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A timer relay is an essential component in industrial and commercial settings, acting as a control relay with a built-in time delay function. These devices combine the functionality of an electromechanical output relay with a control circuit, allowing contacts to open or close at specific intervals before or after a pre-selected time period. Whether for operations spanning mere milliseconds or extending over several days, timer relays ensure precision and reliability in timed functions. They are available in configurations of normally open or normally closed, making them versatile for various applications requiring timed delay.

## **What is the Difference Between Timer Relay and Mechanical Relay?**

The difference between a mechanical relay and a timer relay lies in the timing of contact operations. In standard mechanical relays, contacts are opened or closed immediately when voltage is applied or removed from the coil. Conversely, timer relays introduce a deliberate delay, opening or closing the contacts either before or after a preset time period has elapsed. This feature is crucial when precise control over timing is necessary for your applications. Understanding this difference is vital for selecting the appropriate relay type, depending on whether immediate action or a time delay is required for tasks such as process control, safety mechanisms, or sequential operations.

## **What Are the Types of Timer Relays?**

Timer relays come in various types, each designed to meet specific timing functions crucial for diverse applications:

### **On Delay**

The On Delay Timer Relay starts its timing sequence upon the application of voltage. It is commonly used where machinery or systems require a predetermined warm-up period before initiating the next process stage.

### **Off Delay**

With Off Delay Timer Relays, the relay remains ready to receive a trigger as soon as the voltage is applied. The timing only starts once the trigger is released, allowing continued operation of devices for a set period after turning off the main power, useful in cooling down operations.

### **Single Shot**

Single Shot Timer Relays operate by providing a one-time, brief contact closure following a predetermined delay after voltage application. This type is ideal for tasks that require a single, precise action.

### **Interval On (Interval) and Flasher (On First / Off First)**

Interval On Timers alternate between on and off states for specific durations, useful in cyclic operations. Flashers, similarly, provide repeated on-off cycles, with adjustments possible for the duration of the initial state, whether on or off.

### **Repeat Cycle**

Repeat Cycle Timer Relays alternate between on and off states upon voltage application, starting the timer immediately. This relay type is essential for continuous processes requiring regular intervals.

Each type of timer relay serves distinct purposes, making it essential to consider the specific needs of your operation to select the most suitable model.

## **Design Considerations**

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 [Electrical Relays Guide](https://nz.rs-online.com/web/content/discovery/ideas-and-advice/electrical-relays-guide).

## **Triggering Mechanisms**

Understanding how timer relays are triggered is essential for proper integration and functionality within your systems:

- **Voltage-Triggered:** Most timer relays are activated when a specific voltage is applied. This method is straightforward and reliable, suitable for a wide range of applications where the timing needs to start as soon as power is supplied.
- **Signal-Triggered:** Alternatively, timer relays can also be initiated by a signal — either from a manual switch, a sensor, or another control system. This type of triggering allows for more complex and conditional operations, such as starting the timer based on external events or conditions rather than just the application of voltage.

These mechanisms can be used independently or combined, depending on the complexity and requirements of the application. Choosing the right triggering mechanism is crucial for achieving the desired operational accuracy and efficiency.

## **Applications of Timer Relays**

Timer relays are typically used in numerous industrial and OEM equipment applications, playing a pivotal role in [enhancing operational efficiency and safety](https://nz.rs-online.com/web/content/discovery/ideas-and-advice/machine-safety-guide):

- **Lighting Circuits:** They are used to control the timing of lights, ensuring that lighting systems operate only when needed, which can significantly reduce energy consumption.
- **Motor Start Control:** Timer relays help in managing the sequence and timing of motor starts, preventing simultaneous starts which can lead to power surges and equipment stress.
- **Sensitive Equipment:** They provide controlled timing for the operation of sensitive equipment, protecting devices from damage by ensuring that they operate within safe time parameters.
- **Safety Control:** In safety systems, timer relays delay actions to ensure that all safety conditions are met before machinery is activated or deactivated.
- **Conveyor Belt Sequence Delay:** They regulate the timing of conveyor belts in manufacturing processes, ensuring smooth transitions and preventing bottle-necks or jams.

## **Shop High-quality Timer Relays for Your Industrial Needs Today!**

RS is your trusted supplier and distributor of high-quality timer relays, catering to a wide range of industrial needs. Our extensive selection features brands like Omron, Schneider Electric, and Siemens, ensuring that you find the perfect fit for your specific requirements. Whether you're upgrading existing systems or designing new installations, our timer relays provide the reliability and precision your operations demand.

## **Ordering & Delivery Information for New Zealand**

RS ensures prompt delivery of relays and signal conditioning components including[power relays](https://nz.rs-online.com/web/c/relays-signal-conditioning/relays/power-relays/) and [solid state relays](https://nz.rs-online.com/web/c/relays-signal-conditioning/relays/solid-state-relays/) across New Zealand. For more details on our delivery options, timeframes, and associated costs, please visit our [Delivery Information page](https://nz.rs-online.com/web/content/support/all-articles/delivery).



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