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Electronic timing relays are used in contactor control systems which require short reset times, high repetition accuracy, high switching frequency, and a long component lifespan. Times between 0.05 s and 100 h can be easily selected and set.
The switching capacity of electronic timing relays corresponds to the utilisation categories AC -15 and DC -13.
In terms of the actuating voltages there are with timing relays the following differences :
The functions of each of the timing relays are as follows:
- DILET11, ETR4-11,ETR2-11 Function 11 (on-delayed)
- ETR2-12
Function 12 (off-delayed) - ETR2-21
Function 21 (fleeting contact on energisation) - ETR2-42
Function 42 (flashing, pulse initiating) - ETR2-44
Function 44 (flashing, two speeds; can be set to either pulse initiating or pause initiating) - Multifunction relays DILET70, ETR 4-69/70 Function 11 (on-delayed)
Function 12 (off-delayed)
Function 16 (on- and off-delayed)
Function 21(fleeting contact on energisation)
Function 22 (fleeting contact on de-energisation)
Function 42 (flashing, pulse initiating) - Function 81 (pulse generating)
Function 82 (pulse shaping)
ON, OFF - Multifunction relays ETR2-69 Function 11 (on-delayed)
Function 12 (off-delayed)
Function 21 (fleeting contact on energisation)
Function 22 (fleeting contact on de-energisation)
Function 42 (flashing, pulse initiating)
Function 43 (flashing, pause initiating)
Function 82 (pulse shaping) - Star-delta timing relays ETR4-51
Function 51 (on-delayed)
With both DILET70 and ETR4-70 an external potentiometer can be connected. Upon connection, both timing relays automatically recognize that a potentiometer is fitted.
The ETR4-70 has a special feature. Equipped with two changeover contacts which can be converted to two timing contacts 15-18 and 25-28 (A2-X1 bridged) or one timing contact 15-18 and a non-delayed contact 21-24 (A2-X1 not bridged). If the link A2–X1 is removed, only the timed contact 15–18 carries out the functions described below.
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