Connect relay terminal 87 to the vehicle body or battery negative terminal. You can use a single input from one part of an electrical system (e.g. This is a clever little circuit involving two relays and a momentary switch and is more a of a 'logic' circuit than one used to switch a high current with a low current. Relays can look very similar from the outside so they normally have the circuit schematic, voltage rating, current rating and terminal numbers marked on the body to identify them. 12V Relay 4 PIN Automotive 30AMP 30a Normally Open Contact Fused RY28 + 30a fuse. The momentary switch can be mounted out of sight and acts a simple starter inhibit security device. 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Automotive Relays. Terminal 87 - To terminal 86 and Relay 2 terminal 86. Up to 50% OFF Automotive Relays Range of relays suitable for automotive uses, including SPNO and SPDT. 12V 30A 4 PIN; Normally Open Contact; Detachable Bracket; Applications. to activate one or more relays that then complete one or more other circuits and so carry out multiple functions from one input signal. This has the effect of keeping the coil energised after the button is released (note that whilst the button is pressed there is 0V between terminals 86 and 87). In addition, the terminal numbering is different, using 1, 2, 3, 4 & 5 instead of 30, 85, 86, 87 & 87a. Halfords (HEF554) Relay 12V 30A 4 PIN. All widths will be compatible with the standard female blade crimp terminals of the corresponding sizes. Please view our large selection of automotive relays below. There are several reasons why you might want or need to use a relay: This is the most common reason and useful where an in-line switch or the existing circuit does not have the capacity to handle the current required. Visit our Knowledge Centre for a wealth of useful information, Free UK Delivery on Orders over £100 Standard Delivery only £3.95 *Exclusions Apply, We accept telephone orders Call 01865 236 446, © 2021 12 Volt Planet Ltd. All Rights Reserved. There are other relay designs that are used for some more complex applications in vehicle systems. This circuit is designed to alert you that you've left your lights on by activating a buzzer when you open the driver's door. AMP - TE CONNECTIVITY. This shows the basic internal circuits (including any diodes, resistors etc.) Note: It is important that the new power feed to the driving lights is fused appropriately (see our Knowledge Centre fusing guide). £6.00. 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