Supply of Shunting Mode Operation Switch Hsm Similar To Zcpa Program Switch As Per Clw Spec. No.: Clw/Es/S-1/Za, Model No.: 250-2Yw-005W Of M/S. Siemens Make. Note:- 1. Hsm Switch Program Should Be All Contact Closed At Zero Position & Open At 1 Position As Per Modification 0492 Circuit Diagram. 2. On Switch Plate Hsm Name & 0, 1 Marking Should Be Written. 3. Item Should Be Purchased From Clw Approved Source Or Their Authorized Dealer. 4. One Sample Should Be Got Approved Before The Bulk Supply..