| 摘要 |
An expandable housing for plug-in protectors for accommodating printed wiring board of varying length. The improved housing comprises a shell unit and a base unit. Both the shell and base units have a hollow longitudinally extending body with an opening at the front and rear portions, respectively. On at least one of the inner sidewalls in the cavity of the body of the shell unit is a first set of teeth running horizontally to the longitudinal axis of the body. On at least one of the outer sidewalls on the body of the base unit is a corresponding second set of teeth running horizontally to the longitudinal axis of the body. The cavity of the base unit supports and receives a portion of a printed wiring board containing surge protective devices, which is connected to pins extending from the front portion of the body of the base unit. The body of the base unit, with the printed wiring board extending from the rear portion, advantageously fit within the cavity of the shell unit with the first set of teeth engaging and interlocking the second set of teeth to form the expandable housing unit. The overall length of the housing is variable depending on the extent base unit with the printed wiring board extending therefrom fits within the cavity of the shell unit.
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