SGS5-40P is a dedicated DC surge protective device designed for photovoltaic (PV) systems. It features a compact 2P structure suitable for 1500V DC applications, supports remote signaling for real-time status monitoring, and provides reliable lightning and surge protection for PV combiner boxes and solar power arrays.
Key Features
Product Functions
- Surge & Lightning Protection: Absorbs instantaneous high voltage caused by lightning or grid fluctuation.
- Remote Signaling: Monitors the internal chip status remotely, facilitating intelligent O&M.
- Compact Structure: Saves installation space in PV combiner boxes.
- Stable Performance: Ensures long-term safe operation of solar power systems.
Technical Parameters
Maximum Continuous
Operating Voltage
(Uc) | Nominal Discharge
Current
(In)(8/20μs) | Protection Level
(In)Up |
| DC 500V | 5KA-30KA | ≤1.5kV |
| DC 750V | ≤1.8kV |
| DC 1000V | ≤3.2kV |
| DC 1500V | ≤5.2kV |
Company Introduction
Zhejiang Singi Electrical LLC
SINGI is a professional manufacturer of PV and DC electrical protection devices, focusing on photovoltaic surge protection, DC circuit breakers, MCBs, and new energy safety components. With mature R&D, strict quality control, and rich industry experience, SINGI provides reliable, certified protection solutions for global photovoltaic, energy storage, and EV charging systems.
FAQ
Q: Why must PV systems use dedicated DC SPD instead of ordinary AC SPD?
A: PV systems output pure DC voltage without a zero‑crossing point. Ordinary AC SPD cannot extinguish DC arcs after surge action, which may cause burnout or fire. SGS5‑40P uses a DC‑optimized structure to ensure safe cut‑off and long‑term stability.
Q: What is the function of remote signaling in SGS5‑40P, and why is it important for PV stations?
A: Remote signaling outputs a switch signal when the SPD’s internal protection chip fails or ages. For large‑scale PV power stations (especially unattended ones), this function enables remote fault monitoring, avoids blind maintenance, and ensures continuous system safety.
Q: Why does the protection level (Up) increase as the DC voltage rises from 500V to 1500V?
A: Higher system voltage requires a higher internal breakdown threshold to avoid malfunction tripping under normal working voltage. The protection level is designed to match the voltage level while limiting residual voltage to a safe range for PV inverters and components.
Q: How does the SGS5‑40P SPD protect key equipment like PV inverters?
A: When lightning or surge induces high voltage on DC cables, the SPD quickly clamps the voltage to a safe level, absorbing excess energy to prevent inverter internal boards, capacitors, and IGBT modules from breakdown or damage.
Q: Can this SPD be used in both 1000V and 1500V PV systems?
A: Yes. SGS5‑40P provides full voltage specifications from 500V to 1500V. You can select the corresponding model based on your system’s nominal DC voltage. It is widely compatible with old 1000V and new 1500V PV plants.
Q: How long is the service life of SGS5‑40P SPD, and when should it be replaced?
A: Service life depends on surge frequency and intensity. The remote signaling function will alarm when the module is exhausted. On average, it is recommended to check every 1–2 years and replace immediately when a fault signal is triggered.
Application Scenarios
- PV Combiner Boxes: String and module‑level surge protection
- Solar Power Stations: Utility, commercial, industrial PV plants
- PV Inverter Systems: DC input side surge protection
- Off‑grid Solar Systems: Battery and panel circuit safety
- DC Power Distribution Cabinets: Lightning and surge protection
- Unattended PV Stations: Remote monitoring and intelligent O&M
