What is 30 and 87 on a relay?
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. Think of this as the relay in the Normally Closed (OFF) position. When current is applied to the coil, 30 is then connected to pin 87.
What does 87 mean on a relay?
Relay Guide
| Terminal/Pin number | Connection |
|---|---|
| 85 | Coil |
| 86 | Coil |
| 87 | Normally Open (NO) |
| 87a | Normally Closed (NC) – not present on 4 pin relays |
What is number 30 on a relay?
Terminal 30 is connected to the battery. So when the electromagnet pulls the two internal switch contacts together, current flows from terminal 30 out terminal 87, which is connected to the device we want the relay to control, in our case an electric motor. Since the motor is grounded, this causes the motor to turn on.
What does 85 and 86 mean on a relay?
Output for a Relay. Realizing that 85 and 86 are the coil pins, these pins will be transferring the current through the coil. 85 will be used to ground your relay, while 86 will be connected to the switchable power.
Do I need a 4 pin or 5 pin relay?
The difference between a 4 and 5 pin relay is that a 4 pin relay is used to control a single circuit, whereas a 5 pin relay switches power between two circuits. 4 pin relays use 2 pins (85 & 86) to control the coil and 2 pins (30 & 87) which switch power on a single circuit.
What does 31 mean on a wiring diagram?
DIN 72552
| Contact | Meaning | Old terminal designation |
|---|---|---|
| Ignition system | ||
| 31 | return to battery- or direct to ground | |
| 31a | return to battery- 12/24 V relay | |
| 31b | return to battery- or ground through switch | 85d |
What is pin 87A on a 5 pin relay?
5 Pin Relay 5 pin relays provide 2 pins (85 & 86) to control the coil and 3 pins (30, 87 & 87A) which switch power between two circuits. They have both normally open and normally closed connection pins.
What is a 32 relay?
32 Directional power relay A relay that operates on a predetermined value of power flow in a given direction or upon reverse power flow, such as that resulting from the motoring of a generator upon loss of its prime mover.
Can I replace a 4 pin relay with 5 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 is 30 on a wiring diagram?
The central/relay panel is indicated in gray at the top of the wiring diagram page. The cen- tral/relay panel includes common power cir- cuits, such as battery power (30), ignition switched power (15), load reduction (75/X), and Ground (31).
What does +30 mean on wiring diagram?
DIN 72552
| Contact | Meaning | Old terminal designation |
|---|---|---|
| Ignition system | ||
| 30 | from battery+ direct | 30/51 |
| 30a | from 2nd battery and 12/24 V relay | |
| 31 | return to battery- or direct to ground |
What is a 50 51 relay?
50/51 and 50/51N relays. Overcurrent relays are the most commonly-used protective relay type. Time-overcurrent relays are available with various timing characteristics to coordinate with other protective devices and to protect specific equipment.