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HAPL-310N and HAPL-410N-type limit switch box is sent trip actuator and valve position signal to the site and remote operator station. It can direct the actuator installed on the upper part of the standard VDI / VDE 3845. Characteristics of visual field position indicator, quick adjustment of the location of the cam; adjustable cam spline and spring through the installation, as long as the switch from the spline cam can rotate the location of the required adjustment, anti-out shell imported screws and two cable G1 / 2 "pipe interface. internal trip switch pre-connect wiring terminals, eight terminals and can be used to connect the solenoid valve.