Schneider Electric has launched the Square D 1000 VDC disconnect switch, the first enclosed heavy-duty 1000 VDC solar disconnect on the market. The easy-to install switch functions as a local disconnect for a string of Photovoltaic (PV) panels and are designed for an extended life expectancy in harsh environments.
Problem: Commercial and utility-scale PV power plants are increasingly using higher voltages in order to improve overall plant efficiency. Systems up to 1000 V are becoming more popular. However, contrary to AC which has two zero crossings per cycle (16.6 ms)
DC current is more difficult to interrupt. When a DC circuit is in the open position an arc is generated between the switch contacts, this arc must be broken as fast as possible and in accordance with safety procedures.
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Solution: Suitable for both grounded and ungrounded PV systems, the Square D 1000 VDC disconnect switch offers a preconfigured solar solution and familiar enclosed safety switch design, with no additional components required. The extended life expectancy exceeds IEC 60947-3 mechanical endurance requirements by a factor of 18 and IEC 60947-1 electrical endurance requirements by a factor of 10.
Applications: Commercial and utility-scale PV power plants.
Platform: The NEMA Type 3 and IP63 enclosure is resistant to windblown dirt and dust and exceeds NEMA type 3R. It operates within a temperature range of -37°C to 50°C, using a white enclosure that can reduce solar gain by up to 35% over standard grey enclosures.
Availability: The Square D 1000 VDC disconnect switch is available now through regular Schneider Electric distribution channels.