FAQ
Is Type 2 SPD suitable for most commercial and industrial projects?
Yes. Type 2 SPD is widely used in factories, buildings, electrical panels, machinery, automation systems, power distribution cabinets, and commercial facilities where induced surges are the main risk.
What parameters should I check for a Type 2 SPD?
Important parameters include Uc, In, Imax, Up, pole configuration, system type, backup fuse requirement, and response time. The correct selection depends on the power system and installation environment.
What is the difference between Type 1 and Type 2 SPD?
Type 1 SPD is designed to discharge direct lightning current with a 10/350 μs waveform, while Type 2 SPD is designed to discharge induced surge current with an 8/20 μs waveform. Type 1 is used at the main entrance, while Type 2 is used in distribution panels.
Where should a Type 2 SPD be installed?
Type 2 SPDs are typically installed in sub-distribution boards, control panels, power distribution cabinets, and downstream electrical panels. They are often installed after the main incoming protection device.
What is a Type 2 / Class II SPD?
A Type 2 / Class II SPD is used to protect electrical systems from induced surge voltages and switching overvoltage. It is the most commonly used SPD type in low-voltage power distribution systems.
Where is Type 1 SPD commonly used?
Type 1 SPDs are commonly used in main distribution boards, industrial plants, solar PV systems, wind power systems, telecom stations, commercial buildings, and facilities with external lightning protection systems.
Can Type 1 SPD replace Type 2 SPD?
Not always. Type 1 SPD is mainly used for high-energy lightning current discharge, while Type 2 SPD provides further voltage limitation in downstream distribution panels. In many systems, Type 1 and Type 2 SPDs are used together for coordinated protection.
What is the key parameter of a Type 1 SPD?
The key parameter of a Type 1 SPD is Iimp, which represents the impulse current discharge capability under a 10/350 μs waveform. This value indicates how much lightning current the SPD can safely discharge.
When should I use a Type 1 SPD?
You should use a Type 1 SPD when the building has an external lightning protection system, overhead power lines, high lightning exposure, or when the installation is located in an industrial, photovoltaic, wind power, or critical infrastructure environment.
What is a Type 1 / Class I SPD?
A Type 1 / Class I SPD is designed to discharge high-energy lightning current and is usually installed at the main power entrance of a building or electrical system. It is suitable for locations with direct lightning strike risk or external lightning protection systems.
How often should AC SPD be inspected or replaced?
AC SPD should be inspected regularly, especially after thunderstorms or electrical faults. If the status indicator shows failure or the remote alarm indicates a fault, the SPD module should be replaced.
Can AC SPD protect equipment without proper grounding?
No. Proper grounding is essential for effective surge protection. Without a reliable grounding path, the SPD cannot safely discharge surge energy.
What does Imax or In mean in AC SPD?
In is the nominal discharge current that the SPD can repeatedly handle under standard test conditions. Imax is the maximum discharge current the SPD can withstand once under defined test conditions.
What pole configuration should I choose for AC SPD?
The pole configuration depends on the power system. Common options include 1P, 1P+N, 2P, 3P, 3P+N, and 4P. The selection should match the electrical system and grounding arrangement.
How do I choose between Type 1 and Type 2 AC SPD?
Type 1 SPD is recommended for the main incoming distribution side, especially where direct lightning risk exists. Type 2 SPD is commonly used in sub-distribution boards to protect downstream equipment from induced surges and switching overvoltage.
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