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Solar Disconnects & Transfer Switches

The balance of system is where solar installations pass or fail inspection. Transfer switches, disconnects, breakers and busbars are what let an inspector see a safe, code-compliant path from array to panel, and they are the parts most DIY builds under-specify.

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Tigo 200A MCB Auto Transfer Switch (ATS) - Backup/Grid - Tigo 200A MCB Auto Transfer Switch facing forward
$2,067.00 - $2,067.00
$2,067.00
$2,067.00 - $2,067.00
$2,067.00

Tigo 200A MCB Auto Transfer Switch (ATS) - Backup/Grid

Tigo Energy

The Tigo 200A MCB Automatic Transfer Switch is a required component of a Tigo EI residential system — the device that islands the home from the gri...

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$2,067.00 - $2,067.00
$2,067.00
$2,067.00 - $2,067.00
$2,067.00
Tigo 50A MLO Auto Transfer Switch (ATS) - Backup/Grid - Left tilt view of Tigo 50A ATS Sold out
$440.00 - $440.00
$440.00
$440.00 - $440.00
$440.00

Tigo 50A MLO Auto Transfer Switch (ATS) - Backup/Grid

Tigo Energy
Out of stock

The Tigo 50A MLO Auto Transfer Switch (ATS) - Backup/Grid is an electrical component from Tigo Energy — Compatibility Tigo; EI Residential Solar So...

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$440.00 - $440.00
$440.00
$440.00 - $440.00
$440.00
Sold out
SoftStartUSA - SoftStartHome 3 - Soft Start Home 3 Right Side
SoftStartUSA - SoftStartHome 3 - Soft Start Home 3 Front facing
$349.00 - $349.00
$349.00
$349.00 - $349.00
$349.00

SoftStartUSA - SoftStartHome 3

SoftStartUSA

The SoftStartUSA - SoftStartHome 3 is an electrical component from SoftStartUSA — Easy DIY Installation Installs in under 15 minutes with no specia...

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$349.00 - $349.00
$349.00
$349.00 - $349.00
$349.00
SoftStartUSA - SoftStartUP w 30A Power Adapter - Left tilt wide shot view of SoftStartUP on left hand of screen. Front View of SoftStartUp on right hand of screen
SoftStartUSA - SoftStartUP w 30A Power Adapter - Front View of SoftStartUp
$595.00 - $595.00
$595.00
$595.00 - $595.00
$595.00

SoftStartUSA - SoftStartUP w 30A Power Adapter

SoftStartUSA

The SoftStartUSA - SoftStartUP w 30A Power Adapter is an electrical component from SoftStartUSA — Simple Plug-and-Play Design No installation or wi...

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$595.00 - $595.00
$595.00
$595.00 - $595.00
$595.00
SoftStartUSA - SoftStartRV - right tilt view of SoftStartRV
SoftStartUSA - SoftStartRV - Left tilt bottom view of SoftStartRV
$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00

SoftStartUSA - SoftStartRV

SoftStartUSA

The SoftStartUSA - SoftStartRV is an electrical component from SoftStartUSA, stocked by Urban Supply for solar and storage builds.Why It MattersBre...

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$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00
SoftStartUSA - SoftStartHome 6 - Soft Start Home installation kit
SoftStartUSA - SoftStartHome 6 - Front View of Soft Start Home
$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00

SoftStartUSA - SoftStartHome 6

SoftStartUSA

The SoftStartUSA - SoftStartHome 6 is an electrical component from SoftStartUSA — Easy DIY Installation Installs in under 15 minutes with no specia...

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$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00
Nader DC Circuit Breaker - 240V 100A - Nader DC Circuit Breaker 240V 100A angled right
$65.00
$65.00 - $65.00
$65.00
$52.00
$52.00 - $52.00
$52.00

Nader DC Circuit Breaker - 240V 100A

Nader

The Nader DC Circuit Breaker - 240V 100A is an electrical component from Nader — 240V; 100A.Why It MattersThe components between the array and the ...

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$65.00
$65.00 - $65.00
$65.00
$52.00
$52.00 - $52.00
$52.00
SmoothStarter Single-Phase Soft Starter 16A-32A - SS230V1P16-32 - SmoothStarter AC Compressor Soft Starter front view slightly angled left
$285.00 - $285.00
$285.00
$285.00 - $285.00
$285.00

SmoothStarter Single-Phase Soft Starter 16A-32A - SS230V1P16-32

SmoothStarter
In stock

The SmoothStarter Single-Phase Soft Starter 16A-32A - SS230V1P16-32 is an electrical component from SmoothStarter — 16A; 32A.Why It MattersA compre...

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$285.00 - $285.00
$285.00
$285.00 - $285.00
$285.00
OutBack Power - Radian Load Center - Closed Metal electrical load center panel with breakers and interior wiring space
OutBack Power - Radian Load Center - Open metal electrical load center panel with breakers and interior wiring space
$1,987.00 - $1,987.00
$1,987.00
$1,987.00 - $1,987.00
$1,987.00

OutBack Power - Radian Load Center

OutBack

The OutBack Radian GS Load Center consolidates the AC and DC connections for a Radian Series inverter/charger installation into a single enclosure ...

