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I want to manually flip a switch to connect and disconnect a 10 μF capacitor from my microcontroller's reset pin in my industrial application where everything is mounted on DIN rails. The cap is already in its own DIN rail-mount housing, but it draws very little current at a low voltage.

I thought it would be easy to simply use a low-current breaker, but even the 1 A model I found is not allowing the capacitor to charge at all. This literally can be the simplest of all electronic components: a switch, but I can't find anything low-profile that mounts on DIN rails. I had the idea to mount something like a rocker switch onto a DIN rail bracket, but I would prefer to buy an off-the-shelf unit.

Breaker I bought that does not seem to work for this low-voltage, low-current, DC application:

ASI NDB2-63C1-1 DIN Rail Mount Circuit Breaker

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  • \$\begingroup\$ you could try these "toggle" button relays in din format, these devices they use for lighting and so. they are plain mechanical relays with a slight twist so they don't use current during the on state. \$\endgroup\$
    – NaturalDemon
    Commented Feb 9, 2023 at 20:49
  • \$\begingroup\$ Hi @NaturalDemon can you provide a link? \$\endgroup\$
    – AnalogDigital
    Commented Feb 9, 2023 at 20:57

3 Answers 3

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I ended up finding an off the shelf solution (Part number ESG290T/2). The unit I purchased is assembled in the US. The original Nader switch was only about $10 so I was hoping to find something in the same price range but the model I found is about 3X the price at $32. In this case I think the price is warranted because it is assembled locally by a small business. Here is the link if anyone happens to need one: https://esgllc-usa.com/product/toggle-switch-terminal-with-led/

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I would buy a DIN rail-mount enclosure for a few dollars and just drill out the front panel for a switch. If you want to get really fancy, some manufacturers will sell a matching PCB that you can put a terminal block on.

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  • \$\begingroup\$ This is a good idea but I was hoping to avoid a "manual" solution with multiple parts in case I need to make the unit another 10 or even 50 times. Even if it just takes 15 minutes to properly assemble 1 unit, doing that so many times would not be optimal. \$\endgroup\$
    – AnalogDigital
    Commented Feb 9, 2023 at 20:59
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    \$\begingroup\$ If you search "DIN-Rail Mount Miniature Toggle Switches" you'll find some options. \$\endgroup\$
    – vir
    Commented Feb 9, 2023 at 21:12
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    \$\begingroup\$ thanks, I believe you had the solution, although pricey, that is exactly what I was looking for mcmaster.com/7218K24 and automationdirect.com/adc/shopping/catalog/relays_-z-_timers/… \$\endgroup\$
    – AnalogDigital
    Commented Feb 10, 2023 at 16:03
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look for: bi stable relay, latching relay or maybe pulse relay, these are electromagnetically en don't consume power, a wheel with notches inside is rotated via a coil on a button push and makes or brakes the contact.

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