JUTRION Electric
AC & DC Surge Protective Device (SPD) Manufacturer
JUTRION offers a comprehensive line of high-performance surge protective devices engineered to safeguard low-voltage power distribution, industrial automation, and renewable energy installations. Operating advanced production lines in our facility, we manufacture premium AC and DC SPDs certified to international standards. Whether you need robust Type 1+2 surge arresters for building main entries or specialized 1000V/1500V Y-topology Type 2 SPDs for Solar PV and Energy Storage Systems (ESS), JUTRION delivers uncompromising voltage spike protection to panel builders and EPC contractors in over 100 countries.
Fast Response
Engineered with premium MOVs, JUTRION SPDs respond within nanoseconds to clamp destructive overvoltages and prevent critical equipment downtime.
Modular Design
The DIN-rail plug-in structure allows fast module replacement without disconnecting main wiring, drastically reducing maintenance costs and time.
AC/DC Compatibility
Perfectly optimized for standard AC power distribution, commercial networks, and high-voltage 1000V/1500V solar PV and energy storage systems worldwide.
The Basics of Surge Protective Devices (SPD)
A Surge Protective Device (SPD) operates as an instantaneous voltage-sensitive switch. It detects destructive high-voltage spikes and shunts the massive surge current to the ground within nanoseconds. This process safely clamps the residual voltage to protect critical low-voltage components, industrial controls, and solar PV installations from downtime.
JUTRION Surge Protective Devices (SPD) Series
High-performance AC and DC SPDs manufactured on advanced production lines. Engineered to international standards, ensuring ultimate equipment safety and power continuity for panel builders and EPC contractors worldwide.
JRSPD-40DC -II Series (Standard Type 2)
Engineered for standard distributed PV combiners and inverters. Features a reliable $8/20\ \mu\text{s}$ waveform protection profile up to DC 1500V.
JRSPD-40DC -I+II Series (Type 1+2 Combined)
High-performance heavy-duty protection capable of handling direct lightning strikes (10/350 us impulse current) in high-risk utility-scale ground stations.
JUSPD-40AC Series (Standard Type 2 / Class II)
Our flagship commercial and industrial AC surge protector. Featuring a maximum discharge current (Imax) of 40kA, this series is the global B2B industry standard for sub-panels, motor control centers (MCC), and automation enclosures. Available in 1P, 2P, 3P, and 4P configurations to seamlessly match TT, TN, and IT grounding networks.
JUSPD-12.5AC Series (Type 1+2 / Class I+II Combined)
A heavy-duty, dual-certified solution that eliminates the need for separate Type 1 and Type 2 installation. Featuring a robust 12.5kA impulse current (Iimp 10/350 us) to handle direct lightning strikes, it simultaneously maintains a low voltage protection level (Up) to safeguard downstream sub-panels. Perfect for building main service entries, reducing decoupling space and hardware costs for panel builders worldwide.
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SPD Selection Matrix: AC & Solar DC Systems
| System Type | SPD Category | Core Test Waveform | Key Parameters | Best Application Scenario |
| AC Power | Type 1 (Class I) | 10/350 us (Direct Lightning) | Iimp: 12.5kA / 25kA Up <= 2.5kV | Main Power Distribution Boards: Installed at the building main service entrance to withstand massive incoming direct lightning currents |
| AC Power | Type 2 (Class II) | 8/20 us (Indirect Lightning) | In: 20kA / Imax: 40kA Up <= 1.8kV | Sub-Panels & Control Cabinets: Perfect for downstream distribution loops and protecting JUSPD-40AC installations. |
| AC Power | Type 1+2 (Combined) | Dual Test: 10/350 μs & 8/20 μs | Iimp: 12.5kA Up <= 1.5kV (Low Residual) | Heavy-Duty Compact Protection: Direct lightning defense + fine equipment protection in one single module. Saves space and decoupling costs. |
| Solar DC | Type 2 (Class II) | 8/20 us (Indirect Lightning) | In: 20kA / Imax: 40kA Uc: DC 1000V / 1500V | PV Combiners & Inverters: Specialized for solar arrays and energy storage systems (ESS) to handle DC voltage fluctuations. Fits JRSPD-40DC series. |
Precision and Reliability: The JUTRION Surge Protective Device Production Process
With over a decade of low-voltage industry expertise and 10+ modern production lines in Wenzhou, JUTRION ensures rigorous quality control and fast lead times for every single AC and DC surge protector we ship.
Sourcing Surge Protective Devices: What Global Buyers Need to Evaluate
Choose the Right SPD Category Based on Application Scenarios
- Main AC Service Entrance (Direct Lightning Risk): Install a Type 1 (Class I) SPD to handle direct lightning strikes (10/350 us waveform). If panel space is tight, upgrade to a Type 1+2 Combined SPD to eliminate separate secondary units and cut decoupling line costs.
