A switchgear assembly/panel board equipment as an insulated rigid assembly for the purpose of separating compartments, holding busbars and receiving plugs extended out from withdrawable/removable units, the insulated rigid assembly, comprising: a. a main embodiment which is a rigid insulated rectangular plate of a substantial thickness having a rib structure (11, 31), of which a front surface comprising: i. an array of internally angled plug-holes to allow plugs extended out from withdrawable/removable units to plug-in to busbars mounted in the rear surface of the main embodiment; ii. an array of self-taping screw holes to fix objects such as plug bases or shutter plates; iii. a series of rectangular blind slots and iv. mounting screw holes on two vertical mounting edges to mount the main embodiment to a frame structure of the switchgear assembly/panel board, the rear surface comprising: v. a series of parallel recessed vertical channels to accommodate busbars; vi. an array of self-tapping screw receiving holes to fix an auxiliary embodiment and vii. two tapered mounting edges on its left and right vertical ends, and two horizontal edges, the top horizontal edge having a series of projected male clips and the bottom horizontal edge having a series of receptacle female clips to extend the main embodiment to any height of the switchgear assembly/panel board; b. an auxiliary embodiment which is a rigid insulated holder having a longitudinal profile with a rib structure, of which one narrow side surface comprising rectangular dips in regular intervals and the opposing side comprising screw holes for self-tapping screws collectively meant for fastening busbars to the main embodiment; c. an assembly of shutter plates of which the upper shutter plate comprising: trapezoidal projections; rectangular cut-outs and vertical sliding slots and the lower shutter plate comprising: trapezoidal dips; a triggering-cut and horizontal sliding slots to control access to busbars mounted in the rear surface of the main embodiment and d. pair of 'L' shaped mounting rails comprising tapped through holes one surface and free holes on the other surface to fix the main embodiment to the frame structure of the switchgear assembly/panel board. a. a main embodiment which is a rigid insulated rectangular plate of a substantial thickness having a rib structure (11, 31), of which a front surface comprising: i. an array of internally angled plug-holes to allow plugs extended out from withdrawable/removable units to plug-in to busbars mounted in the rear surface of the main embodiment; ii. an array of self-taping screw holes to fix objects such as plug bases or shutter plates; iii. a series of rectangular blind slots and iv. mounting screw holes on two vertical mounting edges to mount the main embodiment to a frame structure of the switchgear assembly/panel board, the rear surface comprising: v. a series of parallel recessed vertical channels to accommodate busbars; vi. an array of self-tapping screw receiving holes to fix an auxiliary embodiment and vii. two tapered mounting edges on its left and right vertical ends, and two horizontal edges, the top horizontal edge having a series of projected male clips and the bottom horizontal edge having a series of receptacle female clips to extend the main embodiment to any height of the switchgear assembly/panel board; i. an array of internally angled plug-holes to allow plugs extended out from withdrawable/removable units to plug-in to busbars mounted in the rear surface of the main embodiment; ii. an array of self-taping screw holes to fix objects such as plug bases or shutter plates; iii. a series of rectangular blind slots and iv. mounting screw holes on two vertical mounting edges to mount the main embodiment to a frame structure of the switchgear assembly/panel board, v. a series of parallel recessed vertical channels to accommodate busbars; vi. an array of self-tapping screw receiving holes to fix an auxiliary embodiment and vii. two tapered mounting edges on its left and right vertical ends, and two horizontal edges, the top horizontal edge having a series of projected male clips and the bottom horizontal edge having a series of receptacle female clips to extend the main embodiment to any height of the switchgear assembly/panel board; b. an auxiliary embodiment which is a rigid insulated holder having a longitudinal profile with a rib structure, of which one narrow side surface comprising rectangular dips in regular intervals and the opposing side comprising screw holes for self-tapping screws collectively meant for fastening busbars to the main embodiment; c. an assembly of shutter plates of which the upper shutter plate comprising: trapezoidal projections; rectangular cut-outs and vertical sliding slots and the lower shutter plate comprising: trapezoidal dips; a triggering-cut and horizontal sliding slots to control access to busbars mounted in the rear surface of the main embodiment and d. pair of 'L' shaped mounting rails comprising tapped through holes one surface and free holes on the other surface to fix the main embodiment to the frame structure of the switchgear assembly/panel board.