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Square-D safety switch disconnects
Cat. No. SD-SSD

According to the National Electric Code, section 690.15, PV arrays must have a disconnecting means to isolate the inverter from the PV power source. Utility grid-tie inverters that utilize PV arrays with voltages above 250VDC require a disconnect rated for 600VDC to perform this function. The Square-D 600VDC 30-amp 3-pole safety switches are UL Listed to handle 13A at 600VDC per pole. They can be used for disconnecting up to three PV arrays for three grid-tie inverters. It has wiring lugs that are rated to accept two #14 to #10 wires in each lug.

This allows the disconnect switch to also act as a string combiner in systems that utilize two strings of PV modules per inverter. The 600VDC 60-amp 3-pole safety switches are UL Listed to handle 38A at 600VDC per pole. All other Square-D 600VDC disconnects are rated for disconnecting one string at full rated power.

Many utilities require an AC disconnect between a grid-tie inverter and the AC load center, close to the AC service entrance, with a visible and lockable handle. A 30-amp 240-volt disconnect is good for up to 5kW at 240 VAC and the 60-amp disconnect is good for up to 11kW. For connection of multiple inverters to one of these disconnects, use an AC load center, with a circuit breaker for each inverter installed, as an AC combiner box between the inverters and the disconnect switch. The breakers can be back-fed with the inverter outputs and the load center main lugs will handle the combined outputs to be connected to the AC disconnect.

Use Class R fuses of the proper amperage for fused disconnects.

Disconnect Accessories

Use the hubs listed in the ordering table at the top of the page to connect conduit or a kWh meter socket to the top of the disconnect. Disconnects are raintight (NEMA 3R) for outdoor use. Order a neutral busbar and ground busbar if you need to land these conductors in the disconnect switch box. See table below to determine which neutral and ground to use.


Amps

AC / DC

Fused

Poles

Neutral kit

 Ground kit  Dimensions (in)
H x W x D

Weight (lbs)

Square-D model

Item code

600-Volt AC or DC 3-Pole NEMA 3R Heavy Duty Switches

30

Yes

No

3*

SN03

GTK03

14.88 x 6.63 x 4.88

9.3

HU361RB

053-02312

30

Yes

Yes

3*

SN03

GTK03

14.88 x 6.63 x 4.88

9.8

H361RB

053-02313

* Uses 2 poles in series for 600VDC, except for PV where all 3 poles may be used for 600VDC at 13 amps per pole

60

Yes

No

3**

SN0610

GTK0610

17.50 x 9.00 x 6.38

16

HU362RB

053-02339

60

Yes

Yes

3**

SN0610

GTK0610

17.50 x 9.00 x 6.38

16

H362RB

053-02341

100

Yes

No

3**

SN0610

GTK0610

21.25 x 8.50 x 6.38

24

HU363RB

053-02357

100

Yes

Yes

3**

SN0610

GTK0610

21.25 x 8.50 x 6.38

24

H363RB

053-02355

200

Yes

No

3**

SN20A

PKOGTA2

29.25 x 17.25 x 8.50

44

HU364RB

053-02364

200

Yes

Yes

3**

SN20A

PKOGTA2

29.25 x 17.25 x 8.50

44

H364RB

053-02374

** Uses 2 poles (and 2 fuses) in series for 600VDC

240-Volt AC / 125-Volt DC*** NEMA 3R Heavy Duty Switches

30

Yes

Yes

3

included

GTK03

14.88 x 6.63 x 4.88

9.8

H321NRB

053-02315

60

Yes

Yes

3

included

GTK03

14.88 x 6.63 x 4.88

10

H322NRB

053-02336

100

Yes

Yes

3

included

GTK0610

21.25 x 8.50 x 6.38

19

H323NRB

053-02351

200

Yes

Yes

3

included

PKOGTA2

29.25 x 17.25 x 8.50

43

H324NRB

053-02363

*** Switches are rated for 250VDC but available fuses are only rated for 125VDC

240-Volt AC Only NEMA 3R General Duty Switches

30

AC only

No

2

N/A

PK3GTA1

9.63 x 7.25 x 3.75

4.4

DU221RB

053-02318

30

AC only

Yes

2

included

PK3GTA1

9.63 x 7.25 x 3.75

4.5

D221NRB

053-02326

30

AC only

No

3

N/A

PK3GTA1

9.63 x 7.25 x 3.75

4.7

DU321RB

053-02319

30

AC only

Yes

3

included

PK3GTA1

9.63 x 7.25 x 3.75

5.1

D321NRB

053-02329

60

AC only

Yes

2

included

GTK03

14.88 x 6.63 x 4.88

9.7

D222NRB

053-02334

60

AC only

No

3

N/A

PK3GTA1

9.63 x 7.25 x 3.75

5

DU322RB

053-02342

60

AC only

Yes

3

included

GTK03

14.88 x 6.63 x 4.88

9.8

D322NRB

053-02343

100

AC only

Yes

2

included

GTK0610

17.50 x 8.50 x 6.50

16

D223NRB

053-02358

100

AC only

No

3

N/A

GTK0610

17.50 x 8.50 x 6.50

15

DU323RB

053-02359

100

AC only

Yes

3

included

GTK0610

17.50 x 8.50 x 6.50

16

D323NRB

053-02361

200

AC only

Yes

2

included

PKOGTA2

29.25 x 17.25 x 8.25

29

D224NRB

053-02371

200

AC only

Yes

3

included

PKOGTA2

29.25 x 17.25 x 8.25

30

D324NRB

053-02372



Model:





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