Relay Pinout

September 18, 2024 Post a Comment

Relay pinout

5 pin relays have two pins (85 & 86) for controlling the coil and three pins (30, 87 & 87A) for switching power between two circuits. They have connection pins that are both normally open and normally closed. Power is switched from the normally closed pin to the normally open pin when the coil is activated.

What do pins 30 and 87 do on a relay?

One of these will be used to ground your current, while the other will be connected to a switched power source. 87 and/or 87a will be connected to your controlled accessories that you wish to turn on and off with your relay. 30 will then be the pin connected to your battery power.

What is 85 and 86 on a relay?

85 and 86 are the coil pins while 30, 87, and 87a are the switch pins. 87 and 87a are the two contacts to which 30 will connect. If the coil is not activated, 30 will always be connected to 87a. You can think of this as the switch in OFF.

How do you tell which pin is which on a relay?

Every relay has a coin the white one which when energized activates the contacts. So of all the pins

Are all 5 pin relays the same?

The only thing they have in common, absolutely certain and guaranteed, is that they have 5 pins. Though it is likely, but not absolutely guaranteed, that 2 of these are the coil and the 3 others are the common, normally-closed, and normally-open contacts of a single-pole double-throw switch.

How does a 8 pin relay work?

State it has to beat the energized. So if it's the energized that means power is actually rolling

Can a relay switch from 30 to 87?

Terminals 30 and 87 are electrically equivalent - the circuit will work the same, regardless of which way they are connected. The connection from terminal 87 to 86 goes through the thermal switch, so the switch will control the fan.

Can 30 and 87 be switched on a relay?

If your relay is a SPDT “changeover” relay, you can independently jumper 30 to 87 and then 30 to 87a to manually test the turn-on of both high-current loads.

What is terminal 85 on a relay?

Terminal 85 - Connect to a suitable earthing point on the vehicle chassis. Terminal 30 - From +12V ignition switch IGN position. This supply also feeds the other side of the momentary switch. Terminal 87 - To terminal 86 and Relay 2 terminal 86.

Does polarity matter on a relay?

If the polarity is reversed, the built-in diode will short-circuit, damaging not only Relays, but possibly also power supplies.

Is it OK to use a higher amp relay?

Never use a Relay for a load that exceeds the contact ratings of the Relay, such as the switching capacity. Doing so may result in reducing Relay performance for insulation failure, contact welding, and contact faults, and might even result in burning or other damage to the Relay itself.

Can a relay short to ground?

No, you will not be shorting the battery. The relay COIL, for a 12V relay, is designed so that when it's energized (i.e. connected between 12V and ground) will only pass enough current to close the relay contacts.

Why does a relay have 3 pins?

A normally closed relay will switch power OFF for a circuit when the coil is activated. 5 pin relays provide 2 pins (85 & 86) to control the coil and 3 pins (30, 87 & 87A) which switch power between two circuits.

What does 87A mean on a relay?

87a. High current (load) Output to other device, normally closed, pulled open when coil is energized.

Are all 12 volt relays the same?

The problem is, not all relays are the same. Many relays, if installed for the wrong application, could and will cause a short (Internal Relay Circuit) and most likely cause functionality issues or even damage to the vehicle computer systems.

How do you test a 5 prong relay?

And then I'm going to supply power to pin number 86. Now when you do this you have to hear it click

Can I use a 5 pin relay instead of a 4 pin?

Some 5 pin relays are SPDT (switch between the two pins) and some are DPST (like the main relay- connect 2 pins at the same time.) If you want to use a 5 pin in place of a 4 pin, you shouldn't have to remove the pin. The socket should be the same, but the center pin won't have a contact in it.

What would you use a 5 pin relay for?

And what we typically use them for is we are connecting them to a power source. So instead of using

What is relay principle?

Relay works on the principle of electromagnetic induction. When the electromagnet is applied with some current, it induces a magnetic field around it. Above image shows working of the relay. A switch is used to apply DC current to the load.

What is the difference between 8 pin and 11 pin relay?

In an 8 pin relay (as shown here) there are 2 common contacts, 2 normally open contacts, and 2 normally closed contacts. In an 11 pin relay, there are 3 of each of the aforementioned. These contacts are made of an electrically conductive material such as copper.