An exhausted or tripped surge protection device has used up its protection, usually after a significant surge event, and no longer protects the inverter. The inverter raises an SPD warning, for example Warn0040 for the DC SPD or Warn0100 for the AC SPD on CPS inverters. SMA inverters show a fault overvoltage protector message. Check the SPD module by eye. A red indicator, sometimes with an audible alarm, means the SPD has been used up. The same warning can appear if the arrester is just not seated properly. A green indicator points to this. Replace any SPD module that shows red or has tripped. If the indicator is green, remove the module and seat it again in its socket. If the warning still does not clear, contact the manufacturer's service team. Some SPDs have dry alarm contacts that can report a failed unit remotely to a monitoring system.
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affectsc1 drafted · lead Surge protection device
sec=h281 h=3b4b16a8ddf5tbl=3.r2 h=176220009679tbl=31.r4 h=f5dbb90220adsec=h198 h=3b4b16a8ddf5tbl=7.r6 h=4f67694d74a3tbl=7.r8 h=e5d6e169f09atbl=7.r4 h=0296e9cdc4ccThe inverter's built-in surge protection modules are replaced when needed. The CPS inverter raises warnings Warn0040 (DC SPD) and Warn0100 (AC SPD).
sec=h29 h=ecaae89914detbl=3.r2 h=176220009679tbl=31.r4 h=f5dbb90220adverified by: review-workflowverified on: 2026-10-20
caused_byc3 verified · fact Voltage surge event
Eaton gives a significant surge event as the probable cause when the SPD shows its red indicator.
tbl=7.r6 h=4f67694d74a3tbl=7.r8 h=e5d6e169f09atbl=7.r4 h=0296e9cdc4ccverified by: review-workflowverified on: 2026-10-20
presents_asc5 verified · fact SPD status indicator red
On CPS inverters a red indicator means the SPD module must be replaced. A green indicator points to a seating problem.
tbl=3.r2 h=176220009679tbl=31.r4 h=f5dbb90220adtbl=7.r6 h=4f67694d74a3tbl=7.r8 h=e5d6e169f09atbl=7.r4 h=0296e9cdc4ccverified by: review-workflowverified on: 2026-10-20
c6 verified · fact SPD audible alarm
tbl=7.r6 h=4f67694d74a3tbl=7.r8 h=e5d6e169f09atbl=7.r4 h=0296e9cdc4ccverified by: review-workflowverified on: 2026-10-20
detected_byc7 verified · fact Visual inspection
Look at the SPD status indicator.
tbl=3.r2 h=176220009679tbl=31.r4 h=f5dbb90220adtbl=2.r4 h=f5dbb90220adtbl=55.r4 h=f5dbb90220adverified by: review-workflowverified on: 2026-10-20
c8 verified · fact SPD alarm contact monitoring
Dry contacts switch to alarm if a thermal protector or fuse inside the SPD opens or a phase loses power. Normally-closed wiring is recommended because it also detects a cut wire.
sec=h52 h=9fa81ff271b9verified by: review-workflowverified on: 2026-10-20
mitigated_byc9 drafted · lead SPD replacement
tbl=3.r2 h=176220009679tbl=31.r4 h=f5dbb90220adsec=h282 h=99a29cc4279esec=h199 h=99a29cc4279etbl=7.r6 h=4f67694d74a3tbl=7.r8 h=e5d6e169f09atbl=7.r4 h=0296e9cdc4ccsec=h29 h=ecaae89914dec10 drafted · lead SPD module reseating
Applies when the indicator is green or the arrester may not be inserted correctly.
tbl=3.r2 h=176220009679tbl=31.r4 h=f5dbb90220adsec=h282 h=99a29cc4279esec=h199 h=99a29cc4279ec11 verified · fact Contact manufacturer service
Use this if replacing or reseating the module does not clear the warning.
tbl=3.r2 h=176220009679tbl=31.r4 h=f5dbb90220adverified by: review-workflowverified on: 2026-10-20
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