Claire
Mr.Fu
Claire
Surge Protection Device SPD SJKS1-C Series 3/4P 25kA - Reliable China Suppliers & Factory for Overvoltage Safety
Type Designation
| 1 | Surge Protective Device |
| 2 | C-level Protection |
| 3 | Maximum Discharge Current Imax (kA) |
| 4 | Number Of Poles: 1P, 2P, 3P, 4P, N+PE |
| 5 | Maximum Continuous Operating Voltage Uc (V) |
Product Features
- Built-in overcurrent, overheat, and thermal cut-off protection technology.
- Modular design for easy installation and online replacement.
- Low leakage current, fast response time, and low residual voltage.
- Status indicator: Green (normal), Red (fault).
- High-energy N-PE spark gap electrode manufactured with advanced technology.
Core Functions
Surge Protective Device (SPD), also known as lightning arrester, is mainly used to suppress transient overvoltage on circuits, discharge lightning induced surges and switching overcurrent, so as to protect downstream electrical and electronic equipment from breakdown and damage caused by instantaneous high voltage.
- 1 Lightning surge protection: Instantaneous high voltage of tens of thousands of volts generated by direct or induced lightning strikes will be quickly conducted by SPD to divert lightning current to the ground.
- 2 Suppression of switching overvoltage: Eliminate switching surges generated by contactors, frequency converters, motor start-stop and capacitor switching.
- 3 Equipotential protection: Clamp the potential of equipment enclosures and circuits to a safe level to eliminate potential difference.
- 4 Insulation protection: Maintain high insulation under normal operating conditions without interfering with power supply, and instantly conduct to discharge surge current when surges occur.
Product Display
Technical Parameters
| Parameter | SJKS1-C-10 | SJKS1-C-20 |
| Maximum continuous operating voltage Uc (V~) | 420V | |
| Voltage Protection Level Up (kv) | ≤1.0 | ≤1.2 |
| Nominal discharge current In (8/20μs) kA | 5kA | 10kA |
| Maximum discharge current lmax (8/20μs) kA | 10kA | 20kA |
| Response Time (ns) | <25 | |
| Conductor cross-section L/N | 10, 16mm² | |
| Grounding conductor cross-section PE | 10, 25mm² | |
| Fuse or Circuit Breaker Selection (A) | 32A | |
| Operating temperature (℃) | -40℃~+85℃ | |
| Relative humidity (25℃) | ≤95% | |
| Installation | Standard 35mm rail | |
| Housing material | Glass-reinforced plastic | |
Outline Dimensions and Installation Size
Frequently Asked Questions
What is the main function of the SJKS1-C Surge Protective Device?
The SJKS1-C SPD is designed to suppress transient overvoltage in electrical circuits. It discharges lightning-induced surges and switching overcurrents to protect downstream electrical and electronic equipment from high voltage damage.
How do the visual status indicators work?
The device features color-coded status windows. Green indicates the device is operating normally, while Red indicates a fault state, meaning the module has reached its end of life and needs to be replaced.
What is the difference between SJKS1-C-10 and SJKS1-C-20?
The primary difference lies in their discharge current ratings. The SJKS1-C-10 has a nominal discharge current (In) of 5kA and a maximum discharge current (Imax) of 10kA. The SJKS1-C-20 has a nominal discharge current (In) of 10kA and a maximum discharge current (Imax) of 20kA.
Is the SJKS1-C Surge Protective Device easy to install?
Yes. It features a modular design that mounts onto standard 35mm DIN rails, which makes initial installation and online replacement quick and simple.
What is the response time of this SPD?
The SJKS1-C series has a very fast response time of less than 25 nanoseconds (<25ns), ensuring quick response to suppress sudden voltage spikes.