Power relay

Power relay

— protective devices that automatically turn off the protected section of the circuit when the power consumption is exceeded. Such a device monitors both the current strength and the voltage at the same time — we recall that the power is calculated by the formula "current strength multiplied by voltage." The need for a power relay is due to the fact that in some situations it is not an excess of current or voltage that gives an overload, but a combination of them — moreover, both volts and amperes can remain within acceptable values.