Dispositivo de protección contra sobretensiones Chint NU6-II G40/440-3P/20KA (SPD)

Chint NU6-II G40/440-3P/20KA is a Class II Test Surge Protective Device (SPD) primarily designed for lightning protection and transient overvoltage protection in three-phase power distribution systems. It features a maximum discharge current of 40kA, a nominal discharge current of 20kA, a continuous operating voltage of 440V, a 3-pole configuration, and a voltage protection level of 2.0kV. This device complies with the standards of GB/T 18802.11 y CEI 61643-11, and has obtained certifications such as CQC and CE.

Especificaciones principales

Funciones y aplicaciones

Funciones centrales: Discharges transient energy such as lightning strikes and operational overvoltages, suppresses overvoltages, and protects downstream power distribution equipment and loads from damage caused by electrical surges.

Aplicaciones típicas: Lightning protection at the power supply input of three-phase power distribution incoming cabinets, floor distribution boxes, UPS front ends, frequency converters/servo drives, and other industrial control equipment. It can be used in combination with upstream Class I SPDs and downstream Class III SPDs to establish a cascaded protection system.

Selection and Installation Guidelines

1. Escenarios de aplicación: Suitable for three-phase 380V power distribution systems, especially occasions with significant line voltage fluctuations and a demand for higher Uc, such as industrial power grids and outdoor distribution boxes.
2. Backup Protection: It is recommended to equip with a Type C or Type D circuit breaker/fuse rated at 16-25A to prevent short circuits caused by SPD failures.
3. Wiring Requirements: The cross-sectional area of connecting wires should be ≤16mm². The length of phase wires and ground wires should be as short as possible (≤0.5m) to reduce the impact of line impedance on protection performance.
4. Método de montaje: 35mm standard DIN rail mounting, occupying 3 modular positions (approximately 54mm in width).

Price Reference and Procurement Tips

The retail price is approximately 180-280 RMB por unidad (as of December 2025, excluding tax and installation costs). Para compras al por mayor (≥10 units), the price can drop to 150-220 RMB por unidad. Models with remote alarm (Type F) have a price increase of 10-15%.

Procurement Channels: Chint Electric Mall and authorized distributors. It is crucial to verify the model suffix and certification marks to avoid non-standard or refurbished products.

Recommendations for Surge Protective Devices Similar to Chint NU6-II G40/440-3P/20KA

1. Recommendations for International Brands
2. Schneider Electric

iPRU SS Series: A9LM20403 (SS iPRU 40r 3P)

Specifications: In=20kA, Imax=40kA, Uc=350V, 3PAG, Voltage Protection Level ≤2.0kV

Características: Intelligent design, fault indication, and remote monitoring capabilities

Referencia de precio: Aproximadamente 280-380 RMB por unidad

IST Series: IST 40 3PAG

Specifications: In=20kA, Imax=40kA, Uc=340V, 3PAG

Características: Fixed design, compact size, ideal for space-constrained environments

Referencia de precio: Aproximadamente 250-350 RMB por unidad

2. TEJIDO

OVR T2 Series: 9AKK108466A4410 (OVR T2 3L 40-440 P TS QS)

Specifications: In=20kA, Imax=40kA, Uc=440V, 3PAG, Voltage Protection Level ≤1.8kV

Características: “TS” indicates with auxiliary contact; “QS” indicates pluggable for easy maintenance

Referencia de precio: Aproximadamente 300-400 RMB por unidad

3. Phoenix Contact

VAL-MS Series: 2817741 (VAL-MS 440/20/3+0)

Specifications: In=20kA, Imax=40kA, Uc=440V, 3PAG (no neutral line), Voltage Protection Level ≤2.2kV

Características: “Hot-swappable” modular design, enabling replacement without power cutoff, suitable for critical equipment

