Relay having a pressure relief valve assembly

A relay comprising:

• an insulation cover;
• a first yoke plate connected with the insulation cover and encloses a contact chamber with the insulation cover;
• the first yoke plate having a pressure relief hole;
• the pressure relief hole penetrating through two opposite side surfaces of the first yoke plate along a thickness direction and being communicated with the contact chamber;
• a contact assembly comprising a pair of stationary contact leading-out terminals, each of the pair of stationary contact leading-out terminals being arranged on the insulation cover and having an end protruding into an inside of the contact chamber, and a movable contact piece located in the contact chamber;
• a driving assembly connected with the movable contact piece and configured to drive movement of the movable contact piece such that two ends of the movable contact piece are respectively contacted with or separated from the pair of stationary contact leading-out terminals;
• and
• a pressure relief valve assembly arranged on the first yoke plate and configured to close the pressure relief hole when a gas pressure in the contact chamber is less than a threshold, and configured to be broken to open the pressure relief hole when the gas pressure in the contact chamber is greater than or equal to the threshold.