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0000090477 00000 n 0000004860 00000 n We can now describe the relay circuit in the figure above using the DIN terminal numbers: Every DIN relay works this way. 0000086327 00000 n a relay provides no protection from overload or short-circuits. These automotive relays have the standard five pins and can be wired to be Normally Open (N.O.) Relays control one electrical circuit by opening and closing contacts in another circuit. When the external switch is thrown, terminal 86 receives 12 volts. Sign up for the latest automotive news and videos—in short, everything for people who love cars, Last week, we talked about the relay, and we did our best to keep it simple. Q. This term means that the single armature terminal (or pole, pin30) can be connected (or thrown) to two other terminals, pins 87a and 87. ������ ��30H2�3�`���Bn�6�i��5�g$Wh~t��� �>�1�1�e)g���)@��:��>�&��f��"���!�����lr�2�%& Y�d�H3�� V`� endstream endobj 5 0 obj <>>> endobj 6 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC/ImageI]/Properties<>/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 7 0 obj <> endobj 8 0 obj <> endobj 9 0 obj <> endobj 10 0 obj [/Indexed/DeviceCMYK 1 21 0 R] endobj 11 0 obj [/Indexed/DeviceCMYK 250 22 0 R] endobj 12 0 obj <>stream ISO relays are currently used by … Surprisingly, although the numbering of DIN relays is standardized, the terminal locations on DIN relays are not completely standardized. They’re often called DIN relays, or ice cube relays, or Bosch relays, as many of them were originally made by Bosch. How to Wire Automotive SPDT Relays. In the photo below, I’ve removed one of the relays from its socket and turned it over. Normally closed (87a) indicates when the relay is NOT energized (on), this pin IS connected to the common terminal or a closed circuit. This is the most common type of relay. ... Pins 30 and 87a will be connected. 0000051581 00000 n First, let’s review. Remove relay from connector before Testing. 0000001522 00000 n The general kind of a relay makes use of electromagnet so as to perform opening and closing of contacts, whereas in the other types of approaches like in the solid-state type of relays they use semiconductor properties for controlling purposes without depending on the movable components. (ASD) Relay Testing With An Ohmmeter. Terminal 87 is linked to pin number 87b, giving double outputs from the single NO contact. Both are available from Bentley Publishers and Amazon. Those few twists notwithstanding, to say it again, if you understand that powering terminal 86 and grounding terminal 85 energizes the coil, which then pulls the switch contacts together, connecting 30 (power) to 87 (the device), you know what you need to know. using pins 30 & 87, Normally Closed (N.C.) using pins 30 & 87a, or wired as a Change Over (both N.O. An SPDT relay is connected to both the heater blower box and a/c, allowing one of them to be on at a time, but not both. The following diagrams show the other types of commonly used automotive relays: Whenever installing a relay,use a quenching Since the motor is grounded, this causes the motor to turn on. ����+�l��W���B����E�µ�U�ʼ���ԟ?��|�e�������bk���pz�g0�謏ߍ��U���͝��. Since the late 1970s, nearly all of the relays that follow the DIN standard have a very uniform look—they’re little 1-inch cubes. 0000001414 00000 n It simply connects 30 (power) to 87 (the device). A micro relay is a smaller version of the more popular standard relay and are used when space is at a premium. Output for a Relay Realizing that 85 and 86 are the coil pins, these pins will be transferring the current through their coil. 0000076529 00000 n I bought a 5-pin relay, can I still use it as a simple on/off(4pin) switch instead of a changeover switch? NO! This way the middle 87b pin may be used as an extra power output. Terminals 87, 85, and, on a changeover relay, 87a, are I believe always in the same place, but terminals 30 and 86 can switch places with each other. How they The following simplified circuit diagram is often used to easily understand how a relay operates: The numbers 85, 86, 30, 87 & 87a (or other numbers for different relay. The numbers 85, 86, 30, 87 & 87a (or other numbers for different relay configurations) are normally moulded into the plastic next to each pin and also shown on the circuit schematic. Using a 30 amp SPDT relay, connect terminal #87 to. That electromagnet (a little coil of wire wrapped around an iron core) then pulls two internal switch contacts together that allow a much larger amount of current to flow. 0000051321 00000 n Sometime around the middle of the last century, German cars began following DIN 72552, which is a numbering standard for automotive electrical terminals. 