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CU-C AC Surge Protective Device

CU-II 40C-SPD-Stereoscopic

CU-II 40C-SPD-Side1

CU-II 40C-SPD-Side2

/CU-II 40C-SPD-Top

CU-II 40C-SPD-Stereoscopic

CU-II 40C-SPD-Side1

CU-II 40C-SPD-Side2

/CU-II 40C-SPD-Top

CU-C AC Surge Protective Device

The CHINT CU-C AC Surge Protective Device (SPD) provides reliable surge and lightning protection for low-voltage AC power systems. Built to IEC/EN 61643-11 standards, it suppresses transient overvoltages and dissipates surge energy to protect sensitive circuits and electrical equipment. Available in 1P+N and 3P+N configurations, the CU-C AC SPD features a 40 kA discharge capacity, fast response time, fault indication, and optional remote signaling — ensuring stable operation and easy maintenance in industrial and commercial power systems.

Product Information

Standard: IEC/EN 61643-11
Certification: CE, CB
SPD Type: Class II (T2 test level)
Application: Low-voltage AC power systems
Protection Mode: L–N, N–PE
Poles: 1P+N / 3P+N
Maximum Discharge Current (Imax, 8/20 μs): 40 kA (L–N) / 60 kA (N–PE)
Nominal Discharge Current (In, 8/20 μs): 20 kA (L–N) / 30 kA (N–PE)
Maximum Continuous Operating Voltage (Uc): 385 V AC (L–N) / 255 V AC (N–PE)
Voltage Protection Level (Up): ≤ 1.7 kV (L–N) / ≤ 1.2 kV (N–PE)
Residual Voltage at 5 kA (Ures): ≤ 1.35 kV (L–N) / ≤ 1.2 kV (N–PE)
Response Time (tA): ≤ 25 ns (L–N) / ≤ 100 ns (N–PE)
Fault Indication: Green (normal) / Red (replace)
Auxiliary Contact Indication: Normal = NC / Failure = NO
Auxiliary Contact Capacity: AC 125 V / 1 A, DC 30 V / 100 mA
Protection Degree: IP20
Flame Retardancy: UL 94 V-0
Operating Temperature: −45 °C to +85 °C
Relative Humidity: 5–95 % RH
Dimensions:
- 1P+N: 125 × 38 × 40 mm
- 3P+N: 125 × 76 × 40 mm
Installation: Plug-in module with anti-pull buckle; compatible with standard enclosures

Name

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CU-口C-AC-SPD-catalog.pdf

592.07KB

2025-06-13

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2412-CU-II 40C-SPD-Manual EN.pdf

599.86KB

2025-01-08

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2412-CU-II 40C-SPD-CB Certificate.pdf

912.95KB

2025-01-08

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2412-CU-II 40C-SPD-CE Certificate.pdf

2.04MB

2025-01-08

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2412-CU-II 40C-SPD-CE RoHS Declaration Certificate.pdf

550.28KB

2025-01-08

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2411-CU-C-SPD-REACH Declaration.pdf

414.83KB

2025-01-08

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CU-II 40C-SPD-Drawing-3D 1PN.stp

4.24MB

2025-01-08

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CU-II 40C-SPD-Drawing-3D 3PN.stp

4.02MB

2025-01-08

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FAQs

What is the main function of the CU-C AC SPD?

It protects low-voltage power systems from transient overvoltages and lightning surges, safely diverting surge energy to ground to prevent equipment damage.

What systems is this SPD designed for?

The CU-C AC SPD is suitable for AC 230/400 V low-voltage networks in industrial, commercial, and building power distribution applications.

What configurations are available?

It’s available in 1P+N and 3P+N models, both rated for 40 kA discharge capacity and compatible with modular DIN-rail installations.

How does the device indicate faults or failure?

Each module includes a color indicator (Green = Normal, Red = Replace) and optional remote signaling contacts for system monitoring.

How is it installed or maintained?

The plug-in module design allows quick replacement — simply insert the unit into the cabinet and press down, or pull the handle outward for removal, as shown on page 5 of the catalog.