SINGI SGDSE-32 PV DC isolator switch with IP66, lockable knob, ≤5ms switching time, 16-32A 1500V DC, compliant with IEC60947-3. Ideal for solar PV panel-inverter isolation.
SINGI SGDSE-32 is a professional PV external DC isolator switch designed for solar PV systems, complying with IEC60947-3 and AS60947.3 DC-PV2 standards. As a vital safety part between PV panels and inverters, it delivers reliable DC isolation, emergency shutdown and maintenance protection. Supporting up to 1500V DC, 16-32A selectable current, IP66 protection, lockable knob and ≤5ms fast switching, it suits indoor and outdoor PV installations and guarantees stable system safety.
Technical Parameters
Parameter
Specification
Rated Current (In)
16A, 20A, 25A, 32A
Rated Working Voltage (Ue)
≤1500V DC
Rated Insulation Voltage (Ui)
1500V DC
Maximum On-off Switching Time
≤5ms
Knob Feature
Lockable (safety maintenance)
Protection Grade
IP66 (dust-tight, waterproof)
Compliant Standards
IEC60947-3, AS60947.3 DC-PV2
Product Type
PV External DC Isolator Switch
Core Application
Solar PV panel & inverter isolation
Product Application Scenarios
Residential Rooftop PV Systems: External wall-mounted isolation between household solar panels and on-grid inverters (≤10kW), suitable for outdoor roof/wall harsh environments.
Industrial & Commercial Rooftop PV: Isolation protection for medium and large commercial PV systems (10kW-10MW) with multiple string inverters, matching 1000V/1500V DC PV systems.
Ground-mounted PV Power Stations: Outdoor DC isolation for small and medium ground-mounted PV projects, with IP66 protection against rain, dust and extreme temperatures.
Off-grid PV Systems: Safe isolation between PV panels and charge controllers/inverters in off-grid solar systems (e.g., rural power supply, mobile PV stations).
PV System Maintenance: Lockable knob for safe disconnection during PV panel, inverter and wiring maintenance to prevent electric shock hazards.
About the Manufacturer
Zhejiang Singi Electrical LLC is a leading high-tech enterprise specializing in the R&D, production and sales of low-voltage electrical equipment, with a core focus on PV special electrical products. The company has a professional R&D team with in-depth technical accumulation in photovoltaic electrical safety, and all PV products are designed and manufactured in strict compliance with IEC, AS and national GB standards, and have obtained international certifications such as CE, TUV and domestic CCC.
Singi Electric is committed to providing reliable, safe and high-performance electrical solutions for global photovoltaic power generation, industrial and commercial distribution and residential electricity fields. Its PV product line covers DC isolator switches, residual current circuit breakers, PV grid-connection protectors and other core components, and has established long-term cooperative relationships with well-known PV enterprises and EPC contractors worldwide.
Official Website: https://www.singi.comCore PV Products: DC isolator switches, PV special RCDs, grid-connection circuit breakersService Commitment: Factory product testing, global technical support and after-sales service.
Frequently Asked Questions (FAQ)
Q: Why is the SGDSE-32 designed with a ≤5ms maximum on-off switching time for PV systems?
A: PV DC systems generate high-energy DC arcs when switching at low speeds, which can cause equipment burning, fire and even PV module damage. The ≤5ms ultra-fast switching time of the SGDSE-32 effectively suppresses the generation and spread of DC arcs, complying with the DC arc protection requirements of IEC60947-3 DC-PV2 standard, and eliminating the arc hazard in PV system switching and disconnection.
Q: What is the significance of IP66 protection grade for a PV external DC isolator switch?
A: Most PV DC isolator switches are installed outdoors (rooftops, ground-mounted stations) and face harsh environmental conditions such as heavy rain, dust, high temperature and UV radiation. IP66 grade means the switch is completely dust-tight and can withstand powerful water jets from any direction, preventing internal circuit short circuits and insulation aging caused by dust and water ingress, and ensuring long-term stable operation in outdoor PV installation environments.
Q: Why is a lockable knob a necessary feature for PV DC isolator switches?
A: PV systems still have residual voltage and current in the DC side wiring even after grid disconnection, which poses a severe electric shock hazard for maintenance personnel. The lockable knob of the SGDSE-32 allows maintenance staff to lock the switch in the OFF position with a padlock during operation, preventing accidental closing by others, and meeting the safe maintenance requirements of PV system electrical safety regulations (IEC 61508).
Q: Can the SGDSE-32 be used for both 1000V DC and 1500V DC PV systems?
A: Yes. The SGDSE-32 has a rated working voltage of ≤1500V DC and rated insulation voltage of 1500V DC, which fully covers the two mainstream DC voltage levels of modern PV systems (1000V DC for small residential systems and 1500V DC for medium/large industrial/commercial PV systems). It is a universal DC isolator switch for 1000V-1500V DC PV applications without additional modification.
Q: What is the difference between the SGDSE-32 external DC isolator and internal DC isolators in PV inverters?
A: The built-in DC isolator in inverters only provides basic isolation for the inverter’s internal circuit, with low protection grade (usually IP20) and fixed current rating. The SGDSE-32 is an external dedicated isolation switch with IP66 outdoor protection, selectable current ratings (16A-32A) and a lockable knob. It is installed between PV panels and inverters to provide the first-level safe isolation for the entire PV DC side, and is a mandatory independent safety component required by PV system installation standards (IEC 60364-7-712).
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