SKD1 Surge Protection Device(SPD)

Type Designation
SK	D	1	B	80	/4P	/420
Company Code	Miniature Circuit Breaker	Serial Code	Code for Lightning Protection Level	Maximum Discharge Currents(k A)	No of Poles	Maximal Consistent Operational Current
	Surge Protective Device（SPD）	1：Type1 Case，Maximum Discharge Currents: 10kA-80kA	B: Class B Lightening Protection C: Class B Lightening Protection D: Class D Lightening Protection Null Code: Class B	D1-Type: 10,20,30,40,60,80 D2-Type: 60,80,100 D3-Type: 100,120,150 D3-I Type: 15,25,50	1: 1 pole 2: 2 poles 3: 3 poles 4: 4 poles	420V （Optional Noted）
		2：Type2 Case,Maximum Discharge Currents: 60kA-100kA
		2：Type3 Case,Maximum Discharge Currents: 100kA-150kA

  Category  

- Classification according to the maximum discharge current (KA)

Type 1 frame: Divided into six grades, namely D10, D20, C30, C40, B60, and B80.

Type 2 frame: Divided into three grades, namely 60, 80, and 100.

Type 3 frame: Divided into three grades, namely 100, 120, and 150.

-Classification according to the lightning protection level

Level B: Lightning protectors that can directly withstand the energy of direct lightning strikes and release part of the direct lightning strike current (corresponding to test category Level I). It is divided into Type 1 frame B60, B80 and eight grades of Type 2 frame in total.

Level C: Lightning protectors that can release the energy of long-distance or conducted lightning strikes and release part of the direct lightning strikes (corresponding to test category: Level II). It is divided into two grades of Type 1 frame, C30 and C40.

Level D: Precision lightning protectors designed to protect terminal loads (corresponding to test category: Level III). It is divided into two grades of Type 1 frame, D10 and D20.

  Features  

- High-quality imported chips with large current-carrying capacity. - One-port design for protection against electric shock. - Equipped with a built-in disconnector. When the SPD fails due to overheating or breakdown, the disconnector can automatically disconnect it from the power grid and provide an indication signal at the same time.

- Hot-swappable design allows for the replacement of the protector unit without power outage.

- The response time of operation is less than 25 nanoseconds.

  Application Scenarios  

Civil        Commercial                    Industrial

  Operational Conditions & Installation  

Operating Conditions

-Operating Temperature: -20℃ to +45℃, with an average value within 24 hours not exceeding +35℃.

-Operating Humidity: Under the condition of +40℃, the average humidity should not exceed 50%, and there should be no condensation.

-Altitude: It should be less than 2000 meters. If it exceeds 2000 meters, the rated value should be reduced for use.

-Vibration and Gas: The operating environment should be free from strong vibrations and impacts, and there should be no harmful gases that can corrode metals or damage insulation.

-Surrounding Substances: There should be no serious dust, conductive particles, or explosive hazardous substances.

Pollution Degree: Level Ⅲ.

Installation Method

-IP Rating: P20.

-Installation Method: Use the TH35 - 7.5 standard guide rail and install it vertically.

-Inlet Wiring Method: The incoming wires are from the top, and the outgoing wires are from the bottom.

  SKD 1 Type Surge Protection Device Description  

The SKD1 type surge protector adopts a modular design and is suitable for AC 50/60Hz power supply systems with rated voltages up to 420V, including TN-S, TN-C-S, TT, and IT systems. It protects against surges caused by indirect lightning strikes and direct lightning strikes or other transient overvoltages. It can serve as an equipotential bonding point at the interface between LPZ1, LPZ2, and LPZ3 zones.

  Product Applications and Installation Locations  

- SKD1 - B Surge Protector

The SKD1 - B type surge protector is suitable for Class B lightning protection. It is used for equipotential bonding during lightning strikes. It should be installed in the LPZOA area or at the junction of the LPZOB area and the LPZ1 area. Usually, it is installed at the low - voltage main distribution cabinet for buried conduit - entry incoming lines.

- SKD1 - C Surge Protector

The SKD1 - C type surge protector is suitable for Class C lightning protection. It is used for equipotential bonding during lightning strikes. It is installed in the LPZOB area or at the junction of the LPZOB area and the LPZ2 area. Typically, it is installed in floor distribution boxes, computer centers, telecommunication rooms, elevator control rooms, frequency - conversion equipment control rooms, hospital operating rooms, intensive care units, and distribution boxes in places equipped with electronic medical devices. For scattered small villas, the SPD should be installed in the household distribution boxes.

