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I have a question regarding the manual type relay switch shown in the picture.

I need relay with dual coil-latching, I thought of using avmomentary toggle SPDT to turn the relay on and off, but I will not know the position of the lever of the switch (whether it is set or reset.) If I use a relay with a built in manual switch which is on the top of the relay, is it possible to set and reset the relay using that without needing any external momentary switches? If I use the normal one then I would need an additional digital latch or flipflop.

Please let me know if I can the manual switch type relay and also let me know if there are any disadvantages with the manual type relay switch.

FYI: Relay - ADJH23112 enter image description here

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  • \$\begingroup\$ You haven’t provided very much information about your application. Not convinced you couldn’t replace the relay with a light switch. \$\endgroup\$
    – Pat
    Jan 15, 2021 at 14:39

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The manual lever, which serves as a test button to carry out checks during installation, is not intended for normal use. It will neither set nor reset the relay.

I suppose a toggle switch or an MCB would be a better choice for your application.

But if I use the SPDT momentary toggle switch to set or reset then I would not be able to know which state it was triggered last. Do you have any simple circuit suggestion for this? Like any kind of indicator which says it was in set or reset position?

An indicator lamp 'H1' in the load circuit would do.

enter image description here

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  • \$\begingroup\$ Thank you for your answer. But if I use the SPDT momentary toggle switch to set or reset then I would not be able to know which state it was triggered last. Do you have any simple circuit suggestion for this? Like any kind of indicator which says it was in set or reset position.? \$\endgroup\$ Jan 15, 2021 at 13:45
  • \$\begingroup\$ It's worth pointing out that there are manual switches that can also be electrically actuated via a solenoid. \$\endgroup\$
    – Hearth
    Jan 16, 2021 at 5:31
  • \$\begingroup\$ @Hearth, Many thanks for the information. \$\endgroup\$
    – vu2nan
    Jan 16, 2021 at 9:57
  • \$\begingroup\$ @vu2nan, are you sure that the manual lever wont set or reset the relay? I am confirming this because, few answered me that it is like a normal switch where we can set or reset. I just want to make sure \$\endgroup\$ Jan 16, 2021 at 17:24
  • \$\begingroup\$ @vu2nan, But the load is switching at 400V AC and 40A rms so I dont think lamp would do the job \$\endgroup\$ Jan 16, 2021 at 17:26

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