This device is installed on transformer…etc as a safety device which, in case of abnormal pressure rise is imposed by default or some serious accident inside the unit, will push up the cover of pressure relief device to discharge the internal pressure built up to outside, operating alarm or circuit breaker …etc by means of letting the contact make
When the internal pressure has come down, the device is so arranged thet the cover will be automatically returned to the original status so as for the air-proof to be maintained.
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