Referencia de precio: Aproximadamente 350-450 RMB por unidad

4. DEHN

DG M TNC Series: DG M TNC 440

Specifications: In=20kA, Uc=440V, 3PAG, Short-circuit Withstand Capacity 25kA

Características: Compact design with 3-module width, suitable for TNC systems

Referencia de precio: Aproximadamente 320-420 RMB por unidad

DEHNguard SE CI Series: DEHNguard SE CI 440

Specifications: In=20kA, Uc=440V, integrated backup fuse

Características: Integration of overvoltage protection and backup fuse, reducing installation space

Referencia de precio: Aproximadamente 380-480 RMB por unidad

5. OBO

V20 Series: V20-C/3-440V (Order No.: 5094710)

Specifications: In=20kA, Imax=40kA, Uc=440V, 3PAG

Características: Modular design with optional FS (remote signaling) function

Referencia de precio: Aproximadamente 300-400 RMB por unidad

1. Recommendations for Domestic Brands
2. DELIXI Electric

CDYN Series: CDYN-II 40kA 3P 440V YX

Specifications: In=20kA, Imax=40kA, Uc=440V, 3PAG, Voltage Protection Level ≤2.0kV

Características: “YX” indicates with remote signaling function for remote fault indication

Referencia de precio: Aproximadamente 160-260 RMB por unidad

DZ47sY Series: DZ47sY-II 20kA 3P 440V

Specifications: In=10kA, Imax=20kA, Uc=440V, 3PAG

Características: Terminal power distribution type, cost-effective, suitable for household and small-scale industrial applications

Referencia de precio: Aproximadamente 80-150 RMB por unidad

2. Zhongguang Lightning Protection

ZGZNSD Series: ZGZNSD20-F

Specifications: In=20kA, integrated monitoring module, supporting remote monitoring

Características: Intelligent design with lightning current and leakage current monitoring, suitable for critical systems

Referencia de precio: Aproximadamente 220-320 RMB por unidad

3. Other Models in Chint Series

NU6-II Series (Non-G Series)

NU6-II 40kA/440V 3P: Same specifications, the absence of “G” indicates no remote alarm

Referencia de precio: Aproximadamente 180-280 RMB por unidad

NXU-II Series (Kunlun Series)

NXU-II G 40kA/440V 3P: Similar positioning and performance to the NU6-II G Series

Referencia de precio: Aproximadamente 170-270 RMB por unidad

III. Comparison Table of Product Specifications

Nota: Some parameters are estimated values; refer to official manuals for actual specifications.

1. Selection Suggestions
2. Selection Based on Budget

Economical (<200 RMB): DELIXI DZ47sY-II Series, Standard Chint Models

Cost-Effective (200-300 RMB): Chint G Series, DELIXI CDYN Series, Schneider IST Series

High-End (>300 RMB): International Brands such as ABB, Phoenix Contact, and DEHN

2. Selection Based on Functional Requirements

Remote Monitoring Needed: Choose models with suffixes like “F”/”YX”/”FS” (p.ej., NU6-II G40/440-3P/20KA-F)

Frequent Maintenance Needed: Choose models with “QS” (pluggable) function (p.ej., ABB OVR T2 Series)

Space Constraints: Consider compact designs (p.ej., DEHN DG M Series, only 3-module width)

3. Compatibility Considerations

Backup Protection: All recommended products should be equipped with Type C or Type D circuit breakers/fuses rated at 16-25A

System Compatibility: Confirm compatibility with your power distribution system type (TN-S/TN-C/TT)

Método de montaje: All products support 35mm standard DIN rail mountin。

1. Summary of Recommendations
2. Best Cost-Effectiveness: Chint NU6-II Series (same-brand alternative) or DELIXI CDYN Series (equivalent performance at a lower price)
3. First Choice for High-End Quality: ABB OVR T2 Series (slightly better protection level) or Phoenix Contact VAL-MS Series (convenient maintenance)
4. Special Requirements:

Remote Monitoring: Schneider iPRU Series or models with “F” suffix

Wind Power/Photovoltaic Systems: DEHN DG M TNC 440 or OBO V20 Series

It is advisable to make a selection based on the actual application scenario, budget, and maintenance requirements, and purchase through official channels to ensure product quality and after-sales service. For more accurate selection, you can provide specific parameters of your power distribution system and protection requirements for further analysis.