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A DC isolator switch is an electrical safety device that manually disconnects itself from the modules in a solar PV system. In PV applications, DC isolator switches are used to manually disconnect the solar panels for maintenance, installation or repair purposes.
In most solar PV installations, two DC isolator switches are connected to a single string. Normally, one switch is placed close to the PV array and the other close to the DC end of the inverter. This is to ensure that disconnection can be achieved at ground and roof level. DC isolators can come in polarized or non-polarized configurations. For DC isolator switches that are polarized, they come in two, three and four pole configurations.
|
Utilization category DC-PV1/DC-PV2 |
Series |
No.of Strings |
Part Number |
Contact Configuration |
|||||||
|
500V |
600V |
700V |
800V |
900V |
1000V |
1200V |
1500V |
||||
|
32 |
32 |
32 |
32 |
23 |
16 |
13 |
7 |
2 |
1 |
EKD6-DC32R-2 |
|
|
58 |
58 |
58 |
45 |
23 |
16 |
13 |
7 |
4 |
1 |
EKD6-DC32R-2H |
|
|
32 |
32 |
32 |
32 |
23 |
16 |
13 |
7 |
2 |
2 |
EKD6-DC32R-4 |
|
|
32 |
32 |
32 |
32 |
32 |
32 |
32 |
23 |
4 |
1 |
EKD6-DC32R-4S |
|
|
32 |
32 |
32 |
32 |
32 |
32 |
32 |
23 |
4 |
1 |
EKD6-DC32R-4B |
|
|
32 |
32 |
32 |
32 |
32 |
32 |
32 |
23 |
4 |
1 |
EKD6-DC32R-4T |
|
|
Main Parameters |
DC32R |
|
|
Rated insulation voltage Ui |
1500V |
|
|
Rated thermal current Ithe |
32A |
|
|
Rated impulse withstand voltage Uimp |
8000V |
|
|
Rated short-circuit making capacity Icm |
2H |
1700A |
|
2,4 |
1000A |
|
|
2H |
1700A |
|
|
Rated conditional short-circuit current Icc |
5000A |
|
|
Max. fuse size gL (gG) |
80A |
|
| Maximum cable cross sections (incl. jumper) | ||
| Solid or standard | mm2 | 4-16 |
| Flexible | 4-10 | |
| Flexible (+ multicore cable end) | 4-10 | |
| Torque | ||
| Tightening torque terminal screws M4. | Nm | 1.2-1.8 |
| Tightening torque panel mounting screws ST4.2(304 stainless steel) | 0.8-0.9 | |
| Tightening torque knob screws M3 | 0.5-0.7 | |
| Switching on or off torque | 0.9-1.3 | |
| General parameters | ||
| Method of mounting | ||
| Type of knob | C | |
 |
||
| Knob positions | OFF at 12 hr, ON at 3 hr | |
| Mechanical life | 10000 | |
| Number of DC poles | 2 or 4 | |
| Operation temperature | -40℃ to +70℃ | |
| Storage temperature | -40℃ to +85℃ | |
| Pollution degree | 2 | |
| Overvoltage category | III | |
| IP rating of shafte and mounting nut | IP66 | |
| Reference No. | Specification |
| EKD6-DC32R-2 | DC Isolator 2P 32A 2series /1strings Top to Bottom Connection Red/Yellow PL64 Shaft 135mm |
| EKD6-DC32R-2H | DC Isolator 4P 32A 4series /1strings Top to Bottom Connection Red/Yellow PL64 Shaft 135mm |
| EKD6-DC32R-4 | DC Isolator 4P 32A 4series /2strings Red/Yellow PL64 Shaft 135mm |
| EKD6-DC32R-4S | DC Isolator 4P 32A 4series /1(3+1) string Top to Bottom Connection Red/Yellow PL64 Shaft 135mm |
| EKD6-DC32R-4B | DC Isolator 4P 32A 4series /1(2+2) string Bottom Connection Red/Yellow PL64 Shaft 135mm |
| EKD6-DC32R-4T | DC Isolator 4P 32A 4series /1(2+2) string Top Connection Red/Yellow PL64 Shaft 135mm |
A DC isolator switch is an electrical safety device that manually disconnects itself from the modules in a solar PV system. In PV applications, DC isolator switches are used to manually disconnect the solar panels for maintenance, installation or repair purposes.
In most solar PV installations, two DC isolator switches are connected to a single string. Normally, one switch is placed close to the PV array and the other close to the DC end of the inverter. This is to ensure that disconnection can be achieved at ground and roof level. DC isolators can come in polarized or non-polarized configurations. For DC isolator switches that are polarized, they come in two, three and four pole configurations.
