DC Isolating Switch

Supports flexible wiring (Top/Bottom). The recommended terminal tightening torque is 2.5 Nm - 3.5 Nm (varies by model). Over-tightening may crack the housing; a torque screwdriver is recommended.

Suntree's IP66 waterproof isolating switch series features UV-resistant engineering plastic enclosures that effectively resist aging caused by long-term sunlight exposure, ensuring reliable long-term operation under outdoor conditions.

The SISO-40 series has a maximum rated insulation voltage of 1500V DC. The rated operational current varies depending on the pole configuration. For 2P in series at 1000V, the rated current is 16A, 25A, or 32A. For 2P in parallel at 600V, the rated current reaches 29A, 45A, or 50A. For 4P in series at 1200V, the rated current is 16A, 25A, or 32A. Customers should select the appropriate wiring method based on their system's actual voltage and current requirements.

Yes, the SISO series is a DC load disconnect switch featuring magnetic blow-out arc extinguishing technology. It is specifically designed to make and break load currents safely. However, please note that it cannot interrupt short-circuit currents – that requires an upstream circuit breaker.

The Suntree DC isolator with DC300V-1000V voltage range is mainly suitable for medium-sized solar PV systems, including commercial rooftop PV projects and residential photovoltaic power generation systems. This series is typically used for isolation and protection on the DC side of inverters, capable of safely connecting and disconnecting DC main circuits with infrequent operation. With its wide voltage range covering 300V to 1000V, this isolator can flexibly adapt to different PV array configurations. The product features a non-polarity design that requires no distinction between positive and negative terminals during installation, greatly simplifying on-site wiring work.

The SGL8N-2 series 1500V DC isolator is optimized for higher voltage levels, including enhanced insulation performance and higher rated impulse withstand voltage (Uimp up to 12kV). The 1500V model features a larger frame current design (up to 320A) and IP65 protection rating for external handles. Generally speaking, higher voltage isolators typically require larger clearances and creepage distances, as well as more robust arc extinguishing systems.

The life cycle parameters of Suntree DC isolators vary by model. The SISO series offers an electrical life of 3000 actual cycles (or 300 cycles under standard testing) and a mechanical life of 10000 cycles. Some series can achieve mechanical life of up to 100000 cycles. The SGL8N-2 series 1500V isolator offers a mechanical life of 8000 cycles and an electrical life of 1000 cycles. Overall, Suntree isolators are designed to meet infrequent operation requirements throughout the full life cycle of PV systems. Please refer to the technical specification sheet of specific product models for actual life cycle values.

The main difference between the Suntree SGL8N series load isolating switch and a standard isolator is its ability to break circuits under load. Standard isolators primarily provide visible isolation gaps and typically require operation under no-load current conditions. The SGL8N load isolating switch, however, features a spring-charged, instantaneous release acceleration mechanism and is equipped with a vacuum arc extinguishing chamber, allowing safe circuit interruption under load conditions.

Yes, the Suntree SGL8N series load isolating switches are designed to disconnect loads under rated current conditions.