail. Then there are other options such as a ballasting resistor, diodes to drop voltage, and even a regulated 12V rail. It’s a lot easier to use 12V coils in a 24V system than the other way around…
Are all automotive relays the same?
The problem is, not all relays are the same. Just because it has the same number/location of terminals, doesn’t mean the relay works for that application. Some relays, when used for the wrong application, can generate a voltage spike over 100V on a traditional 12V system.
When would you use a 12V relay?
Most 12 volt relays operate the accessories in cars and other motor vehicles. When you apply a small amount of current to the relay coil, this closes contacts which in turn feed power to an accessory which would normally require a lot of current to operate.
How many volts can a 12V relay handle?
12V automotive relays operate up to the maximum voltage of a fully charged lead-acid battery, about 15V. The current capacity depends on the particular relay’s contacts.
How many amps does a 12V relay coil draw?
The current draw of the coil is not normally shown but is typically 150-200 mA with a corresponding coil resistance of around 80-60 W. Tip: Knowing the coil resistance is useful when testing the relay for a fault with a multi-meter.
How do I choose the right relay?
An easy way to determine the limit of a relay is to multiply the rated Volts times the rated Amps. This will give you the total watts a relay can switch. Every relay will have two ratings: AC and DC. You should determine the AC watts and the DC watts, and never exceed these ratings.
What does a dual make SPST relay consist of?
Dual Make SPST Relay (Dual Make S ingle P ole S ingle T hrow Relay) an electromagnetic switch, consist of a coil (terminals 85 & 86), 1 common terminal (30), and two normally open terminals (87 and 87b).
What kind of relay is a SPDT switch?
SPDT Relay (S ingle P ole D ouble T hrow Relay) an electromagnetic switch, consist of a coil (terminals 85 & 86), 1 common terminal (30), 1 normally closed terminal (87a), and one normally open terminal (87) (Figure 1).
How many terminals are in a single pole relay?
( S ingle P ole D ouble T hrow Relay) an electromagnetic switch, consist of a coil (terminals 85 & 86), 1 common terminal (30), 1 normally closed terminal (87a), and one normally open terminal (87) (Figure 1).
Can a relay be used for multiple functions?
You can use a single input from one part of an electrical system (e.g. central locking output, manual switch etc.) to activate one or more relays that then complete one or more other circuits and so carry out multiple functions from one input signal.
https://www.youtube.com/watch?v=UAeKTlieYhw