Havells India Ltd. Offers Double Pole Changeover Switch. Havells India Ltd. Is ISO 9001 certified. The Double Pole Changeover Switch is used in residential places. This switch is designed for use in low voltage distribution circuits, wherever continuity of supply is necessary and for switching to an alternate source of supply from main supply and vise-versa. The Double Pole Changeover Switch comes in two ranges: 25A or 40A. These switches are approved by international quality bodies such as KEMA, UL, CE, CSA and VDE and are as per IEC standards.