ISO Micro Relay 4 pin. ISO Micro Relay 5 pin. ISO Mini Relay 4 pin. ISO Mini Relay 5 pin. ISO Maxi Relay 4 pin. View our ISO relay holders. All rights reserved. Search for products using a part number or keyword, or try one of our other search tools. Please contact us if you are unable to find a product. We often have an equivalent product from a different manufacturer.
Search for fuses using dimensions. View Order Download. Type the QR Code below to view a datasheet. This increase in the number of terminals over the standard 4 or 5 in more simple relays is often necessary because additional connections can be required for the in-built electronics e.
This simple circuit uses the power feed to the headlight main beam bulb as the trigger to energise a relay. The high current circuit in this relay feeds power to the driving light bulb, so every time headlight main beam is selected, the coil is energised and the driving lights operate. Note: It is important that the new power feed to the driving lights is fused appropriately see our Knowledge Centr e fusing guide.
Tip: It is a good idea to use a separate relay for the left and right hand driving lights and have them switched independently from the left and right hand main beams.
This way, if a relay on one side fails the driving light on the other side will still work. Adding a buzzer that warns when you've left your headlights on. 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. If the headlights are on and the driver's door is opened, the door switch will complete the coil circuit which will complete the high current circuit to the warning buzzer.
A warning light could easily be added in parallel to, or used instead of, the buzzer. Also connects in parallel to terminal 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. Once the ignition key is in the IGN position, you press and release the momentary switch and then turn the key to the START position and fire the engine as normal. 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 Terminal 87 also sends power to the coil of Relay 2 which enables the starter motor solenoid connection, ready for when the key is turned to the START position.
When the ignition is turned off the power to the coil of Relay 1 is cut which cuts the power to the coil in Relay 2 and breaks the starter motor solenoid circuit, so the engine cannot be started again without going through the above routine.
The momentary switch can be mounted out of sight and acts a simple starter inhibit security device. This supply also feeds the other side of the momentary switch. Need some hints, tips or guidance on 12V electrics? Visit our Knowledge Centre for a wealth of useful information. Watch our YouTube "how to" guides here. We accept telephone orders Call Relay Guide Overview What is a relay?
Why might I want to use a relay? There are several reasons why you might want or need to use a relay: Switching a high current circuit using a lower current circuit 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. Cost saving High current capacity wiring and switches cost more than lower current capacity versions, so by using relays the requirement for the more expensive components is minimised.
A throw refers to the number of separate wiring paths. For example, a triple throw switch can be connected to one of three contacts instead of one. In an electromechanical relay, a small circuit has the ability to switch a larger circuit on or off through contacts by using an electromagnet.
When charged, the electromagnet creates a magnetic field that attracts the armature and closes the contacts. Some contacts come in different configurations depending on the use of the relay. Electromechanical relays can be broken down into the following distinct categories: general purpose relays, machine control relays and reed relays.
General purpose relays are electromechanical switches that typically function via a magnetic coil. Additionally, they can command currents ranging from 2AA. These relays are sought after due to them having a multitude of switch configurations and being cost-effective. Like general purpose relays, machine control relays are operated by a magnetic coil. Typically used to control starters and other industrial elements, these relays are robust.
While this gives them greater durability, it also means that they are less economical than general purpose relays. However, with additional accessories and functionality, they have an advantage over general purpose relays.
How to Identify a Faulty Relay Though generally reliable, relays can fail like any mechanical component. Use the following troubleshooting steps: Check for voltage at the point where the relay plugs in. If there is none, check the fuse or switch for defects. If there is voltage at the connection point, use the continuity function on the multimeter to ensure a good ground connection on the opposite side of the relay.
If Steps 1 and 2 do not reveal the source of the problem, check the voltage at the point where the relay connects to the battery or other power source. If there is no voltage here, there may be a problem with a fuse or circuit breaker. Finally, ensure that a proper connection exists between the relay and the component by using the continuity function of the multimeter.
If the connection exists, and if the prior steps did not suggest another malfunction, then it may be time to replace the relay. Types of Relays Many types of relays exist, each bringing unique functions to a variety of applications. Some of the broader categories include: Time-Delay Relays Time-delay relays are useful in any situation that requires components to be powered for a set length of time, or when the component must power on or off after a specific delay.
Most time-delay relays can be sorted into one of two broad categories: On-delay timers begin timing when the input is applied, powering the second circuit after a set wait time. This can be used to stagger the powering of multiple components, preventing power surges, or for applications like alarms and warning systems. Off-delay timers wait for a trigger after the input is energized.
Once the trigger is removed, the output is energized, and then it de-energizes after the time delay. Reapplying the trigger resets the delay. These relays can be used to power devices for set intervals, such as in washer and dryer cycles or amusement park rides.
Sequential Relays Sequential relays can be used to power multiple components in turn, typically in a set order. Automotive Relays Relays have almost unlimited uses in automotive applications, and these applications encompass many of the relay types discussed.
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