Digital cyclic timer for DIN-rail TDT4-2L/12-24V

T=(0.1sec ... 9999min), Us=12÷24V ac/dc, Output 4A/220V, 86x70x58mm

Price 46.28 EUR no VAT

The TDT4-2L/12-24V digital cyclic timer for DIN-rail mounting is a microprocessor device. Three main parameters are set: "Ton" - the time of ON-state of the output relay; "Toff" - the time of OFF-state of the output relay; "C" - number of cycles. The cyclic timer can be started in three ways: a) by turning on the supply voltage; b) by pressing a button of the front panel of the counter; c) by using an external button or sensor connected to the timer. The time-relay has an energy-independent. Programmatically can be set other parameters defining the operation of the timer.


The TDT4-2L digital cyclic timer is designed for mounting on an M35 DIN-rail. It is a compact device based on a microprocessor. It serves to commutate direct current and alternating current electric circuits. The time of the on state "Ton" and the time of the off state "Toff" of the output relay are programmatically set in digital form. One cycle is equal to the sum of the times "Ton" and "Toff". It is possible to set arbitrary number of cycles "C", after counting of which the timer turns off and goes to the starting position. It is used widely in automation of production, technological and other processes.


Digital indication, LED - red 4 digits, h = 14mm (height)
Time range, Ton ( Toff ) 0,1 sec … 9999 min
Number of cycles, C 0 ... 999
Supply voltage, Us 12÷24V ac/dc (11÷31Vdc / 11÷27Vac)
Power consumption, P 2 W (85 mA)
Output - Relay (NO+NC) 4A / 220VAC
Error counting time ±0,05 %
Operating temperature, Tamb -20º...+50º C
Degree of protection IP40
Joining Terminal block
Overall dimensions 86x70x58 mm, DIN35-70

Programmable parameters

Range of parameter  Ton :
      0,1÷999,9 sec 0.1''
      1  ÷  9999 sec 1.0''
      1  ÷  9999 min 1.0’
Parameter  Ton   (time of switched on state the output relay) 0.1.÷ 999.9.  (1. ÷ 9999.)
Range of parameter  Toff :
      0,1÷999,9 sec 0.1''
      1  ÷  9999 sec 1.0''
      1  ÷  9999 min 1.0'
Parameter  Toff   (time of out-of-work state the output relay) 0.1 ÷ 999.9  (1 ÷ 9999)
Number of cycles  C  (0 - infinity) 0 ... 999
Interruption of the supply voltage  Us :
      - after an interruption, the reading continues from the current data Cont
      - after an interruption, the reading automatically starts from the beginning Full
      - after an interruption, a stop mode of the current data is established Ucc
      - after an interruption, the timer is reset Goto
Automatic start when the power is turned on for the first time no / Auto
Initial starting of the timer,  St  ( Ton / Toff ) ⌈‾⌉  /  ⌉_⌈

Timing diagram of the TDT4-2L timer

Diagram of TDT4-2 and TDT4-2L timers

Timing diagram of the output relay (“NO” - normally open contact)

Schemes of connection

Scheme of connection of NPN sensor to timer TDE4-3L and TDT4-2L


Starting the timer with NPN sensor

Scheme of connection of the start button to the TDE4-3L and TDT4-2L timer


Starting the timer with switch K2

Overall dimensions (mm)

Overall dimensions of the DIN-70 housing of the controller for rail mounting

Short description

The TDT4-2L digital cyclic time relay is an electronic device used as a means of automating production processes. Used for switching direct current and alternating current electrical circuits.

Typical parameters of TDT4-2L timer

TDT4-2L / 12-24V11÷31VDC / 11÷27VAC2W (85mA)
TDT4-2L / 220V220VAC ±10%4W (16mA)