On-delay timers are also used to stagger starting times for multiple compressors or motors that are activated by the main switch. Input voltage has to be removed to de-energize the output and reset the time delay relay.Īlso referred to as delay-on-operate timers, they are often used for blower motors to delay the operation for a specific time period after a gas, electric, or oil heater has been turned on. The output is energized at the end of the delay. Normally open, on-delay timers start timing when the input voltage (power) is applied. Other types include interval-on-operate, flasher, and repeat cycle timers. On- and off-delay timers represent the most typical time delay relay timers in use. ![]() The type of time delay relay used will depend on the system setup. However, there are multiple types of time delay relays and their timing functions operate differently. The trigger signal may be designed with either a dry-contact control switch, such as a float switch, limit switch, or push button or with voltage. Typically, a time delay relay is triggered either by opening or closing a circuit or by providing an input current. A time delay relay can provide a scheduled window to clear noxious gases from the chamber. For instance, a time delay relay can ensure that items move from one conveyor to another when required to prevent items on a conveyor belt piling up on top of each other.Īs a safety application example, furnaces or other combustion chambers require ventilation is needed to get rid of fumes and avoid the possibility of explosions. Time delay relays may be used to control loads or production processes in a variety of ways. They can also be used to ensure that different parts of a machine start separately at predetermined times, such as: Triggered in different ways, time delay relays can minimize the amount of energy used to start large industrial machinery or to switch lights or machines on and off at specified times. Time delay relays have a time-delay function built in. ![]() ![]() We rely on relays to activate a multitude of appliances, machinery, and equipment ranging from motor vehicles to cell phones to furnace fans and conveyor belts. Relays instruct electrical and electronic devices and machines to activate. Understanding the Function and Fundamentals of Time Delay Relays
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