CT□ spring operation mechanism is used to be the corollary equipment of PLRN36-12D/T100-31.5 and FLN36-12D/630-20 indoor high voltage SF6 load switch, with rated voltage of 12kv.The version is according to the principle of the spring released during passing half. There are three stations of closing, tripping and grounding. It is characterized for its medium volume, convenient equipment appliance and strong adaptability.