You will notice that on the type b layout pins 86 and 30 are swapped over compared with the type a layout.
Micro relay 4 pin diagram.
Relays switches are used to open and close circuits electromechanically or electronically.
Micro relay https goo gl mswg6s see a complete list of parts products tool.
Look for relay diagrams or a relay schematic that is printed on the side of the relay to determine it.
Note that each pin is numbered.
If the coil is not activated 30 will always be connected to 87a.
Looking at the diagram we see the pinout of a typical 12v relay.
The most common relays used to control electrical accessory devices in the automotive industry are iso mini and micro relays.
Numbers of a relay.
The iso defines this type of relay as 1 inch 2 5 cm by 1 inch 2 5 cm by 0 5 inches 25 4 mm by 25 4 mm by 12 7 mm.
4 pin relay 4 pin relays use 2 pins 85 86 to control the coil and 2 pins 30 87 which switch power on a single circuit.
Here we look at relay switch pin diagram and the different kinds of relay switches.
Normally open or normally closed types.
In this video i show you how to wire a micro 12 volt automotive style relay.
85 and 86 are the coil pins while 30 87 and 87a are the contact pins.
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.
Relay diagrams pirate4x4.
Determine that the relay is an iso micro type.
4 and 5 pin designs spst spdt are used in both styles of automotive relays.
When a relay contact is closed there is a closed contact when the relay is not energized.
These layouts are shown on the two 5 pin relays below pin 87a not present on 4 pin relays.
87 and 87a are the two contacts to which 30 will connect.
The automotive iso mini relays we have been looking at above are typically available in two types of pin layout designated type a and type b layouts.
4 pin high capacity normally open mini relays stock code description type protection wiring diagram 6646b p141270x 12v 70a diac 1 form a 30 87 9 5mm american 87 30 86 85 30 86 85 87 5 pin changeover mini relays stock code description type protection layout wiring diagram 6608b p2512r 12v 30 20a resistor e 1 form c.
An iso micro relay has the control circuit connected to pin 86 and pin 85 and the load circuit connected to pin 30 and pin 87 or 87a.
Ehdis car truck relay socket harness kit 4 pin 4 pre wired 12v 40 amp spst bosch style automotive auto switches starters set pack of 2 4 5 out of 5 stars 41 11 69 11.
