SMA 600-US - Manual (Page 45)

SMA America, LLC 9 Troubleshooting
Installation Manual CU600-1000US-IA-en-10 45
9.2 Replacing the String Fuses
Each string fuse is assigned to one string. If one or several string fuses are blown or defective, you
have to replace the respective string fuses.
Requirements:
☐ Only UL-listed string fuses according to UL 2579 are permitted.
☐ 600 V string fuses must be inserted for the Connection Unit 600-US.
☐ 1,000 V string fuses must be inserted for the Connection Unit 1000-US.
☐ The fuse size must be 10 mm x 38 mm (midget format).
☐ Only maximum 20 A string fuses are permitted.
Procedure:
2. Turn the DC switch-disconnector OFF. Turn the DC
switch-disconnector counterclockwise by 90°.
3. Remove the lid of the Connection Unit. Loosen all
captive screws with an Allen key (AF 4) and
remove the lid by lifting it from below.
4. Open all safety levers needed all the way.
1.
Danger to life due to electric shock
• Make sure that all devices (e.g. inverter) connected to the Connection Unit are switched
off and protected against reconnection (see manual of the respective device).
• Ensure that no DC voltage is present.