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$1,987.00 - $1,987.00
$1,987.00
$1,987.00 - $1,987.00
$1,987.00
Nader DC Circuit Breaker - 60V 200Amp with Enclosure - Nader DC Circuit Breaker | 60V 200Amp with Enclosure open forward facing
Nader DC Circuit Breaker - 60V 200Amp with Enclosure - Nader DC Circuit Breaker | 60V 200Amp with Enclosure open angled left
$64.99 - $64.99
$64.99
$64.99 - $64.99
$64.99

Nader DC Circuit Breaker - 60V 200Amp with Enclosure

Nader

The Nader DC Circuit Breaker - 60V 200Amp with Enclosure is an electrical component from Nader — 60V; 240 Vac.Why It MattersOvercurrent protection ...

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$64.99 - $64.99
$64.99
$64.99 - $64.99
$64.99
Nader DC Circuit Breaker - 60V 200Amp - Nader DC Circuit Breaker 60V 200Amp angled left
Nader DC Circuit Breaker - 60V 200Amp - Nader DC Circuit Breaker 60V 200Amp angled right
$54.99 - $54.99
$54.99
$54.99 - $54.99
$54.99

Nader DC Circuit Breaker - 60V 200Amp

Nader

The Nader DC Circuit Breaker - 60V 200Amp is an electrical component from Nader — 60V; 240 Vac.Why It MattersOvercurrent protection and disconnects...

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$54.99 - $54.99
$54.99
$54.99 - $54.99
$54.99
Nader DC Circuit Breaker - 48V 125 Amp - Nader DC Circuit Breaker 48V 125 Amp top view
Nader DC Circuit Breaker - 48V 125 Amp - Nader DC Circuit Breaker 48V 125 Amp angled left
$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99

Nader DC Circuit Breaker - 48V 125 Amp

Nader

The Nader DC Circuit Breaker - 48V 125 Amp is an electrical component from Nader — 48V.Why It MattersThe components between the array and the panel...

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$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99
IMO DC Disconnect Rooftop Isolator Switch - 6 Pole - 3 String - IMO DC Disconnect Rooftop Isolator Switch front facing
$169.99 - $169.99
$169.99
$169.99 - $169.99
$169.99

IMO DC Disconnect Rooftop Isolator Switch - 6 Pole - 3 String

IMO Solar

The IMO DC Disconnect Rooftop Isolator Switch - 6 Pole - 3 String is an electrical component from IMO Solar — Product Type DC; Rooftop Isolator Swi...

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$169.99 - $169.99
$169.99
$169.99 - $169.99
$169.99
High Power Relay - 12VDC Coil - 120A 28VDC / 250VAC - High Power DC 12Vdc Relay for solar, shown from both front and rear in clear-blue enclosure
$19.00 - $19.00
$19.00
$19.00 - $19.00
$19.00

High Power Relay - 12VDC Coil - 120A 28VDC / 250VAC

Urban Supply

The High Power Relay - 12VDC Coil - 120A 28VDC / 250VAC is an electrical component — 12VDC; 120A.Why It MattersA relay or contactor is rated twice:...

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$19.00 - $19.00
$19.00
$19.00 - $19.00
$19.00
Growatt SYN 200-XH-US-11A - 200A Automatic Transfer Switch - Left tilt view of Growatt SYN 200A automatic transfer switch
Growatt SYN 200-XH-US-11A - 200A Automatic Transfer Switch - Front view of Growatt SYN 200A automatic transfer switch
$1,443.00 - $1,443.00
$1,443.00
$1,443.00 - $1,443.00
$1,443.00

Growatt SYN 200-XH-US-11A - 200A Automatic Transfer Switch

Growatt

The Growatt SYN 200-XH-US-11A - 200A Automatic Transfer Switch is an electrical component from Growatt — 11A; 13A.Why It MattersOvercurrent protect...

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$1,443.00 - $1,443.00
$1,443.00
$1,443.00 - $1,443.00
$1,443.00
Enphase IQ Combiner 5 - Enphase IQ Combiner 5 front facing
$829.99
$829.99 - $829.99
$829.99
$710.00
$710.00 - $710.00
$710.00

Enphase IQ Combiner 5

Enphase Energy

The Enphase IQ Combiner 5 is an electrical component from Enphase Energy — 240 VAC; 80 A.Why It MattersBreakers, disconnects and switchgear must ma...

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$829.99
$829.99 - $829.99
$829.99
$710.00
$710.00 - $710.00
$710.00
BSB 125A AC Circuit Breaker - EG4 125A DC Circuit Breaker side view
$47.99
$47.99 - $47.99
$47.99
$43.99
$43.99 - $43.99
$43.99

BSB 125A AC Circuit Breaker

BSB

The BSB 125A AC Circuit Breaker is an electrical component from BSB — Product Type AC; Circuit Breaker Current Rating 125A.Why It MattersBreakers, ...

