Konrak RKD.E Enclosed DC Isolator Switch
A 4-pole DC switch-disconnector built into a sealed, wall-mounted IP66 enclosure, rated 1200 V DC at 32 A or 1500 V DC at 23 A. It is supplied with MC4 connectors, with configurable M20 glands, or pre-wired with solar cable — so the switch arrives ready for the string, and one lockable handle isolates the array.
The isolator on the DC side of the array
The RKD.E is mounted between the PV strings and the inverter — on the roof, on the wall beside the inverter, or at the array itself. The strings connect directly to it, and the lockable handle makes the DC side safe to work on.
Four ways to connect the array
The same enclosure is offered with different connection methods, so the switch can be matched to how the strings will actually be run. The wiring method is part of the model code.
A single PV string plugs straight into the enclosure. The MC4 connectors are fitted at the factory, so the box never has to be opened on the roof.
Two strings on one device, with four MC4 connectors factory-fitted on the sides. Both strings are isolated by a single lockable handle.
Four dual-port M20 cable glands on the M20 version allow the installer to wire 1-in-1-out, 2-in-1-out or 2-in-2-out on site with their own cable.
Supplied with factory-terminated solar cable and MC4 connectors already fitted — the fastest option when the array has to be wired quickly.
The suffix of the model code states the wiring arrangement: MC4 for one string, 2MC4 for two strings, M20 for site-configurable gland wiring, and PVC for the pre-terminated cable version.
Configurations and dimensions
Field-configurable wiring
On the M20 version the internal terminals can be linked or separated to give 1-in-1-out, 2-in-1-out or 2-in-2-out, so one enclosure covers several array layouts.
Panel layout and dimensions
Front and side dimensions, terminal positions and the external mounting holes. Note that the lid is never drilled, so the seal stays intact.
Drawings are for guidance. Please confirm the exact arrangement and dimensions for your order against the current drawing.
RKD.E technical data
| Product | Enclosed DC isolator switch — DC switch-disconnector in a sealed enclosure |
| Rated operational voltage (Ue) | 1200 / 1500 V DC |
| Rated current (In) | 32 A at 1200 V DC · 23 A at 1500 V DC |
| Poles | 4P |
| Rated impulse withstand voltage (Uimp) | 8 kV |
| Utilisation category | DC-PV1 / DC-PV2 to IEC/EN 60947-3 |
| Polarity | Non-polarised — either polarity may be connected |
| Enclosure | UV-resistant polycarbonate, flame-retardant, gasketted lid with stainless-steel screws |
| Internal switch body | Flame-retardant PBT |
| Conductors | Thickened copper with silver-tipped contacts |
| Protection | IP66 · IK10 impact resistance |
| Flame retardance | V-0 flame-retardant enclosure and switch body (self-extinguishing) |
| Operating temperature | −40 … +85 °C |
| Wiring options | MC4 connectors (1 in / 1 out or 2 in / 2 out) · four dual-port M20 glands (configurable) · pre-wired solar cable |
| Installation | Wall-mounted on external mounting holes — the sealed lid is not drilled |
| Altitude | up to 2000 m |
| Standards | IEC/EN 60947-3 · GB/T 14048.3 |
| Certification | CE · CCC · TUV · UKCA · CB · RoHS |
| Model | Wiring arrangement | Size L × W × H (mm) | Weight |
|---|---|---|---|
| RKD.E-MC4 | 1 in / 1 out, MC4 | 230 × 104 × 110 | 0.85 kg |
| RKD.E-2MC4 | 2 in / 2 out, MC4 | 157 × 180 × 110 | 0.90 kg |
| RKD.E-M20 | Configurable, M20 glands | 213 × 104 × 110 | 1.15 kg |
| RKD.E-PVC | 2 in / 2 out, pre-wired cable | 213 × 104 × 110 | 1.15 kg |
Built to be left outdoors
Sealed against the weather
A UV-resistant polycarbonate enclosure, closed with stainless-steel screws over a gasket, gives IP66 protection: driven rain, dust and sand stay outside.
Copper and silver contacts
Thickened copper conductors with silver-tipped contacts keep resistance and heat low at full rated current, inside a flame-retardant switch body.
Padlockable in OFF
The rotary handle locks in the 0 (OFF) position. The front carries the rating, the utilisation category and the IP rating for quick checking on site.
Why the RKD.E
IP66 sealed enclosure
A gasketted polycarbonate box keeps water, dust and sand out. Mount it outdoors at the array and leave it there.
Plug-and-play MC4
Pre-installed MC4 connectors mean the enclosure is never opened on site — connect the strings and close the job.
