General Details

Smart String Box – Active

The IDS String boxes are high quality products used to merge the electrical energy of single PV module strings and also used to disconnect the DC lines from the inverter. SOLO String Boxes can be connected in parallel to feed one tracker input of any inverter

  • Up to 25 Strings
  • Up to 250A
  • Remote switchable
  • Up to 1200V operating voltage
  • Integrated overvoltage protection
  • Status feedback
  • Temperature Range: -20°C to +60°C
  • With or without string current monitoring
Techical Info
Type SSB-A-14-140SSB-A-25-250
Electrical Data
Maximum operating voltageU DC
1000 V DC or 1200 V DC
Maximum output current DCI DCmax
140 A
250 A
Maximum number PV inputs (strings)
Maximal input current DC per stringI STRmax
10 A
String current measurement rangeI STR
0.5 – 15 A
Reverse string current measuringI STR rev
Surge arrester
Type II
State indication lamp on the door
Test voltage
2.5 kV, 50 Hz, 1 min
Surge arrester fault indication
Yes (auxiliary dry contacts)
Mechanical Data
Dimensions in mmWxDxH
735 x 270 x 535
26 kg
29 kg
RAL 7035 (light grey)
Enclosure material
Glass-fibre-reinforced and halogen-free polyester
Protection class according to EN 60529
IP55 (outdoor)
Impact strength according to EN 50102
Max air humidity
Ambient temperature rangeT amb
-20 °C ... +60 >°C
UV proof
String Box Interface
DC contactor control input
230 V AC +10%/-15%, 50 Hz ± 10 %, P max = 40W
String Box Monitor Interface
Ready feedback
Separate feedback for each Smart String Box; Closed dry contact when ready
Ready feedback output
24 V AC/DC (18 – 36 V), 2 A at 30 V DC
Fibre optical interface (standard)
Ring type serial interface connection
RS 485 serial interface (optional)
Separable screw terminal with. 6 pins for easy bus wiring. Galvanically isolated from monitoring electronic.
Stainless steel enclosure
Fuses with visual indication when tripped
PV(–) disconnect type terminals
CE conformity / EMC
Yes / EN 61000-6-2, EN 61000-6-4 / EN 50178
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