The difference between current relay and voltage relay

But from the relay design, the two are different. The current relay magnetic circuit system according to IW=C to consider, namely in the relay action in the process of action caused the armature coil inductance changes, it will not affect the current value.

The current relay is a relay that reflects the change of the current. It has a small number of turns and a rough wire diameter. The utility model can be connected in series with a load through a large current. The voltage relay reflect the voltage variation of the relay, it attracted many turns of fine wire coil. When in use, the power supply is connected in parallel.

The current is determined by the large impedance of other circuit elements in the circuit, and the influence of the current relay coil impedance on the whole circuit impedance is negligible. Therefore, the general current relay coil turns less, inductance and resistance are small, so the coil current is larger. Supply current relay coil is constant current value.

Voltage relay coil input signal is a relatively constant voltage value, usually the power supply voltage directly on the coil or assigned to the network through a constant voltage value. Therefore, the loop current depends mainly on the coil impedance, generally does not involve other loop components. In order to minimize its shunt effect on other branches, general fine wires, the number of turns, inductance and resistance are larger, the coil current is.

When selecting the current or voltage relay, there must be a relative circuit condition. Current relay requires constant current source circuit conditions, that is, the circuit has a series of large impedance, which has a small impact on the current impedance itself. Voltage relay requires constant voltage. As the voltage relay current relay, the coil resistance is small, easy to burn the coil, and even cause short circuit of power supply. Such as the voltage relay when the current relay coil used in series in the line, because of its large impedance will significantly change the original circuit parameters, the coil will not get enough current and the relay does not act. Relay manufacturers