Push Button Latching Relay Circuit

Push Button Latching Relay Circuit. Web the circuit uses only one active component, a dual mosfet, which provides the latching logic and acts as a high side power switch/relay. In this case, the off switch needs to be normally closed and break the circuit once it is pushed.

Relay Latching Circuit using Push Button Instrumentation Tools
Relay Latching Circuit using Push Button Instrumentation Tools from instrumentationtools.com

The designing of this circuit can be done with a single push button switch, 12v battery, two relays like rl1 & rl2, 1n4007 diodes like d1 & d2, and load like the bulb. There is also a third common type of latching relay on the market, namely ‘impulse switching’ relays. The latching relay circuit diagram is shown below.

Web The Circuit Uses Only One Active Component, A Dual Mosfet, Which Provides The Latching Logic And Acts As A High Side Power Switch/Relay.


The 5v power supply is an old mobile phone charger. A momentary button press causes the circuit to latch on, supplying power to the load, and it is turned back off by a longer button hold. Components with adequate voltage / current ratings are to be selected.

Per Relay Datasheet, Observe Coil Polarity.


The relay only draws current when it is being switched. Switches are critical components in any circuit which requires user interaction or control. Such a circuit can be advanced to the level of a touch switch, which only requires touching a metal pad.

Once Press The Switch For 1 Second Then The Load Is Turned On, But Again Press The Same Pushbutton.


The shown circuit has the (possible) advantage it will not turn on if power is. They allow control over current flow in a circuit (without having to actually get in there and manually cut or splice the wires). So, for latching relay operation, the common point of the relay must connect with the source via push button,.

Web Relay Latching Circuit Using Push Button And Sensorin This Video You Will Learn How You Can Turn On And Off Any Relay By Using 3 Wire Sensor And A Push Butto.


It was originally intended to allow a single pushbutton switch on the dash of a vintage car to provide a latched function. This circuit is copyrighted and may be. In this circuit used 2 relays.

The Designing Of This Circuit Can Be Done With A Single Push Button Switch, 12V Battery, Two Relays Like Rl1 & Rl2, 1N4007 Diodes Like D1 & D2, And Load Like The Bulb.


If negative ground (rather than positive ground as shown), swap polarity. Web latching relay circuit diagram & working. Web well the ssr needs to be triggered with anything from 3 to 24v anyway.