How to Select a Timer Relay?
As one of the most common types of relays, timer relay plays a very important role in the electrical control system. The principle is to complete the control of the line by keeping the input signal for a certain period of time-that is, "delay effect", and then continue to execute the command of the input model. When choosing a timer relay, the most important factors to consider are the delay range, delay type, delay accuracy and working conditions. For sure, some basic factors will not be ignored, such as the selection of rated operating voltage and rated operating current.
Timer relay selection guide
The rated working voltage Un and the rated working current In of the contact of the timer relay in the corresponding use category represent the ability of the relay contact to switch the circuit. In selecting, the maximum working voltage of the relay can be the rated insulation voltage Ui of the relay. The maximum working current of the relay should generally be lower than the rated heating current of the relay. Normally, a relay is specified with several rated working voltages, and the corresponding rated working current needs to be listed at the same time (the control power can also be listed). This also determines the entire process of the time relay. Afterwards, it goes to the choice of usage category, such as AC or DC. The precautions for the on-off of the coil must also be considered. In the end, there are some specific usage conditions, such as the surrounding environment, temperature, pollution level, altitude, vibration and other factors. It’s very complicated. Please refer to the instruction manual of the specific product for details.
When choosing a product, the first and most important purpose is to be able to use it stably and reliably, and it should be able to ensure its accuracy. The choice of timer relay mentioned above is only very shallow. When selecting a specific model, it is necessary to combine actual conditions and analyze specific issues in detail. However, the most important thing for buyers is to understand what they really need.
For occasions with low delay requirements, electromagnetic damping or air damping timer relays are generally used. For occasions with higher delay requirements, electric or electronic timer relays can be used.
For electromagnetic damping and air damping time relays, the coil current type and voltage level should be the same as the control circuit. For electric and electronic time relays, the current type and voltage level of the power supply should be the same as the control circuit. It is necessary to choose the power-on delay type or the power-off delay type and the contact delay type (whether delayed closing or delay opening) and quantity according to the requirements of the control circuit. In the end, it is required to consider whether the operating frequency meets the requirements.
ATO has Digital Timer Relay, Analog Timer Relay, Programmable Timer Relay, etc. for your choice. They have the advantages of small size, high delay accuracy, long life, stable and reliable work, convenient installation, and large contact output capacity. Therefore, they are widely used in the automatic control of electric drive, sequence control and various production processes.
