THORLABS S4FC Series, User Manual

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S4FC Series Fiber Coupled Laser Source Chapter 7: General Maintenance
October 24, 2017, Rev R Page 17
7.3. Fuse Replacement
It may be necessary to replace an open fuse. To do this you must perform the following procedure.

Remove the AC power cord if it is connected to the unit.

Locate the fuse tray directly below the AC power cord connection on the rear panel of the unit.

Carefully use a flat blade screwdriver to open the fuse tray.

Remove the existing fuse and install the appropriate fuse.
Specification Value
Manufacturer Littlefuse
Manufacturer part number 218.500 HXP
Thorlabs item number 4300-GMC-250-500MA
Description 500 mA, 5X20mm, Time-Lag, 218 Series

Push the fuse tray back into place making sure that it snaps and seats correctly.
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Connect the appropriate power cord into the AC receptacle and plug the unit in.