The utility model provides a structure that anchor clamps are overhauld to GW4, general contact of GW16 type isolator location, a set of contact positioning card block including the base and on being fixed in the base should organize and form the location bayonet socket that can coordinate the solid GW16 type isolating switch contact protection casing of card between the contact positioning card block, and had at least a contact positioning card block to form can to coordinate the solid GW4 type isolating switch contact of card and can block admittedly in GW16 type isolator two and touch between the finger mount pad. The utility model discloses can overhauing general location in GW4 type and GW16 type isolating switch contact, adopting the fixed position of card, easy dismounting can improve work efficiency greatly, reduces intensity of labour, reduces repair time, and adopt polyoxymethylene resin material producing, light in weight conveniently carries, simultaneously, has seted up the via hole on the base, the dismouting and the maintenance of the part of being more convenient for.