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Home: SLE Solar Catalog: Accessories: Load Center:
Square-D safety switch disconnects
Cat. No. SD-SSD
Weight 3 lbs | |
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
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|
200
|
Yes
|
No
|
3**
|
SN20A
|
PKOGTA2
|
29.25 x 17.25 x 8.50
|
44
|
HU364RB
|
053-02364
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|
200
|
Yes
|
Yes
|
3**
|
SN20A
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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
|
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*** Switches are rated for 250VDC
but available fuses are only rated for 125VDC
|
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240-Volt AC Only NEMA 3R General
Duty Switches
|
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30
|
AC only
|
No
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2
|
N/A
|
PK3GTA1
|
9.63 x 7.25 x 3.75
|
4.4
|
DU221RB
|
053-02318
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|
30
|
AC only
|
Yes
|
2
|
included
|
PK3GTA1
|
9.63 x 7.25 x 3.75
|
4.5
|
D221NRB
|
053-02326
|
|
30
|
AC only
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No
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3
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N/A
|
PK3GTA1
|
9.63 x 7.25 x 3.75
|
4.7
|
DU321RB
|
053-02319
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|
30
|
AC only
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Yes
|
3
|
included
|
PK3GTA1
|
9.63 x 7.25 x 3.75
|
5.1
|
D321NRB
|
053-02329
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60
|
AC only
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Yes
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2
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included
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GTK03
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14.88 x 6.63 x 4.88
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9.7
|
D222NRB
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053-02334
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|
60
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AC only
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No
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3
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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
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053-02343
|
|
100
|
AC only
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Yes
|
2
|
included
|
GTK0610
|
17.50 x 8.50 x 6.50
|
16
|
D223NRB
|
053-02358
|
|
100
|
AC only
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No
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3
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N/A
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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
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PKOGTA2
|
29.25 x 17.25 x 8.25
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30
|
D324NRB
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053-02372
|
|
|
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