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Siemens SPD device provides surge protection for the whole house. This unit takes up the space of two standard single-pole breakers, but also includes two single-pole breakers so you dont lose space in your load center. Once connected in the panel, the SPD device protects the entire panel and all branch circuits from surges, not just the two circuits connected to the SPD. The initial clamping stage is 240 volts. LEDs provide protection status notification. Siemens strongly recommends the use of "used" crushers. By installing used breakers in a Siemens panel, the **on the panel will be void Siemens does not sell used breakers and has not approved any third party sellers.