Hi everyone, when i power up the circuits even i don't trigger the relays, they are overheating. When i try to trigger them sometimes they are not closing if they closed once i can't open them without power off the circuit. What can be the problem ?

 

What is the part number for the relay?

 

They are probably 3.3-Volt-Coil-Relays.
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Hi everyone, when i power up the circuits even i don't trigger the relays, they are overheating.

I think the relays are hot when the transistors are off.
So measure the voltage across the input of the relays. Is there voltage? What voltage?

 

What is the part number for the relay?

G3MB-202P 5V 2A Solid State relay

 

They are probably 3.3-Volt-Coil-Relays.
.
.
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They are G3MB-202P 5V 2A Solid State relay

 

I think the relays are hot when the transistors are off.
So measure the voltage across the input of the relays. Is there voltage? What voltage?

There are no voltage there (as it ought to be)

 

To make heat there must be voltage and current at the same time. If there is no voltage on the input, then there must be current in the output. Is there a load?
Does the relay say 5 VDC?

 

If there is no voltage on the input, then the output must be causing the problem. Do you have the power and load connected correctly. I suspect that you have the polarity reversed.

 

If there is no voltage on the input, then the output must be causing the problem. Do you have the power and load connected correctly. I suspect that you have the polarity reversed.

There is a contactor for the load but there is nothing on the contactor's output for a load.

 

To make heat there must be voltage and current at the same time. If there is no voltage on the input, then there must be current in the output. Is there a load?
Does the relay say 5 VDC?
View attachment 326040

it is not G3MB-202PL it is G3MB-202P (there is no 'L' at the end) let me check the power line again thanks for the answer.

 

Zero cross Triac out.
Are you switching both live and N of the same load, If so, Why??

 

Yes, switch only L and not N.
You do not need a diode across a SS relay.
If you use two relays, use only one transistor.

 

Zero cross Triac out.
Are you switching both live and N of the same load, If so, Why??

When i look for examples, i saw something like this so i used it.

 

Yes, switch only L and not N.
You do not need a diode across a SS relay.
If you use two relays, use only one transistor.
View attachment 326060

I see, thanks

 

We are shown a block with terminals and at that point no other information. So there is no reasonable way to expect a useful answer. then much later we are told a part number. and NEVER actually told the actual operating conditions.
and then, for the origin of the circuit " When i look for examples, i saw something like this so i used it. "
I suggest that it was not a reliable source at all.

Without adequate information the best one can hope for is random guesses!
For a "relay overheating" problem the voltage must be stated, as well as the current, both to operate the relay and to define the contact current.