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The LTC 4637 series rack units provide the option to rack-mount LTC 4600 series fiber optic modules in a standard EIA 48 cm (19-inch) rack. The unit incorporates an integral power supply that supplies power to all modules installed in the rack-mount unit. The supply also utilizes a standard IEC AC power connector for easy power cord replacement or exchange with various worldwide AC power plug configurations. Modules installed in the rack-mount unit can be hot- swapped, so it is not necessary to power down the rack when removing or replacing modules. The integral power supply incorporates an automatic electronic current limiting feature for each individual rack-mount slot. This design eliminates the possibility of a single-point failure causing a complete shutdown of the entire rack. The current limiting function is also self-resetting, should the fault or overload be of a temporary or intermittent nature.