Byamarenyo
Hi
I want to use a relay to occasionally interrupt the power from a generator that outputs 6-12 volts. I want to use an Arduino for this, but I only have a 250 volt relay with it. Can I use that, too, or would 12 volts be too low?
Unfortunately, ordering always takes a long time, which is why this would be easier.
Lg
(1 votes)
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That’s not a problem.
For the contact of the relay, the maximum information is given. As long as you don’t exceed it, the contact is not broken.
In some relays there are two data, one for direct current and one for alternating current. This has to do with clearing the demolition spark. Since pauses in the sinusoidal current course are in alternating current, a higher voltage can be used and the sparks are still erased in time. The spark lets flow further and heats the contacts. If it is not erased, the current and the contacts will still burn.
If there is only one indication on the relay, this is almost always the alternating current indication. In this case, one can only have almost half of the voltage at direct current. Since you’re only 12V, you’re far from it.
In the case of the coil voltage, this should fit exactly. If you take more, the coil becomes hot and the mechanism is loaded with too much force when switching, you take less, the relay switches slower and this can then lead to contract burning when switching on.
For example, if you have only a 6V relay, which has to be controlled with 5V, you can’t even turn on half the contact current without damaging the contact each time.
In your case, you only have to be careful that you do not exceed the maximum permissible current of the contact. At 230V relays, this is only a few amperes! If the power is not enough, you can switch a car relay to it. So 230V relay then switches 12V to the motor relay and this can then switch 20A or more depending on the design.
There are two circuits for relays
Conclusion:
The Control circuit (=control of the relay coil) COMMITTEE have the information of the relay. AC (AC) and DC (DC) must also fit.
The Working current (switching contacts) lower values the maximum voltage (in V) and maximum current (in A). There are also sometimes two data for AC (AC/current) and DC (equivalent voltage/current).
Good luck!
Thank you.
If the control circuit (coil) of the relay is to be built for 240V~, then the relay will be attracted with 12V NIEMALS.
Because the power of the coil (SOLL and IST) is calculated roughly:
P=U^2 / R
Psoll = 240V^2 / R = 75600/R
Pist = 12V^2 / R = 144/R
Ratio of the excitation power of the coil = 144/75600 = 0.0025 = 0.25%
These are only 0.25% of the nominal value, this is less than 1% (only 1/400), so totally too little!
Good luck!
It doesn’t work at 12v.
Then take a 5 V relay and connect it to the Arduino. A 250V relay wouldn’t even leak at 5V, which the Arduino transmits.