KYN28A-12 (Z) Armored removable AC metal enclosed switchgear (also known as GZS1 switchgear) is an advanced medium voltage switchgear developed and provided by Xi’an Senyuan Company for technology transfer. It is suitable for three-phase AC 50Hz power system, used to receive and distribute electrical energy and control, protect and monitor the circuit. Conforms to standard GB3906-91 “3~ 35kV AC metal enclosed switchgear” GB11022-89 “General technical conditions for high voltage switchgear” IEC298 (1990) “AC metal enclosed switchgear and control equipment above 1kV and below rated voltage” DL404-91 “Indoor AC high voltage switchgear ordering technical conditions”