I want to connect two 12v DC relays in series . can anyone tell me how to connect two relays in series .

 

hi md,
Is your supply voltage 24V DC.?
E
EDIT:
Like this image.

 

my input voltage is 12 v DC. i have relays as attached in the image .

 

hi md,
Is your supply voltage 24V DC.?
E
EDIT:
Like this image.

hi sir .Thanks for u r reply .
i want to know that if i connect the relays in series . if one relay is OFF will the other relay will be ON

 

hi,
If your voltage supply is only 12V you cannot connect two 12V relay coils in series,they will have to be connected in parallel.

 

sir ,
actually my need is that i have two 12 v DC relays . i want the relays to be connected such that when one relay is ON the other must be OFF.

 

You need to clarify your question. Do you mean connecting the coils in series or do you mean connecting contacts in series ? Explaining what you are trying to achive and why you want to do it in that particular way is more likely to get your problem resolved.

Les.

 

dear sir ,
actually i have an product (road blocker) . in that i have two terminals. when there is a contact between two terminals for more that 1.5 seconds , the blocker raises up in the emergency mode(blocker will raise up in 3 seconds ) . and if there is a pulse at the terminals it raises in the normal mode (blocker will raise up in 5 seconds ) . i have connected the two terminals to the relays with the help of push buttons . such that when the push button is pressed the terminals will get contact and the blocker raises up. But in this situation ,if i press and hold the push button , the relays will be ON until the push button is released ,so if i press the push button the blocker raises up in emergency mode .i dont want this situation. i want the relays to be connected to the push button in such way ,that when i press and hold the push button ,there must be a pulse at the terminals .it means even though i press and hold the push button, the relay must just give a pulse at these terminals and the relays must become inactive.

 

hi,
This circuit shows which ever PB is pushed first, it operates its relay and it locks out the other PB and relay.
Are you asking for a automatic/electronic delay of 1.5Secs ??
E

 

Is my understanding correct that you only ever want it to work in normal mode no matter how long the button is pressed ? Is there one or more buttons ?

Les.

 

yes. i want it to work in normal mode how long the push button is pressed. There are more than one push buttons .But if i get the concept of how to operate in normal mode how long the push button is pressed , i can apply the same thing for other push buttons

 

Looks like you guys are working on the same thing?
https://forum.allaboutcircuits.com/...ries-and-the-relay-contacts-in-series.139828/
Max.

 

I think you need an edge triggered monostable function. It MAY be possible to do this without any active electronic components. (It MAY also be possible to do this without any relays.)
Question 1 What is the minimum length of pulse required to trigger the device in normal mode ?

Question 2 What is the coil resistance of the relay ? (Or how much current does the coil take when fed with a 12 volt supply ?) (This is to estimate the required capacitance value connected in series with the coil to give the required pulse length.)

Question 3 What is the required voltage and current reqired and is it AC or DC to trigger the device ? (This is to see if it is practical to do what you want without a relay.)

Les.

 

hi,
This circuit shows which ever PB is pushed first, it operates its relay and it locks out the other PB and relay.
Are you asking for a automatic/electronic delay of 1.5Secs ??
E

dear sir ,
Thanks for u r reply .
i want to know that according to the diagram sent by you , will the relay be active until the PB is pressed . Because what i want is , how long the PB is pressed , it must work in normal mode .

 

Is my understanding correct that you only ever want it to work in normal mode no matter how long the button is pressed ? Is there one or more buttons ?

Les.

yes sir , could you please tell me how to connect

 

hi,
This circuit shows which ever PB is pushed first, it operates its relay and it locks out the other PB and relay.
Are you asking for a automatic/electronic delay of 1.5Secs ??
E

dear sir ,
as per your wiring ,will there be always continuity at the NO & COM terminals of relay OR will there will be only pulse at the NO & COM terminals of RELAY.
Because ,what i want is as long as the push button is pressed ,the relay NO & COM terminals must give only pulse .

 

hi
In order for the circuit to generate a relay pulse of 1.5secs a monostable action is required.
This could be achieved by using a 555 timer or a simple resistor/capacitor discharge timer.
You cannot get a 1.5sec delay by using two relays without additional circuitry.
E

 

I have a circuit I have used in the past that is a 2 relay flip-flop using one momentary P.B. the relays change state on each push of the button. If this will work for you.
Uses a couple of diodes and capacitor.
Max.

 

I have a circuit I have used in the past that is a 2 relay flip-flop using one momentary P.B. the relays change state on each push of the button. If this will work for you.
Uses a couple of diodes and capacitor.
Max.

send me the circuit . i will check it

 

This is the basis for it, I adapted it to run a bi=directional DC motor from the spare contacts on RLA.
12v relays may need a different value of the R and C.
Max.