Latching Relay Circuit

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.

Latching relay circuit.

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. Relay latching circuit using push button we connect relay and push button as per figure. Here i demonstrate a circuit which is a simple asynchronous sr latch using a relay. This is normal behaviour until now but what makes it a latch circuit.

In our case led will glow. It is a relay that is set on orreset off by the input of a pulse voltage. 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. An earth leakage circuit breaker includes a specialized latching relay.

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. 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. 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. 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.

An electrically latched relay is a standard relay with one of its own contacts wired into its coil circuit. Latching relay circuit a latching relay is a relay which only draws power during the brief voltage pulse required to make it change state. It is also called a keep relay. A stepping relay is a specialized kind of multi way latching relay designed for early automatic telephone exchanges.

Even after the input voltage is interrupted this relay maintains its set or reset condition until it receives the next inverting input. What is a latching relay. There are two kinds of latching relays.