Fresh from my parts bins, I present to you the majestic Mechanical Latching Relay! Enjoy!
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#relay #solenoid #teardown
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#relay #solenoid #teardown
- Music by Fran Blanche -
Frantone on Facebook - https://www.facebook.com/frantone/
Fran on Twitter - https://twitter.com/contourcorsets
Fran's Science Blog - http://www.frantone.com/designwritings/design_writings.html
FranArt Website - http://www.contourcorsets.com
Kinda cool (at least in certain use cases) that it just toggles per pulse, rather than needing two different control lines to latch and unlatch.
I am looking for a latching relay for my ancient garage door opener. 24 VAC coil and contacts that will run a 120V motor.
So it's equivalent to a frequency divider
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Thanks Fran! Great video!
First Mechanically Latching Relays I found was in the '70's, Volkswagen Headlight Relay. Pulling Signal Lever back momentarily put wire to ground, which would Switch SPDT Contacts. These were in ~2" metal cans. They have changed to the Cube design. Smaller, more compact. Great for Alarms Systems as it only draws power when switching. And if used on an Open loop Circuit. Battery would draw no Power til tripped. Only good if wires were not accessible and could notbe cut. Otherwise, close Circuit is Best, Supervised with a resistor is even Better.
I used one on a Catamaran for lighting. Just a simple pair of 2 Conductor wires to a Momentary pushbutton. Could switch lights from multiple Locations. That 24 Volt unit you show may work at 12 Volts.
Good thing about the VW Cube type is at 12 Volts, they can be used on Cars, Boats, anything. Using 12.
I know other Car Manufacturers use them. First I saw was '70's VWs.
With a metal chassis(Car), you can get away with running only 1 wire, other wire to chassis.
Good job showing operation.
Stratmando
that was interesting. who made it potter and brumfield? ? thanks!
Love your channel Fran.
good explanation Fran.
I really enjoyed your video, but have a question. It seems that when you used the wires to pulse the transformer it did move to one side and then come back, each time, as best I could tell. But if you only pulsed the transformer once, should not the transformer stay latched on the left side and not go back to the right side until you pulse it again? Also, how are you accounting for mechanical bounce, which causes many millisecond pulses (and is there a minimum pulse width to operate)?. Thanks, Shayle
Good video to understand bistable impulse relay
. Very well explained. Thank you . I have a linen ironer of WESCO MODEL NO BM 10025. It has Finder SPDT DIN Rail Latching Relay – 16 A, 24V ac.mi would appreciate if you tell me how to check if it is working as required. Pls do reply thank you from Antonio Goa the state of India. Thank you in advance
Reminds me of my pinball machine
This is exactly the explanation I was looking for. Subscribed. 🙂
Was also used in AC (3 rails / with middle rail) model railroad engines for reversing direction on over voltage. TL;DR: The latching relay switches the feed of the current from one side to the other of the center-tapped stator coil and that changes the direction of the magnetic field in the stator relative to the magnetic fields in the rotor. In order that the over voltage pulse does not make the engine jump, the relay has either an additional contact or mechanical arrangement of the normal-open/close contacts that breaks the circuit as soon as the plunger / lever moves. Voltage for running the AC motor is 6..17V AC, the over voltage pulse is about 20V. The tension of the spring holding the plunger or lever of the relay is tuned to be overcome only by the over voltage impulse (Lionel, Märklin, etc.)
So it works on the same mechanical principle as a retractable ball point pen. Thanks for showing us that