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Disconnect Switch Option

All APC modular series SPDs can be equipped with an optional internal disconnect switch (Figure 3). The disconnect switch provides a means to de-energize the entire suppressor, to facilitate servicing of unit’s components. (See Warn- ing regarding the Neutral when testing the distribution system).

NOTE: A disconnect switch will add length, which increases the response time and the clamp voltage. To minimize the additional lead length and optimize performance, units are available with an optional internal disconnect switch. The disconnect switch is not a device that can be added to the unit after purchase. It must be ordered with the unit as the mounting cabinet is larger for units having the option.

If an internal disconnect switch is to be used, the location of the SPD and the disconnect switch should be planned out carefully to avoid excessive lead length when wiring the devices.

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