Latching Relay Circuit

This is normal behaviour until now but what makes it a latch circuit.

Latching relay circuit. Resistor r2 and r3 prevents the short circuit in this condition. When we press push button supply goes to relay a1 point and relay gets on and its contact changes but when we release push button supply cutoffs and relay gets off. This is achieved when an electromagnetic current generated by the electrical input from the first device attached to the relay causes the contacts in the switch to open or close. What is a latching relay.

These are very useful in situations where energy efficiency is important but also in situations where you need the relay to remember its state typically so that the user can press a button to close the relay and press a second button to open the relay again. These are very useful in situations where energy efficiency is important but also in sitations where you need the relay to remember its state typically so that the user can press a button to close the. Here i demonstrate a circuit which is a simple asynchronous sr latch using a relay. An electrically latched relay is a standard relay with one of its own contacts wired into its coil circuit.

There are two kinds of latching relays. It is a relay that is set on orreset off by the input of a pulse voltage. Now when base of transistor bc557 gets grounded it starts conducting and energises the coil of relay which activates the relay and turns on the device connected to relay. An earth leakage circuit breaker includes a specialized latching relay.

A stepping relay is a specialized kind of multi way latching relay designed for early automatic telephone exchanges. A general purpose relay switch is designed to function as a bridge on one or more connected devices or circuits receiving an input signal from one source and transmitting an on off set reset output to another. It is also called a keep relay. Relay latching circuit using push button we connect relay and push button as per figure.

Latching relay circuit a latching relay is a relay which only draws power during the brief voltage pulse required to make it change state. A latching relay is electrically set to one position and it remains latched in that position until it is electrically reset to the opposite position. In our case led will glow.