AC and DC isolators
These DC isolators from Kraus and Naimer are designed specifically for PV installations. With interlocked lids (the lid cannot be removed if the switch is in the 'on' position), padlockable switches, and IP66/67 rated enclosures, they are an excellent, safe choice - and for a quality switch from a European manufacturer, remarkably well priced.
The KGD40 can cope with up to 50A at 1000V and new permanent magnet technology in the contact body greatly reduce arcing time, improving safety standards. They are also non-polarity sensitive.
The ratings provided in the table below are in accordance with the requirements of IEC/EN 60947-3, utilization category DC-21B. Ratings in accordance with DC-21B are suitable for use in the selection of an isolator to isolate a PV string input to a PV inverter.
DC 21B Ratings
|25A||21A||20A||18A||11A||KG20 T104/D-P003 KL51V|
|25A||23A||15A||12A||KG32 T104/D-P003 KL11V|
|30A||30A||KGD40 TD102/D-P003 KL11V|
|40A||40A||30A||20A||20A||KGD40 TD103/D-P003 KL11V|
|50A||50A||40A||40A||30A||30A||KGD40 TD104/D-P003 KL11V|
|50A||40A||40A||KGD40B TD106/D-P003 KL11V|
|50A||50A||50A||KGD40B TD108/D-P003 KL11V|
Traditional rotary-switch isolators also from Kraus and Naimer offer excellent value.
We also have larger isolators for the higher current three-phase installations.
Kraus Naimer Newbury AC Isolator 20A 4 Pole NEW204P
€15.60Kraus & Naimer Rotary AC isolator 20A, 4 Pole, IP66, can be padlocked in off position.
Kraus and Naimer DC Isolator - KG20-4
€27.30Padlockable DC isolator suitable for almost all domestic PV arrays of up to 4kW.