SJKS1-B Series Surge Protection Device 80KV 385V

The SJKS1-B series surge protective device (SPD) is a voltage-limiting type designed for indoor fixed installation, offering rapid <25ns response to suppress transient overvoltages from lightning and switching operations. Available in 40kA and 60kA nominal discharge current variants with up to 100kA maximum capacity, it features a built-in thermal disconnector that automatically isolates faulty modules and a visual window indicating green for normal operation and red for failure. Supporting AC 385–440V systems, the SPD suits building distribution, PV inverters, industrial controls, and communication equipment. Its pluggable modular design, optional remote alarm, and wide -40°C to +85°C operating range ensure reliable, maintenance-friendly overvoltage protection across diverse applications.

product details

Type Designation

1	Surge Protective Device
2	B-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

- The SPD is single-port type with electric shock protection, designed for indoor fixed installation, and belongs to voltage-limiting type.
- Built-in disconnector inside the SPD. When the SPD fails due to overheating or breakdown, the disconnector can automatically disconnect it from the power grid and send an indication signal simultaneously.
- The visual window shows green during normal operation of the SPD, and turns red after failure and disconnection.
- Adopts high-quality imported chips with large discharge current capacity.

Applicable Scenarios

1. Main power distribution cabinets and floor distribution boxes of buildings
2. Photovoltaic inverters and energy storage DC combiner boxes
3. Weak current circuits for surveillance cameras, switches and access control systems
4. Frequency converters, PLCs and precision industrial control instruments
5. Outdoor base stations, charging piles and communication cabinets

product Display

SJKS1-B Surge Protection Device overlook

Technical Parameters

Parameter	SJKS1-80 (40kA)	SJKS1-80 (60kA)
Maximum Continuous Operating Voltage Uc (V~)	385/420/440
Voltage Protection Level Up (kV)	≤2.5	≤2.6
Nominal Discharge Current In (8/20μs) (kA)	40kA	60kA
Maximum Discharge Current Imax (8/20μs) (kA)	80kA	100kA
Response Time (ns)	<25
Cross-section of L/N Connecting Wire (mm²)	10, 16	10, 16
Cross-section of PE Earth Wire (mm²)	25	25, 35
Fuse or Circuit Breaker Rating (A)	63A	63A
Operating Ambient Temperature (℃)	-40 ~ +85
Relative Humidity (at 25℃)	≤95%
Mounting	35mm Standard DIN Rail
Housing Material	Glass-fiber Reinforced Plastic