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TDR-MC: Momentary Variant of Time-Delay Relay with Cancel Function

Status: Units are built to order - Please expect up to 2-week delay after receipt of order until order is shipped


This variant of the Time-Delay Relay operates much like the regular TDR-M: when it is triggered by one of the inputs, it waits for the programmed turn-on delay, then turns on. Then, it immediately starts the countdown for the programmed turn-off delay, and turns off, even if the input signal is still present. It can then only be turned on again by the input signal turning off and back on again. However, if it's turned on by a short trigger, and then during the turn-off delay, it's triggered again, it will prematurely turn off the output.

Why would you want this? If you want to use a momentary pushbutton switch to turn something on for a fixed time delay, but also want to be able to turn it off prematurely, this relay will do that for you. For instance, you could connect the input to a momentary switch (which is only "on" as long as you hold it down), connect the output to a light, and set the turn-off delay for 1 minute. Pressing the button will turn on the light for 1 minute. But if you want to turn off the light before the 1 minute is over, you can press the button again and it will cancel the light.

This relay also has a selectable long-delay range setting, with a 30-minute maximum delay range. This can be useful if, for instance, you have a cargo truck with a light in the cargo area, and you'd like to be able to turn on this light with a pushbutton, and allow it to turn itself off after 30 minutes if you forget to turn it off manually. It can also be very useful for heated mirrors or a rear defroster, so that you can turn these devices on, and they'll turn themselves off after 15-30 minutes so that they don't overheat.

Wiring these relays is the same as for the standard TDR and TDR-P relays, and there are negative-switching (TDR-MC) and positive-switching (TDR-PMC) versions.

TDR-MC Time-Delay Timing Diagram
TDR-MC Time-Delay Relay Timing Diagram
TDR-MC Time-Delay Timing Diagram with zero on-delay
TDR-MC Time-Delay Relay Timing Diagram
with Turn-On Delay Set to Zero


Item Added!
Positive-Switching Momentary Time-Delay Relay w/ Cancel (TDR-PMC)
Price: $32
Item Added!
Negative-Switching Momentary Time-Delay Relay w/ Cancel (TDR-MC)
Price: $32