EXG3DC-32 Series DC Isolator Switch
The EXG3DC-32 is a DC isolator switch rated 32A, up to 1200VDC. Designed for solar PV and DC circuit isolation. Available in 4-pole configuration with IP20 indoor or IP66 outdoor (EL model) enclosures. Mechanically non-polar. Compliant with IEC 60947-3, AS 60947.3. For safe disconnection of PV arrays and string inverters.
Standards: IEC 60947-3, AS 60947.3
Rated Current: 32A
Rated Voltage: 300V – 1200VDC
Poles: 4P
Use Category: DC-PV1 / DC-PV2
Enclosure: IP20 (indoor) / IP66 (EL, outdoor)
Applications: PV module isolation, inverter DC side disconnect
Product Information
EXG3DC-32 DC Isolator Switch – Safe Disconnection for Solar PV Up to 1200V
The EXG3DC-32 Series DC Isolator Switch from HUYU Electric provides safe and reliable isolation of DC circuits for use in photovoltaic systems and industrial DC applications. The switch is manufactured in accordance with IEC 60947-3 and AS 60947.3. The switch supports operation voltages of 300V-1200V DC and a maximum rated current of 32A. As a dedicated solar DC isolator switch, the switch’s 4-pole configuration allows for both grounded and ungrounded PV arrays. This means that isolation can happen simultaneously on both positive and negative conductors.
The switch’s compact design allows for mounting on standard DIN rails (IP20 version) or can be installed in outdoor junction boxes (IP66 EL version). Its mechanically non-polar construction permits “+” and “-” terminals to be interchanged, simplifying wiring and reducing installation errors. If you are looking for a reliable solar DC disconnect switch for solar combiner boxes, string inverters, or DC load disconnection, HUYU Electric supplies OEM/ODM solar disconnect switches directly from the factory with complete compliance certifications and documentation for your projects.
Technical Data and Isolation Performance
| Parameter | Value |
|---|---|
| Model | EXG3DC-32 / EXG3DC-32EL (outdoor) |
| Function | Isolation, control |
| Standards | IEC 60947-3, AS 60947.3 |
| Use Category | DC-PV1 / DC-PV2 |
| Poles | 4P |
| Rated Operating Voltage Ue | 300V / 600V / 800V / 1000V / 1200V DC |
| Rated Insulation Voltage Ui | 1200V |
| Rated Short-time Withstand Icw | 1kA/1s (4,4,4B), 1.7kA/1s (2H) |
| Impulse Withstand Uimp | 8.0kV |
| Polarity | Mechanically non-polar |
| Mechanical / Electrical Life | 9,700 / 300 cycles |
| Protection Degree | IP20 (indoor) / IP66 (EL model) |
| Operating Temperature | -40°C to +85°C (storage) |
| Installation | Vertical or horizontal, DIN rail |
The EXG3DC-32 is rated as DC-PV1 and DC-PV2 for photovoltaic isolation under fault conditions, confirming its safety advantages. Its mechanically non-polar design minimizes the risk of polarity errors, enhancing safety in the field. Whether for a PV array DC isolator switch in rooftop systems or a 1000V DC isolator for commercial inverters, the EXG3DC-32 is an ideal solution for globally compliant installations.
Designed for Solar PV & Harsh Environments
The EXG3DC-32EL features an IP66-rated enclosure, suitable for outdoor installations without additional weather protection. The IP20 version is tailored for DIN rail mounting in indoor combiner boxes or inverter cabinets. Both versions use a common 4-pole switch mechanism designed with advanced arc extinguishing techniques, ensuring safe DC circuit disconnection even under load. This makes it a comprehensive solar DC isolator switch solution for modern residential and commercial PV systems.
Technical Specifications
| Product Model | EXG3DC-32 Series DC Isolator Switch |
| Rated Current Ie | 32A |
| Rated Voltage Ue | 300V / 600V / 800V / 1000V / 1200V DC |
| Poles | 4P |
| Use Category | DC-PV1, DC-PV2 |
| Enclosure Options | IP20 (indoor) / IP66 (EL, outdoor) |
| Polarity | Non-polar (interchangeable) |
| Standards | IEC 60947-3, AS 60947.3 |
| MOQ | Contact for project quotation |
Get a Quote for EXG3DC-32 DC Isolators
32A 1200VDC, 4P, IP20/IP66 Certified to IEC/AS for DC Isolators in PV Arrays & String Inverters. OEM/ODM with full documentation provided; contact us for current pricing and availability timelines.