- SKD1 - D Surge Protector

The SKD1 - D type surge protector is suitable for Class D lightning protection. It is installed at the junction of the LPZ1, LPZ2, and LPZ3 areas. Usually, it is installed in household distribution boxes, in front of computer centers, information equipment, electronic equipment, and control equipment, or in the nearest socket boxes.

  Technical Parameters  

Model	Maximum Continuous Operating Voltage	Voltage Protection Level	Nominal Discharge Current	Maximum Discharge Current	Response Time	Test Basis
SKD1 - D10	420	≤0.7	5KA	10KA	<25	GB18802、IEC61643 - 1
SKD1 - D20	420	≤1.0	10KA	20KA	<25	GB18802、IEC61643 - 1
SKD1 - C30	255	≤1.2	16KA	30KA	<25	GB18802、IEC61643 - 1
SKD1 - C40	420	≤1.5	20KA	40KA	<25	GB18802、IEC61643 - 1
N - PE		≤1.5/<1.8	limp:	12.5KA
SKD1 - B60		≤1.8/<2.0	30KA	60KA
SKD1 - B80		≤2.2 ≤2.4	40KA	80KA

Model	Cross - sectional Area of Connected Conductor	Cross - sectional Area of Connected Grounding Wire	Selection of Fuse or Circuit Breaker	Lightning Protection Level
SKD1 - D10	6mm²	10mm²	10A、16A	D
SKD1 - D20	10、16mm²	10、25mm²	16A、25A	D
SKD1 - C30			32A	C
SKD1 - C40	10、16mm²	25mm²		C
N - PE
SKD1 - B60				B
SKD1 - B80			63A	B

  Electric Parameter Table  

  Schematic Diagram of Wiring Method  

  Schematic Diagram of the Division of Lightning Protection Zones in Buildings  

Notes

LPZOA Zone: In this zone, all objects may be struck by lightning, and the entire lightning current can flow through them. There is no attenuation of the electromagnetic field.

LPZOB Zone: In this zone, within the range corresponding to the selected lightning protection rolling sphere radius, objects are less likely to be directly struck by lightning. There is no attenuation of the electromagnetic field.

LPZ1 Zone:  In this zone, objects cannot be directly struck by lightning. The lightning current flowing through each conductor is smaller than that in the LPZOB zone. The intensity of the electromagnetic field is attenuated, and the degree of attenuation depends on the shielding measures of large and small buildings. Doors, windows, etc. are "holes" for introducing LEMP (Lightning Electromagnetic Pulse).

LPZ2 Zone:  When it is necessary to further reduce the incoming lightning current and the intensity of the electromagnetic field, subsequent lightning protection zones should be added, such as shielded machine rooms, metal casings of equipment, chassis, cabinets, etc. The conditions for this lightning protection zone should be selected according to the environmental requirements of the protected objects.

  FAQ  

Q 1: Surge Protector Selection

Q: How can I select an appropriate SKD1 surge protector?

A: Select it according to the required lightning protection level and the environment. For example, choose SKD1 - B for Class B lightning protection, which is used at the junction of LPZOB and LPZ1, etc.; choose SKD1 - C for Class C lightning protection, which is suitable for places like computer centers; choose SKD1 - D for Class D lightning protection, which is used to protect terminal loads. Also, refer to parameters such as the maximum continuous operating voltage.

Q 2: Installation Conditions

Q: What are the key installation conditions for SKD series surge protectors?

A: The operating temperature should be between -20℃ and +45℃, and the 24-hour average should not exceed +35℃. The humidity at +40℃ should not exceed 50% and there should be no condensation. The altitude should be lower than 2000 meters. The environment should be free from strong vibrations, impacts, corrosive gases, and hazardous substances, and the pollution degree should be at Level Ⅲ.

Q 3: Importance of Technical Parameters

Q: Why are technical parameters such as the voltage protection level and discharge current of SKD1 surge protectors important?

A: The voltage protection level limits the over voltage. A lower value indicates better protection. The discharge current (nominal and maximum) reflects the ability to deal with surge currents. A higher value means it can handle strong lightning-induced surges and effectively protect the electrical system.