Fronius DC- Busbar Connects Your External String Combiner
The Fronius DC- Busbar (42,0201,4480) is the negative half of the Fronius DC connector kit 25. Fronius states that when a Symo or Symo Advanced inverter is operated with an external string collection box, this kit must be used.
In that setup the modules are protected in the external combiner, and the busbar gives the combined DC return a proper landing point inside the inverter.
Why You'll Love The Fronius DC- Busbar
The part Fronius specifies. The Symo Advanced installation instructions name 42,0201,4480 for DC- when an external string collection box is used.
Clean combiner installs. Land the combined negative conductor on one busbar instead of individual string inputs.
Al or Cu conductors. Accepts 10 to 4 AWG (6 to 21 mm²) aluminum or copper wire.
Pairs with the DC+ busbar. Use it with the Fronius DC+ Busbar (42,0201,4479) to complete the kit.
Your life, with the Fronius DC- Busbar
Your installer finishes the combiner run without improvising a connection. The wiring compartment looks the way Fronius drew it, the inspection goes smoothly and your system starts producing on schedule.
The Fronius DC- Busbar in a nutshell
DC connector kit 25
Negative busbar, Fronius item number 42,0201,4480.
For external combiners
Required by Fronius when the inverter runs with an external string collection box.
Wide conductor range
Terminal for 10 to 4 AWG Al/Cu, torque 5.5 Nm (48.6 lbf.in).
Symo family fit
Shown in the Fronius Symo and Symo Advanced installation instructions.
Fronius DC- Busbar specifications
General
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Part number: 42,0201,4480 (DC-)
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Kit: Fronius DC connector kit 25 (DC+ part 42,0201,4479 sold separately)
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Conductor size: 6 to 21 mm² / 10 to 4 AWG, Al or Cu
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Tightening torque: 5.5 Nm / 48.6 lbf.in
Max current shown in the Fronius diagram
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Symo Advanced 10.0-3 and 12.0-3 208-240: 41.5A
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Symo Advanced 15.0-3, 20.0-3, 22.7-3 and 24.0-3 480: 51A
Use
- Fronius Symo and Symo Advanced inverters operated with an external string collection box
- Modules protected in the external box, with metal bolts used in the inverter in place of string fuses
Let the experts help you find your perfect Fronius DC- Busbar setup
Planning a combiner layout for a Symo? Send us your string plan and inverter model and we will confirm you need the DC connector kit and both busbars.
Email support@kratopower.com or call +1 888-855-7286.
Fronius DC- Busbar documents and materials
Safety disclaimer: Inverter DC wiring carries lethal voltage whenever the array is in light. Installation should be carried out by a licensed electrician in line with the NEC, local codes and the manufacturer's instructions. You use this product at your own risk. The content on this page is general product information, not professional or medical advice. If you have any doubt, consult a qualified professional.