Quote based on project requirements • Complies with IEC 60947-3 • Ships Worldwide.
OEM & ODM Supply – Verified DC Isolation Switches for Solar PV
EXG3DC-32 DC Isolator Switch – Innovatively Designed for Solar Applications
The EXG3DC-32 DC Isolator Switch conforms to the advanced requirements of modern photovoltaic installations. With its high voltage tolerance of up to 1200V, compact build, and adherence to both IEC and AS standards, it provides a trusted safety measure for PV projects. As a DC Isolator Switch, it is often used between PV panels and inverters, ensuring visible disconnection for safety, especially crucial during maintenance or emergencies. The IP66 EL model is particularly designed for rooftop setups, eliminating the need for additional enclosures.
Choosing the Best DC Isolator Switch for Solar PV Installations
Four Key Considerations for Selecting the EXG3DC-32 DC Isolator for PV Systems
1. Voltage Rating and Compatibility
Modern PV systems often reach 1000V or 1500V open-circuit voltage. The EXG3DC-32’s 1200V rating handles 1000V DC isolator applications, leaving necessary safety margins. To ensure compatibility, verify the isolator’s rating exceeds the string voltage, factoring in temperature variations.
2. Suitable Enclosure
For indoor installations, the IP20 version is cost-efficient and ideal for combiner boxes or inverters shielded from weather. For rooftop PV arrays or exposed environments, the IP66-rated EXG3DC-32EL provides weather resistance without requiring extra enclosures, reducing total installation costs.
3. Four-Pole Configuration with Flexibility
The 4-pole design is suitable for series configurations to increase voltage capacity or to isolate both poles in ungrounded arrays. Its non-polarity feature simplifies wiring, reducing errors during installation and commissioning processes.
4. Compliance with Global Standards
The EXG3DC-32 meets IEC 60947-3 and AS 60947.3 standards, fulfilling the requirements of international regions like Europe and Australia. Verify your local installation codes for DC-PV1 or DC-PV2, and contact HUYU Electric for support on certification needs.
Frequently Asked Questions
What is a DC isolator switch?
A DC isolator switch is a manually operated disconnecting device designed to safely isolate a DC circuit from its power source. Unlike a circuit breaker, its primary function is not to interrupt fault currents but to provide a visible isolation gap for maintenance, emergency shutdown, or system commissioning. The EXG3DC-32 solar DC isolator switch is built for photovoltaic applications, meeting the DC-PV1 and DC-PV2 use categories. It is installed between the PV array and the inverter to allow safe disconnection of DC power during service or firefighting operations.
What is the difference between a DC breaker and a DC isolator?
A DC circuit breaker is designed to automatically open under overcurrent or short-circuit conditions, protecting cables and equipment from damage. A DC isolator switch is a manually operated device intended to disconnect a circuit under load or no-load conditions for safety isolation, not to clear faults. The EXG3DC-32 as a pv array dc isolator switch provides secure isolation for maintenance personnel but does not include overcurrent tripping; it relies on upstream fuses or breakers for fault protection. Both devices are often used together in a PV system: breakers for protection, isolators for disconnection.
What is an isolator switch?
An isolator switch is a manual disconnector that ensures a circuit is completely de-energized and provides a visible break for safety. In AC or DC systems, it is used to isolate equipment before maintenance or in emergencies. A DC disconnect switch like the EXG3DC-32 fulfills this role in DC circuits, with the added requirement of extinguishing the DC arc that forms during opening. The switch’s 4-pole design and DC-PV rating confirm its ability to break DC under load, making it a true isolator rather than simply an off-load disconnect.
What does DC isolation mean?
DC isolation refers to the complete separation of a DC circuit from its energy source, ensuring no current can flow to the load side. This is achieved by opening all live conductors (positive and negative) simultaneously. The EXG3DC-32 DC isolator switch accomplishes this with a mechanically interlocked 4-pole mechanism, providing galvanic isolation between the PV array and the inverter. Effective DC isolation is a critical safety requirement in solar installations to protect firefighters and service personnel from the risk of DC electric shock, even when the inverter is shut down.
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