Release driving device and permanent magnet molded case circuit breaker

The present invention relates to a release driving device and a permanent magnet molded case circuit breaker. The release driving device is characterized in that an ejector rod is hinged to the end of a first rocker arm, a retainer is fixedly installed on the first rocker arm, and an elastic piece can drive the ejector rod to rotate clockwise, so that the ejector rod and the retainer are kept in limiting fit; during switching-on, the end of the ejector rod is located below a releasing top pressing surface and above a reset top pressing surface, and during switching-off, the end of the ejector rod is located below the reset top pressing surface. The advantages of the present invention are that a spring release is additionally arranged and is matched with a permanent magnetic mechanism through an operating mechanism, so that the releasing protection of small voltage during short circuit can be met; the spring release and the permanent magnetic mechanism can form complementation, so that a more reliable safety p