Combination DC disconnect and PV array combiner box

SMA Combi-Switch is ETL Listed to UL 1741 for countries requiring certification. It conveniently combines a DC disconnect with PV string fusing in a compact, rugged NEMA 3R enclosure. These switches are ideal for applications where a remote DC disconnect is desired. The lockable, visible blade design provides clear switch status for increased safety. Each switch is equipped with four Touch Safe™ fuse holders that provide connections for up to four strings of PV modules. Field-proven and UL-recognized components help assure a safe, code-compliant and reliable installation.


  • ELT Listed to UL 1741 for countries that require certification


  • Greatly simplifies PV input wiring


  • Compact, rugged NEMA 3R/4 wall mount steel enclosure
  • Heavy-duty, lockable, visible blade disconnect switch


  • PV positive wires all land directly on Touch Safe™ fuse holders
  • 4-Circuit, fused input protection
Technical Data
Number of Inputs 4
Wiring Configuration Positive or Negative Ground
Positive Input Wire Size 14 to 8 AWG
Positive Input Terminal Torque 14 in-lb.
Negative Input Wire Size 14 to 8 AWG
Negative Input Terminal Torque 35 in-lb.
Output Wire Size 6 to 2 AWG
Output Terminal Torque 40 in-lb.
Maximum Input Fuse Rating 10 A, 600 VDC, Midget
Maximum Output Current 40 ADC
Maximum Voltage 600 VDC
Maximum Continuous Output Current 32 ADC
Maximum Number of Outputs 1 Positive, 1 Negative
Enclosure Type NEMA 3R, Steel
Weight 10 lbs. (approx.)
Dimensions (with handle) W x H x D in inches 7.75 x 15.0 x 5.75

Technical Manual

TECHNICAL NOTE - Combi-Switch listing information TECHCOMSWITCH-HUS100611.pdf
  • Type: Technical Manual
  • Language: English (US)
  • Number: TECHCOMSWITCH-HUS100611
  • Version: 1.1

User Manual

COMBI-SWITCH - DC Disconnect and Combiner 'Switches - Installation and Wiring Instructions COMSWITCH-BUS092914.pdf
  • Type: User Manual
  • Language: English (US)
  • Number: COMSWITCH-BUS092914
  • Version: 1.4

Data sheet

COMBI-SWITCH - Combination DC disconnect and PV array combiner box COMBI-SWITCH-DUS134617W.pdf
  • Type: Data sheet
  • Language: English (US)
  • Number: COMBI-SWITCH-DUS134617
  • Version: 1.7