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### What are Timer Relays?

A Timer Relay is a control relay with a time delay function built in. They serve as a combination of an electromechanical output relay and a control circuit, in which contacts can be opened or closed before or after a pre-selected timed interval. Relays can be normally open or normally closed and can be used to delay timed functions from milliseconds to hours or even days.

### Timer Relay or Electromechanical Relay?

The difference between the timer relay and electromechanical relay is that when the output contacts open or close. On a conventional Control Relay, the contacts are opened or closed when a voltage is applied and removed from the coil, however, for timer relays the contacts will open or close before or after an intentional time period. When choosing the right Timer Relay, it is important to consider the kind of delay required for your application.

### What are the Types of Timer Relays?

The most common timing function of Delay Relay are:

- On Delay (Time delay starts on the application of voltage)
- Off Delay (When a voltage is applied the relay is ready to accept a trigger)
- Single Shot (One-shot)
- Interval On (Interval) and Flasher (On First / Off First)
- Repeat Cycle (When a voltage is applied the relay contacts change state and the timer starts)

When designing your application, it is important to understand the difference between the types of the Timer Delay Relays, considering what should initiate the delay and if it should start at the same time as the application, as well as when the voltage is released. More information can be found in our [Timer Relays Guide](https://uk.rs-online.com/web/generalDisplay.html?id=info/timer)

**Timer Relays are triggered/initiated by either:**

- Voltage being applied or
- The closing or opening of a trigger signal

### Applications of Timer Relays

Delay Relays are typically used in industrial applications and OEM equipment play an important role for many industrial processes such as small panel or sub-panels requirements.

- Lighting circuits
- Motor start control
- Sensitive equipment
- Safety control
- Conveyor belt sequence delay

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Timer Relays | Time Delay Relays | RS

Timer Relays

RS PRO Plug In Timer Relay 2-Contact 1-Function, DPDT

Siemens 5TT31 Series Timer Relay, 230V ac

Schneider Electric Harmony Relay RXG Series Plug In Timer Relay

Schneider Electric Harmony Time Series Plug In Timer Relay...

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Timer Relays 240V | RS

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Gavazzi Timer Relays | RS Components

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Timer Relay 12V | Timer Relays |RS

<p>A 12V timer relay is an electrical device that combines the functionality of a relay and a timer. It is commonly used to control the timing of an electrical circuit or system.</p><h2>How does a 12V timer Relay Work?</h2><p>The timer relay is powered by a 12V power source, which can be battery or an external power source. The relay has an input terminal that receives a control signal to initiate the timing operation. This control signal can come from a switch, sensor, or any other device that triggers the relay. Timing settings allow you to adjust the timing parameters according to your requirements. This includes setting the delay time, which determines how long the relay stays activated after receiving the control signal. Once the control signal is received, the timer relay activates an internal relay, which switches the electrical circuit or system on or off. The relay output contacts can handle higher currents or voltages than the control signal.</p><h2>Applications</h2><p>A 12V timer relay can be used in a wide range of applications where timing control is required in a low-voltage DC system. Some common applications include:</p><ul><li><strong>Automotive Systems</strong>: Timer relays are used in vehicles for functions such as delay-off headlights, intermittent window wipers, and automatic power window operation.</li><li><strong>Lighting Control</strong>: Timer relays can be used to control the timing of lighting systems, such as outdoor lighting, security lights, or interior lighting in homes, offices, and industrial settings.</li><li><strong>Irrigation Systems</strong>: Timer relays can be used in automated irrigation systems to control the timing and duration of watering cycles for gardens, lawns, and agricultural fields.</li><li><strong>HVAC Systems</strong>: Heating, ventilation, and air conditioning (HVAC) systems often incorporate timer relays for controlling the timing of various components, such as fans, compressors, and defrost cycles.</li><li><strong>Industrial Automation</strong>: Timer relays are used extensively in industrial automation processes, where precise timing is required for controlling equipment, machines, and processes.</li><li><strong>Control Panels</strong>: Timer relays are commonly used in control panels for various applications, including motor control, pump control, conveyor systems, and automated manufacturing processes.</li><li><strong>Security Systems</strong>: Timer relays can be utilised in security systems to control functions like alarm activation and deactivation, delay entry/exit mechanisms, or timed lighting to simulate occupancy.</li><li><strong>Aquariums and Terrariums</strong>: Timer relays are used to control lighting, heating, and filtration systems in aquatic and reptile habitats, providing scheduled day-night cycles and maintaining optimal conditions.</li></ul>

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On Delay Timer Relays | Timer Relays |RS

<p>An On Delay Timer Relay is an electrical device used to introduce a time delay before energizing or de-energizing a circuit. It is commonly used in various industrial and automation applications where timing control is required.</p><h2>How does an On Delay Timer Relay Work?</h2><p>The purpose of an On Delay Timer Relay is to provide a delay between the input signal and the output action. When the input signal is received or a circuit is energized, the timer relay starts its timing cycle. After the pre-set time period elapses, the relay contacts change state, either closing or opening the circuit, depending on the configuration.</p><p>The time delay provided by the relay can be adjusted based on the specific requirements of the application. The delay can range from a fraction of a second to several hours, depending on the timer relays design and capabilities. Some timer relays allow for precise adjustment of the delay time, while others have fixed time increments.</p><h2>Applications of On Delay Timer Relays</h2><p>On Delay Timer Relays are used in various applications, such as motor control, lighting control, sequential control circuits, HVAC systems, and process automation. They can be employed to prevent immediate equipment start-up or to introduce a delay between different stages of a process.</p><p>RS offer a selection of on delay timer relays from leading suppliers, for all of your requirements based on the desired functionality for a particular application.</p>

