NEN 1010 §712.537.2.2.5
PV DC isolator
DC-scheider (PV-string)
Also known as: dc-separator, pv-switch, dc-scheider, dc-isolator, stringscheider
DC disconnect in each PV string cable directly before the inverter, allowing the array to be de-energized for maintenance without interrupting high voltage at the module box. Mandatory per NEN 1010 §712, suitable for DC operating voltage (Voc × 1.15) and with polarity-correct connection sequence.
Practical example
DC disconnect switch (PV string) Before inverter maintenance, the DC disconnect in the string cable is opened first, so the panel array is de-energized on the inverter side.
Common mistake
DC disconnect (PV string) Common mistake: Using an AC disconnect as DC — AC disconnects cannot extinguish DC arcs and may catch fire.
See also
Related terms
In-depth guides
- → IEC 63027 DC arc-fault detection in PV strings — supplementary fire protection (IEC 63027)
- → §131 Protection Principles
- → §411.3.2 Automatic disconnection of supply (AUV)
- → §413.3 Electrical separation (§413.3) — an isolating transformer as a protective measure without earthing
- → §528 (IEC 60364-5-52) §528 — Proximity to non-electrical services: why a cable should not just run next to a gas pipe
- → §710 Medical locations (§710) — Group 2 IT system, isolating transformer and insulation monitoring
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