Three wiring methods
MC4 connectors, M20 glands with configurable in/out, or factory-terminated solar cable: the same switch, wired the way the project needs.
Non-polarised
Either polarity may be connected to either side of each pole, which removes the most common wiring error.
Copper and silver contacts
Thickened copper conductors with silver-tipped contacts give low resistance and a low temperature rise at full load.
Fully isolated circuit
In the OFF position the circuit is completely open, with a proper isolating gap and no residual arc.
Lockable in OFF
The handle takes a padlock in the OFF position for lock-out / tag-out during installation and maintenance.
−40 to +85 °C
A wide operating range, a UV-resistant housing and IK10 impact resistance for harsh and remote sites.
V-0 flame retardant
Both the enclosure and the internal switch body are V-0 flame-retardant: the material resists ignition and the flame self-extinguishes.
Certified worldwide
CE, CCC, TUV, UKCA, CB and RoHS — one part number can be shipped to European, UK and Chinese projects.
Where the RKD.E is used
Wherever a PV array has to be isolated on the DC side — a rooftop system, a commercial plant, a carport or a pumping station. The sealed enclosure suits positions where a panel-mounted switch cannot go.
The first link in the string protection chain
Before a string reaches the inverter it passes through a chain of protection: isolation, fusing, surge protection and a circuit breaker. The isolator is the first device the string meets — and the only one that gives a visible, lockable break.
The isolator is the first device the string meets after it leaves the array — and the only one in the chain that gives a visible, lockable break. Confirm the protective device ratings against your string design.
Residential and rooftop PV
At the array or at the inverter, the RKD.E gives the household array a single lockable point of isolation — and the sealed box copes with the weather.
Commercial and industrial arrays
On larger rooftop and ground-mounted plants, the RKD.E gives each string or sub-array its own lockable, weatherproof point of isolation.
Residential rooftop systems
One or two strings, mounted at the inverter or on the roof.
Commercial and industrial PV
Array and sub-array isolation in rooftop and ground-mounted plants.
Utility-scale plants
String-level isolation before the combiner and the inverter.
Battery energy storage
DC-side isolation for battery cabinets and storage systems.
EV charging and carports
DC isolation for solar carports and charging installations.
Solar pumping
Array isolation for irrigation and water-supply pumping systems.
Off-grid and remote sites
A sealed, self-contained isolator for sites with no service access.
Combiner boxes and junction boxes
Isolation close to the strings, before the DC cable run.
Maintenance and emergencies
A visible, lockable break for installers, service engineers and the fire service.
Application photographs are illustrative and may show typical installations; they do not depict a specific project.
Frequently asked questions
What is the RKD.E?
It is a 4-pole DC switch-disconnector built into a sealed IP66 enclosure — an enclosed DC isolator. It is mounted on the DC side of a PV system, at the array or at the inverter.
Which wiring arrangements are available?
Four: MC4 connectors for one string (1 in / 1 out); MC4 connectors for two strings (2 in / 2 out); four dual-port M20 cable glands that can be wired 1-in-1-out, 2-in-1-out or 2-in-2-out on site; and a pre-wired version supplied with factory-terminated solar cable.
What are the ratings?
1200 V DC at 32 A, or 1500 V DC at 23 A. The rated impulse withstand voltage is 8 kV.
Why is a non-polarised switch better?
Because either polarity may be connected to either side of each pole, there is no wrong way round — which removes a common source of installation error.
Can the enclosure be opened?
The wiring versions are designed so the lid need not be opened on site: the MC4 version plugs in, and the pre-wired version arrives terminated. Where the lid is opened, it is closed over a gasket with stainless-steel screws to restore the IP66 seal.
Can it be locked off?
Yes. The rotary handle can be padlocked in the 0 (OFF) position for lock-out / tag-out.
Is it suitable for outdoor use?
Yes. The enclosure is IP66, impact-resistant to IK10 and UV-resistant, and rated from −40 °C to +85 °C.
Which standards apply?
IEC/EN 60947-3 and GB/T 14048.3, utilisation categories DC-PV1 / DC-PV2.
What certifications does it carry?
CE, CCC, TUV, UKCA, CB and RoHS.
Is the enclosure flame retardant?
Yes. Both the enclosure and the internal switch body are V-0 flame-retardant and self-extinguishing.
Need an enclosed DC isolator for your array?
Tell us the system voltage, the number of strings and how the strings will be connected — MC4, cable glands or pre-wired cable — and our team will confirm the exact RKD.E model and can supply samples or OEM versions.
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