What is coil voltage of a relay?
The coil of a relay passes a relatively large current, typically 30mA for a 12V relay, but it can be as much as 100mA for relays designed to operate from lower voltages….Coil resistance.
| Relay coil current = | supply voltage |
|---|---|
| coil resistance |
Is a relay the same as a coil?
Relays involve two circuits: the energizing circuit and the contact circuit. The coil is on the energizing side; and the relays contacts are on the contact side. When a relays coil is energized, current flow through the coil creates a magnetic field.
Why is the coil rating different for relays?
I have seen many relays with same current and voltage rating (like 10A 230VAC or 5A 30V ) but the coil rating (I am not sure, I am using the right word) are different. Some are 5V some are 12V and so on.. . What I want to know is, why there’s difference is in this value?
Can a relay be operated from a 5V power source?
If you want to make a relay to be operated from a 5V power source, you will use fewer turns of thicker wire than if it is to operate from 12V or 24V, all other things being equal. For the relay to work mechanically, the ampere-turns of the different coils has to be about the same for different rated coil voltages.
Which is less a 5V coil or a 12V coil?
So the DC resistance of a 5V coil will be less than for a 12V coils. Relays are basically current-operated devices that are specified in terms of voltage. The distinction becomes important if the relay coil gets very hot, which results in less current and the relay may then fail to pull in, even with the (nominal) rated voltage applied.
What is the nominal voltage of a relay?
The relays are designed and manufactured to be operated with the stated nominal voltage across the coil when energized. If you want to make a relay to be operated from a 5V power source, you will use fewer turns of thicker wire than if it is to operate from 12V or 24V, all other things being equal.