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$47.99
$47.99 - $47.99
$47.99
$43.99
$43.99 - $43.99
$43.99
Eaton CSR Main Breaker 200A - Left tilt View Eaton CSR Main Breaker | 2 Pole | 200A
$134.00 - $134.00
$134.00
$134.00 - $134.00
$134.00

Eaton CSR Main Breaker 200A

Eaton

The Eaton CSR Main Breaker 200A is an electrical component from Eaton — 200A; 240V.Why It MattersBreakers, disconnects and switchgear must match th...

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$134.00 - $134.00
$134.00
$134.00 - $134.00
$134.00
Eaton 80A Breaker - 120/240V - Left tilt view of 80A Eaton breaker
$82.99 - $82.99
$82.99
$82.99 - $82.99
$82.99

Eaton 80A Breaker - 120/240V

Eaton

The Eaton 80A Breaker - 120/240V is an electrical component from Eaton — 80A; 240V.Why It MattersBreakers, disconnects and switchgear must match th...

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$82.99 - $82.99
$82.99
$82.99 - $82.99
$82.99
Eaton 90A Breaker - 90A 2 POLE - 120/240V - Left Tilt View Eaton 90A 2 Pole Breaker
$70.00 - $70.00
$70.00
$70.00 - $70.00
$70.00

Eaton 90A Breaker - 90A 2 POLE - 120/240V

Eaton

The Eaton 90A Breaker - 90A 2 POLE - 120/240V is an electrical component from Eaton — 90A; 90 A.Why It MattersBreakers, disconnects and switchgear ...

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$70.00 - $70.00
$70.00
$70.00 - $70.00
$70.00
Eaton 60A Breaker - 120/240V - Left tilt view of 60A Eaton Breaker
$18.99 - $18.99
$18.99
$18.99 - $18.99
$18.99

Eaton 60A Breaker - 120/240V

Eaton

The Eaton 60A Breaker - 120/240V is an electrical component from Eaton — 60A; 240V.Why It MattersThe components between the array and the panel are...

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$18.99 - $18.99
$18.99
$18.99 - $18.99
$18.99
Eaton 125A Breaker - 125A / 2 POLE - 120/240V - Left Tilt View Eaton 125A Breaker | 2 Pole
$109.00 - $109.00
$109.00
$109.00 - $109.00
$109.00

Eaton 125A Breaker - 125A / 2 POLE - 120/240V

Eaton

The Eaton 125A Breaker - 125A / 2 POLE - 120/240V is an electrical component from Eaton — 125A; 125 A.Why It MattersBreakers, disconnects and switc...

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$109.00 - $109.00
$109.00
$109.00 - $109.00
$109.00
Eaton 70A Breaker - 70A / 2 POLE - 120/240V - Left tilt view Eaton 70A 2 Pole Breaker
$58.00 - $58.00
$58.00
$58.00 - $58.00
$58.00

Eaton 70A Breaker - 70A / 2 POLE - 120/240V

Eaton

The Eaton 70A Breaker - 70A / 2 POLE - 120/240V is an electrical component from Eaton — 70A; 240V.Why It MattersOvercurrent protection and disconne...

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$58.00 - $58.00
$58.00
$58.00 - $58.00
$58.00
Eaton 50A Breaker - 50A 2 POLE - 120/240V - Left tilt view Eaton 50A 2 Pole Breaker
$19.56
$19.56 - $19.56
$19.56
$18.00
$18.00 - $18.00
$18.00

Eaton 50A Breaker - 50A 2 POLE - 120/240V

Eaton

The Eaton 50A Breaker - 50A 2 POLE - 120/240V is an electrical component from Eaton — 50A; 50 A.Why It MattersOvercurrent protection and disconnect...

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$19.56
$19.56 - $19.56
$19.56
$18.00
$18.00 - $18.00
$18.00

How to Choose

Size on current and voltage, with margin. DC breakers and disconnects must be rated for DC — an AC-rated breaker will not interrupt a DC arc and is a fire risk, not merely a code violation. Transfer switches are chosen by service size, most commonly 200A for a US home, and by whether you need automatic or manual operation: automatic costs more but means the house recovers without anyone being home. Busbars are sized by total current, and it is worth buying more capacity than you need now so the next battery does not force a rebuild.

Key Specifications Explained

  • DC rating: Breakers and disconnects must be DC-rated, not AC-rated
  • Transfer switch: 200A is standard for a US residential service; automatic or manual
  • Busbars: Rated up to 600A; size for future capacity, not today's load
  • Load centers: Pre-wired balance of system saves a day of enclosure fabrication
  • Listing: UL 67, UL 489 and UL 1008 depending on device class

Brands We Carry

EG4 Electronics, Eaton, Growatt, Tigo Energy, OutBack Power, MidNite Solar, Schneider Electric and IMO Solar.

Frequently Asked Questions

Can I use an AC breaker on the DC side?

No. DC arcs do not self-extinguish at a zero crossing the way AC does. Use DC-rated devices on every DC circuit, without exception.

Automatic or manual transfer switch?

Automatic if the house needs to recover with nobody home — refrigeration, sump pumps, medical equipment. Manual is cheaper and fine for a cabin.

What size busbar?

Total the maximum current of everything landing on it, then step up a size. Busbars are cheap; rebuilding a battery enclosure is not.

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