To provide a leakage relay technology capable of selecting a manual reset or an automatic reset.

This leakage relay is provided with a first control system for forming a first control signal to reset at least an alarm contact based on the manual operation of a reset button or the like, a second control system for outputting a second control signal to reset the alarm contact by automatically forming it by an electronic circuit, and a selecting means to select either one on the first and second control systems, or either one of the first and second control signals, and as to at least the resetting operation of the alarm contact, the resetting operation by a manual operation or the resetting operation by an automatic operation can be selected.