- Sub-Panels & Factory Cabinets (Grid Surges): Install a Type 2 (Class II) SPD (8/20 us waveform) to block indirect lightning and switching spikes. This is the industrial standard for standard distribution loops, perfectly covered by our flagship JUSPD-40AC series.
- Solar PV Arrays & Storage (High-Voltage DC): For solar combiners, inverters, and energy storage systems (ESS), utilize specialized Solar DC Type 2 SPDs rated up to DC 1000V/1500V (such as our JRSPD-40DC series) to manage continuous DC voltage fluctuations.
Choose the Right SPD Based on Test Waveforms
Surge protective devices are engineered and tested under different lightning simulation currents. Selecting the right waveform ensures your equipment can withstand the actual energy surge:
- 10/350 us Waveform (Direct Strike Protection): This waveform represents a fast rise time with a long, high-energy decay, simulating a direct lightning strike. It delivers massive kinetic energy, meaning you must choose a Type 1 or Type 1+2 Combined SPD for main entrance panels to survive this impact.
- 8/20 us Waveform (Indirect Strike Protection): This waveform features a shorter duration and lower energy profile, simulating indirect lightning induction or internal grid switching spikes. For standard downstream protection in sub-panels, an 8/20 us rated Type 2 SPD (such as our JUSPD-40AC or JRSPD-40DC series) provides the optimal, cost-effective defense.
Match Key Electrical Parameters (Uc, In, Imax, Up)
- Uc (Max Continuous Operating Voltage): Must be higher than your nominal system voltage. For instance, standard low-voltage AC panels require AC 275V/385V, while solar tracks need DC 1000V or 1500V.
- In / Imax (Discharge Capacity): Look for a balanced rating. For general industrial sub-panels, a 40kA maximum discharge current (Imax) under an 8/20 us wave—like our flagship JUSPD-40AC—is the standard benchmark.
- Up (Voltage Protection Level): This defines the residual voltage left after a surge. A lower Up provides tighter, safer protection for downstream electronics like PLCs.
Evaluate Manufacturing Scale and Certifications
- Standards Compliance: For international bidding and grid acceptance, ensure the SPDs are certified to IEC 61643-11 (for AC power) or IEC 61643-31 (for Solar PV).
- Production Capability: Partnering directly with a factory that operates 10+ advanced manufacturing lines guarantees optimal EXW pricing, robust batch-to-batch quality control, and reliable lead times for large B2B orders.
Core Application Scenarios of SPDs
Solar + Storage Systems
Industrial Automation & Manufacturing
Telecommunications & Data Center Systems
Smart Buildings & Commercial Property
JUTRION: YOUR PREMIUM SURGE PROTECTIVE DEVICE (SPD) MANUFACTURER
Frequently Asked Questions about SPDs
What is an SPD in an electrical system?
SPD stands for Surge Protective Device. It is an essential component designed to protect electrical installations, sensitive electronic equipment, and automated systems from transient overvoltages (surges).
How Does an SPD Work?
- Normal Conditions (High Impedance): Under standard operating voltage, the SPD maintains a high-impedance state, acting as an open circuit. It remains completely passive and does not affect the system’s performance.
- Surge Event (Low-Impedance State): When a transient overvoltage occurs due to lightning or switching operations, the SPD’s internal protective components, such as metal oxide varistors (MOVs), respond rapidly and switch to a low-impedance state. The surge current is then diverted through the protective bonding and earthing path, while the residual voltage is limited to the SPD’s voltage protection level (Up), helping protect downstream equipment.
What is the difference between Type 1, Type 2, and Type 1+2 SPDs?
Type 1 SPDs handle heavy direct lightning (10/350
μs); Type 2 shields against induced and switching surges (8/20μs); while Type 1+2 combines both into a single unit to deliver ultimate heavy-duty protection with low residual voltage, eliminating the need for space-consuming decoupling.
How to Choose the Right SPD for Solar PV Systems?
DC Side (Solar Panels to Inverter)
- Must use a dedicated PV SPD (complying with IEC 61643-31). Ensure its maximum continuous operating voltage (Ucpv) is at least 1.2 times the maximum open-circuit voltage (Voc) of the solar string to handle continuous high DC voltage safely.
AC Side (Inverter to Grid)
- Select an SPD with a suitable Uc rating for the system voltage, such as 230/400 V AC. Use a Type 1 or Type 1+2 SPD at the service entrance where lightning current protection is required, and use a Type 2 SPD on the AC side of the inverter for protection against induced lightning and switching surges.
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