step modular relay

[333rocky333]

Found one in a home made panel today, any one know what they are please.
It looks like a normal two pole N/O relay but when the front button on it was pressed in, the contacts closed and stayed closed until the button was pressed again, not sure if that was normal or it had been wired up to do that, thanks.

EDIT
I think it may toggle between N/O and N/C each time the coil is energised



http://octopart.com/20.22.8.230.0000-finder-10546527#technical_specs

 

[Taylortwocities]

Found this on RS web site:

Ever needed a relay that turns on from a single voltage pulse and stays on?

What you need is an 'impulse' or 'step' relay that alternates its contact state with each voltage pulse supplied and holds that state until the next voltage pulse arrives.

The Series 20 from Finder is just such a device. With a 16A resistive contact rating, available in both single & double pole formats, and a wide range of coil voltages it's ideal for many applications including:

Lighting Control: Use a single momentary push button and an impulse relay to create push-on, push-off lighting control - Easy.

Door or Gate control: A single pulse from a remote transmitter or entry/exit button to the impulse relay allows a door release or automatic gate to open until a close command is received from the same button. Keeps wiring simple.

Alarm or Security: Many alarm conditions result from a single short pulse from a sensor or switch. The impulse relay will react to this short pulse (as short as 0.1 seconds!) and can be used to operate a beacon or sounder until the relay is reset. Ideal for imforming operators or staff that action needs to be taken.

Interesting....

 

[333rocky333]

It was a Finder 20-22
Thanks TTC, it was linked to the shutter door to turn on the lights when they pressed the button to open it.
Then back off when the door shut the coil must get a voltage pulse from the shutter control box somehow.

 

[plugwash]

http://octopart.com/20.22.8.230.0000-finder-10546527#technical_specs[/QUOTE]
BTW if you follow the link to farnell on that page and then select your country they have a link to download the datasheet.