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ABB Timer Relays | RS

With ABB timer relays, you can have adjustable time delays, multiple timing ranges, and compatibility with different control voltages. As a multinational company known for its expertise in power and automation technologies, ABB offer various series within their timer relays range. Depending on the series and model of the timer relay, the functionalities and features may vary.<h2>What is a timer relay?</h2>Timer relays are specialised devices that integrates timing functions with switching capabilities, enabling you to control the timing of electrical circuits based on time delays, essentially allowing you to turn them on or off after a set period.<h2>What are the two main types of time relays?</h2>The two main types of timer relays are electromechanical or solid-state.<p>In electromechanical timer relays, a clockwork mechanism is used to measure time, which usually involves a spring or motor-driven gears that move at a constant rate to progress through a set period. To set the time periods, this tends to involve using buttons or knobs on the timer relay. Solid-state (electronic) timer relays, however, use electronic components such as resistors, capacitors, and integrated circuits to measure time, which often allow for more precise timing and flexibility in setting different time intervals. Setting the desired time for electronic timer relays is simple, as they may have digital displays and buttons for programming.</p><h2>How does a timer relay work?</h2>Timer relays consist of a timer mechanism and a switching element. The timer mechanism can be mechanical, electronic, or a combination of both, depending on the type of timer relay.<p>Timer relays can be configured as normally open (NO) or normally closed (NC). In the normal state, the relay may have the circuit open (NO) or closed (NC). When the timer completes its countdown, it switches to the opposite state. The choice between NO or NC configuration is dependent on your required application. For example, if you want a device to be activated after a specific time, you may use a NO configuration. Whereas, if you want a device to be deactivated after a specific time, a NC configuration would be appropriate.</p>ABB have got you covered, as they offer single and multi-functional timer relays.<h2>Features and Benefits</h2><ul><li>The automate processes of timer relays allow precision in timing-based operations.</li><li>Optimise energy efficiency through scheduling the activation and deactivation of devises at specific times.</li><li>Protect equipment from overheating through time control.</li><li>Enhance security by integrating a timer relay in your security systems to control alarms, access control devices, and lighting.</li><li>Delay functions are useful to help stabilise conditions before initiating the next step.</li><li>Timer relays provide versatility to meet different application requirements, as they come in various types, such as on-delay, off-delay, interval, and more.</li><li>Save on costs by optimising energy consumption during off-peak hours.</li></ul><h2>Applications</h2>ABB timer relays can be used in many industries and settings where the control of electrical circuits with time-delayed functions is necessary. Some common applications include:<ul><li>Industrial Automation</li><li>Lighting Control</li><li>Pump and Motor Control</li><li>HVAC Systems</li><li>Traffic Signal Control</li><li>Process Control</li><li>Security Systems</li><li>Water and Irrigation Systems</li><li>Appliance Control</li><li>Scientific and Laboratory Equipment</li></ul>

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OMRON Timer Relays | RS

<p>Timer relays are an incredibly useful component in many electrical systems. Simply put they will do one of the following things:</p><ul><li>Delay the energising of a circuit.</li><li>Delay the de-energising of a circuit.</li></ul><p>They use an integrated timer to perform these functions in one or more directions. Timer relays are usually supplied in either open or closed varieties.</p><p>There are 5 main types of timer relay. As well as on and off relays that open or close you will also find one shot relays, repeat cycle relays and interval on/flasher relays. All of these can delay functions for a few milliseconds or several days depending on application.</p><p>Common uses for delay relays are:</p><ul><li>Lighting circuits</li><li>Traffic controls</li><li>Dispensing equipment</li><li>Burglar alarms</li><li>Sprinkler systems</li><li>Lift doors</li><li>Fan controls</li></ul><h2>Why Choose OMRON Time Delay Relays?</h2><p>OMRON are the name to trust for all your electrical components but are particularly known for their electromechanical relays. When you're looking for flexibility, reliability and value for money, OMRON will always have a component that meets your needs.</p><h3>OMRON H3CR Multifunction Relays</h3><p>Omron H3CR timer relays are solid-state multifunctional timers that come in four main varieties:</p><ul><li>H3CR-A – Multifunctional timers</li><li>H3CR-F – Twin timers</li><li>H3CR-G - Star-delta timers</li><li>H2CH-H – Power off-delay timers</li></ul><p>Most of these can be supplied in 8 or 11 pin models for easy fitment. The A range offers incredible flexibility allowing you to keep less timer models in stock. They also have easy sequence checking and simple analogue controls for stress-free operation. The twin timer version can be set with ranges from 0.05 s to 300 h. A full range of accessories is also available. For more information check out the <a href="https://docs.rs-online.com/36ca/0900766b815c01c9.pdf">H3CR Datasheet</a>.</p><h3>OMRON H3Y Series Time Relays</h3><p>The OMRON HY3 series of miniature timers have pin configurations that are compatible with MY Relay. They come in mono and multi-function options allowing you to set a fixed time range or use intervals, flicker-On and flicker-Off modes. They can be set with a short or long time range up to 10 hrs.</p>

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