ODM SJKS1-C Series Surge Protection Device SPD 3/4P 25kA Suppliers, Company

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ODM SJKS1-C Series Surge Protection Device SPD 3/4P 25kA Suppliers, Company

The SJKS1-C series surge protective device (SPD) offers rapid <25ns response to suppress transient overvoltages from lightning and switching operations. Available in 5kA and 10kA nominal discharge current variants with maximum capacities up to 20kA, it features built-in thermal cut-off protection and a visual status indicator. Supporting AC 420V systems, this modular SPD suits building distribution panels, industrial controls, and communication equipment. Its pluggable design enables easy online replacement, while the optional N-PE spark gap ensures comprehensive protection. Operating reliably from -40°C to +85°C, it delivers essential overvoltage safety for low-voltage power networks.

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Product Description

Type Designation

Index	Designation Meaning
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

SJKS1-C 2P Surge Protection Device overlook

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 Imax (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 (°C)	-40°C~+85°C
Relative humidity (25°C)	≤95%
Installation	Standard 35mm rail
Housing material	Glass-reinforced plastic

Outline Dimensions and Installation Size

Frequently Asked Questions

What does the status indicator mean on the SPD?

The status indicator provides visual monitoring for device reliability. A green window indicates the surge protector is functioning normally, while a red window indicates a fault or expiration, signaling that the module must be replaced immediately.

What is the main difference between SJKS1-C-10 and SJKS1-C-20?

The key differences are the discharge capacities and protection levels: SJKS1-C-10 has a nominal discharge current (In) of 5kA and maximum (Imax) of 10kA with Up ≤1.0kV; SJKS1-C-20 features a nominal discharge current (In) of 10kA and maximum (Imax) of 20kA with Up ≤1.2kV.

How is this Surge Protective Device installed?

The SPD is designed for standard 35mm DIN-rail mounting. Its modular structure facilitates quick snapped installation and enables hot-swap online replacement without interrupting line power.

What backup protection is required for this SPD?

It is recommended to connect a 32A fuse or miniature circuit breaker (MCB) upstream in series with the SPD to ensure circuit protection against sustained short circuits.

How quickly does the surge protective device react to transient overvoltage?

The SPD delivers an ultra-fast response time of less than 25 nanoseconds (<25ns), instantaneously diverting damaging voltage spikes safely to the ground.

ODM SJKS1-C Series Surge Protection Device SPD 3/4P 25kA Suppliers, Company

Product Description

Type Designation

Product Features

Core Functions

Product Display

Technical Parameters

Outline Dimensions and Installation Size

Frequently Asked Questions

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