Relay

Embodiments of the utility model disclose a relay which can realize zero switching, thereby solving the problem that traditional relays have no zero-switching functions. The relay comprises a machinery switch, a switching/cut-off signal detector, and a zero-switching controller connected with each unit respectively. When the switching/cut-off signal detector detects a switching signal, the zero-switching controller is notified, so that the zero-switching controller detects the power supply voltage of each phase, and calculates motion time of a switching switch, thereby controlling the switching switch to be switched on the moment that the voltage passes zero; similarly, when the switching/cut-off signal detector detects a cut-off signal, the zero-switching controller is also notified so that the zero-switching controller detects the current of each phase, and calculates motion time of the switching switch, thereby controlling the switching switch to be switched off the moment that the current passes zero; thu