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what is a timer???

Navigasi - Timer / TDR (time delay relay) is an electrical component / spare part on industrial machines that serves to set the time for both its operation and deactivation.

In other words, the timer function is useful for controlling the time to disconnect or connect the electric current.

If we look at its function, it is the same as relays and contactors which function to disconnect and connect electric currents, the only difference being that the working system is added to the timing.

Timer spare parts are divided into two components, namely the timer socket and the timer itself. If one of these spare parts (components) is not available, you can be sure that your timer cannot be used.

Therefore we will explain it to you along with the picture which we have summarized from various sources as below.

Component parts of TDR (time delay relay)


The components contained in a timer include the following:

Timer (TDR)


Timer is the main component that we use to set the time to disconnect or connect electric current.

As for the timer itself is divided into two types, namely:


Digital and analog timer
Digital and analog timer 



  1. Digital timer
  2. Analog timer (manual)

If we look at the practicality and accuracy of the digital timer, it is far superior, you can set the time easily and more accurately and we can see the time indicator from the display of numbers on the LED. The only drawback of digital timers is that they are much more expensive than analog timers.

While analog timers are cheaper than digital timers, but the timing is sometimes less accurate and if to see the working time limit of the timer you only rely on the LED indicator light in front.

Timer socket


The timer socket or there is also a timer slot which functions as a timer holder and to connect or connect an electrical control circuit to each timer.

As for the type or model, you have to adjust to the number of timer legs that you are using. One example of a timer slot can be seen in the image below.

Soket timer
Timer socket


Which in the picture above shows the functions and uses of slots or connections on each leg of the timer, namely:

Timer coil

While applying to industrial machines has commonly used, especially when you use an automatic star delta electric circuit. NC Timer
In the picture above you can use the timer coil in timer slots number 2 and 7 which you just have to install with 220 volts of phase and zero electric current.

Input power


The input power if we look at the picture above is shown in the timer slots number 1 and 8 which you just need to connect to the electric phase which will connect to the NC or NO timer leg slot.

Input power some people call it power input but in essence its function is to provide electric current to the legs of the NC and NO timers.

NO timer


The NO timer is located in the timer leg slots number 3 and 6 which is when the timer has not reached its limit if you are a tester or test pen, the electric current has not been connected to the Power Input timer.

Meanwhile, if the timer timeout has shown the setting time, NO will be connected by the Power Input timer, so the electric current will flow in the NO timer leg slot.

NC Timer



While the NC timer is the opposite of the NO timer function, where when the timer has not reached its limit, the NC timer will be connected to the Power Input timer if you test it.

If the time limit has been met, the NC timer will be disconnected with the Power Input timer so that the electric current will be cut off to the NC timer.

As for applying to industrial machines, it has been commonly used, especially when you use an automatic star delta electric circuit.

that's a few things about the timer, an electrical component that is often used in industrial machines, thank you for visiting and hopefully useful.
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