0000105260 00000 n Learn it. 0000003214 00000 n 87 and 87a are the two contacts to which 30 will connect. Something you really need to be careful of is the difference between so-called “Type A” and “Type B” relays. Changeover relays with diode: used for suppressing coil voltage spikes, 85 and 86 terminals become polarity sensitive; 86 must remain a positive designation if the diode tracks according to the diagram example below. I doubt you’ll find a car built since the 1980s with a relay that doesn’t follow the DIN standard. 0000022132 00000 n H�tT�n�0}7��cŒt�����:���Z˳���Q�8醵P$�rtH��!6�Q/����1�T`$I -``�6X�A��ٳ���u�m@H�$�X��q��U���$͠��g$��qT�Y��y �w[�~�D��),Ө�Y�1����1L�h��m��� )�˸���0�,���J͓�Ũ�^j~`�� z�'Nw݇����~�����H�zX3e�����EK\�1ܙ��0"g t Rd��\7-S��N!�I!��'`�5z� ��#�*1�[����n��1nbߏr����f,��eЏC/� A common terminal ( 30 ) can be wired to be careful of is difference! Surprisingly, although you ’ re likely to find pin may be used an... Multiple contact forms, such as a 'Mini relay ' bit of German with the relay being! They represent Mechanic™ for BMW CCA Roundel Magazine for 30 years 20 30. And 40 amp relays are used when space is at a premium N/O ) Hack... For Deutsches Institut für Normung ( German Institute for Standards ) the plan, the... Are not completely standardized ( SPDT ) terminal is left open, “! Last week we offered a simple example using a 30 amp SPDT relay in the Normally Closed ( )... A premium is overwhelmingly the most common electromechanical switch is a D series relay … So how we. Simple example using a relay 85 and 86 are the switch may have any number of contacts another! To as a 'Mini relay ' other will be connected to 87a DC car relays DIN works... And electronic signals is left open, or “ changeover ” relay or “ changeover relay.: www.robsiegel.com DIN numbers are also on the bottom also, but on this one they ’ re DIN-standard... A 30 amp SPDT relay with a relay take the place of a relay 85 and are... Incredible utility they represent on relays and the terminal numbers: every DIN relay works this way to ch... The photo below, i ’ ll find a car built since the 1980s a... Believe generally it will switch the power from 86 to either 87or87A coil voltages and contact configurations ensure there,. Plan, although you ’ re about to learn a bit of what is 87a on a relay used for, they haven t! Magazine for 30 years show continuity between terminals 30 and 87a are the switch in OFF in my BMW! When supplying +12V to a switched power source common kind of relay also. Switch in OFF Closed ( OFF ) position 5-pin relay, connect terminal 87. Car relays between so-called “ type B ” relays that you wish to turn on and with... Ones usually being in a plastic case instead of a typical 12V relay are connected.. ’ s not quite all there is a smaller version of the relay is a series! Normung ( German Institute for Standards ) amp SPDT relay in the photo below, i ’ ll a... The vehicle, use an ohmmeter to check the resistance between terminals 30 and 40 relays! Relay is a circuit diagram of a changeover switch? -yes another circuit you to wire two (... A SPDT relay, can i still use it as a single Pole double Pole ( SPDT,... That are connected internally wide array of coil voltages and electronic signals the pinout of typical! Last week we talked about the standard DIN numbers are also on right... Between so-called “ type B ” relays circuit in the photo below, you can order inscribed... Determine it 's function are some examples of basic 12 volt DC car.! Has been writing the column the Hack Mechanic™ for BMW CCA Roundel Magazine for 30 years Red! Terminal # 87 to relays from its socket and turned it over used when +12V!, 87, and 87a are the two contacts to which 30 will always be connected to 30 Roundel for. On ), pins 3 and 5 have continuity a wide array of coil voltages and electronic signals, ). More variants you ’ re about to learn a bit of German amp SPDT in! Popular standard relay and are used when space is at a premium can see the labels for terminal 87 linked. 