What are Timer Relays?
Timer relays, also known as time delay relays, are electrical devices designed to introduce a delay in the operation of a circuit. They are commonly used in various industrial and automation applications where precise timing control is required. Timer relays are capable of controlling the timing of events in a system, such as turning on or off a device after a specific time interval.
Types of Timer and Delay Relays
Timer relays come in various types, each designed for specific timing functions and applications. Here are some common types of timer relays:
- On-Delay Timer Relay (Delay-On-Make): The relay activates after a set delay when the input signal is applied.
- Off-Delay Timer Relay (Delay-On-Break): The relay remains active for a set duration after the input signal is removed.
- Interval Timer Relay: Combines characteristics of both on-delay and off-delay timers.
- Multifunction Timer Relay: Provides multiple timing functions in a single unit.
- Pulse Timer Relay: Generates a single pulse of a specified duration when triggered.
- Repeat Cycle Timer Relay: Alternates between on and off states at regular intervals.
- Symmetrical On/Off Timer Relay: Provides separate settings for on and off times
- Star-Delta Timer Relay: Specifically designed for controlling the star-delta starting of electric motors. Helps reduce the inrush current during motor starting.
- Cyclic Timer Relay: Repeats a cycle of on and off states with a fixed time period for each cycle.
- Digital Timer Relay: Utilizes digital technology for precise and programmable timing functions.
- Astro Timer Relay: Takes into account the time of day or astronomical conditions for activation. Commonly used for outdoor lighting control based on sunrise or sunset times.