SGDSC‑32 is a professional 4‑pole DC isolator switch specially designed for photovoltaic systems. It supports up to 1500V DC insulation voltage and 32A rated current, with 8kV impulse withstand voltage. Compliant with IEC and GB standards, it provides safe electrical isolation for PV combiner boxes and grid‑connected systems during installation, maintenance, and emergency shutdown.
Key Features
- 4P structure for full DC circuit isolation
- Rated insulation voltage: DC 1500V (suitable for modern high‑voltage PV systems)
- Rated impulse withstand voltage: 8000V (strong anti‑surge capability)
- Rated current: 32A
- Compliant with GB/T 14048.3 & IEC/EN 60947‑3
- Safe disconnection for maintenance and repair
- Compact design for PV combiner boxes
- DIN‑rail mounting for easy installation
- Stable performance in long‑term PV system operation
Technical Parameters
Insulation Voltage
(V) | Rated Impulse
Withstand Voltage
(V) | Pole | Shell Frame
Current
(A) | Executive
standards |
| DC 1500V | 8000V | 4P | 32A | GB/T 14048.3
IEC/EN 60947-3 |
Company Introduction
Zhejiang Singi Electrical LLC
SINGI is a professional manufacturer of PV and DC electrical components, focusing on circuit protection and safety equipment for photovoltaic, energy storage, and new energy systems. Our products comply with international IEC, EN, and national GB standards, with mature R&D, strict quality control, and global application experience. SINGI provides reliable, certified safety solutions for solar power stations, industrial DC systems, and clean energy projects worldwide.
FAQ
Q: Why do PV systems require a dedicated DC isolator instead of a regular AC isolator?A: DC current has no zero‑crossing point, making arc extinguishing extremely difficult. Ordinary AC isolators cannot safely break DC circuits and may cause arcing, burnout, or fire. SGDSC‑32 uses a DC‑optimized structure to ensure safe isolation in 1500V PV systems.
Q: What is the safety purpose of using SGDSC‑32 in a PV system?A: It provides visible disconnection for the entire DC circuit during installation, maintenance, or emergency situations. This protects technicians from electric shock and prevents accidental startup, which is mandatory for compliance and safety in all solar power systems.
Q: Why is 1500V DC insulation voltage critical for modern PV systems?A: New PV systems widely use 1500V technology to reduce current, lower losses, and improve efficiency. A 1500V‑rated isolator ensures safe isolation and long‑term reliability under high‑voltage string conditions.
Q: What does 8000V impulse withstand voltage mean for PV applications?A: It indicates the device can resist instantaneous high voltage caused by lightning, surges, or grid fluctuations without breakdown. This greatly improves system stability and protects downstream components like inverters and combiner boxes.
Q: Can SGDSC‑32 be used for both off‑grid and grid‑connected PV systems?A: Yes. It is designed for universal PV DC isolation. It works equally well in grid‑connected power stations, commercial PV systems, and off‑grid solar installations requiring safe disconnection.
Q: Why is a 4P structure needed for DC isolation in PV systems?A: 4P design ensures full disconnection of positive, negative, and associated circuits to achieve complete electrical separation. This eliminates residual voltage risks and meets global PV safety standards.
Application Scenarios
- PV Combiner Boxes: String and array safety isolation
- Grid‑Connected PV Power Stations: Centralized and distributed solar plants
- DC Power Distribution Cabinets: Circuit isolation and maintenance protection
- PV Inverter Systems: Input side safety disconnection
- Industrial & Commercial Solar Systems: High‑voltage 1500V PV applications
- Off‑Grid Solar Systems: Battery and panel circuit safety isolation