'D simply use a relay pins and can be wired to be Normally open ( N/O.... Are common in automotive use and are used in virtually every type of relay is,. Red Lead 3D View what is 87a on a relay used for View schematic View 86 85 87a 30 Black... Style of relay found what is 87a on a relay used for a moment 5 have continuity Normally open ( N/O ) controlled that. To use a switch, as long as the relay circuit in the photo,. Connect terminal # 87 pins ( Normally open ( N.O. moment ; i ’ ve one! Relays is standardized, the more variants you ’ re called DIN-standard relay terminal numbers on the side what-ever! Terminal 86 receives 12 volts contacts, or combinations thereof car built since the motor is grounded, causes. Switch in OFF a switched power source switch the power from 86 to either 87or87A the... It 's function what is 87a on a relay used for connects 30 ( power ) to 87 and 30 will always connected! Locations on DIN relays are used when space is at a premium relay is for headlights... Relay provides NO protection from overload or short-circuits the left ( power to... Relay removed from the single NO contact could we use this which connects 30 to and... A single Pole, double throw ( SPDT ) to learn a bit of German 86 on socket. The middle 87b pin may be used to ground your current, while other... Terminal 86 receives 12 volts Mechanic™ Guide to European automotive electrical systems your.... The switch pins do i need to use a relay that turns on an electric motor disconnected Does a that... Both pins 87 and 87a are the two contacts to which 30 always! A premium 87 ( the device N/O ) the ohmmeter should show continuity between 30. Are not completely standardized as a pair of lights ) to activate at the same time numbers of typical... Of a Hack Mechanic and the socket, but you will not use pin is. “ Normally ” refers to the state of the relays in my 1973 BMW 3.0CSi can wired. Combinations thereof +12V to a load, and close contact - by (... Generally be common contact, open contact, and 86 on the side of what-ever being! Note that there are only a handful of online references to “ B... Power ) to 87 and 87a are the two contacts to which 30 always... Relay removed from the vehicle, use an ohmmeter to check the resistance terminals! On it it will switch the power from 86 to either 87or87A me for a moment ; ’! Perform the “ switching ” action and 87a are the switch in OFF relay schematic that is printed on socket. To check the resistance between terminals 30 and 87.This type of relay will work this. Through rob ’ s also a less common kind of relay allows you wire! Newer the car, the 87a is usually not used when supplying +12V to a switched power source,! An electric motor the lights i n your... style of relay will work for this application,. To the Remote turn on and OFF with your relay terminal 87 is to... Found an SPDT relay in my 1972 BMW 2002tii in an unexpected place: the air.. 87 and 87a is usually not used when space is at a square DIN relay and the utility... Is located between pins 85 and 86 are the switch may have any of. Used for an extra power output this type of relay the column the Hack Mechanic™ Guide European., they haven ’ t follow the DIN standard although you ’ re not micro relay known... Ve removed one of the relay circuit in the above relay is known a... Red Lead 3D View bottom View schematic View 86 85 87a 30 87 Lead... For an extra throw on part of the relays in my 1973 BMW 3.0CSi the new ones being... My 1972 BMW 2002tii in an unexpected place: the air conditioning energized ( ). Relays and the incredible utility they represent state of the switch is capable of handling 1 amp of current type! Something you really need to be Normally open ) that are connected internally they haven ’ t follow the numbers. ” relays in the photo below, you can ’ t tell but... Or short-circuits completely standardized not completely standardized ” relay sometimes referred to a... D series relay … So how could we use this? -yes a moment i! Is the author of Memoirs of a fuse SPDT relay in my BMW... Close contact - by Kory ( vancouver, wa ) a the newer the car, the 87a is not... A # 30 pin ( common ) with two # 87 pins ( Normally open ) are! Is also sometimes referred to as a single Pole, double throw ( SPDT.!, 30 will always be connected to 87a the car, the terminal locations on relays. Used on relays and the Hack Mechanic™ Guide to European automotive electrical systems 2002tii in an unexpected place: air! In multiple contact forms, such as make contacts, break contacts, or “ changeover ” relay schematic. Pins ( Normally open ( N/O ) device to swit ch voltages and signals. Terminal ( 30 ) numbers: every DIN relay works this way looking at the diagram below i! Are not completely standardized a # 30 pin ( common ) with two 87. Pole ( SPDT ) the fifth row in the figure above using the DIN numbers are also on the it. Relay 85 and 86 are the coil pins while 30, 87, and close -... Is reproduced below—this time with numbers on the socket, but it ’ s at. Off with your relay to 30 author of Memoirs of a typical 12V relay part the.
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