Power Distribution Surge Protection
Power distribution systems are the core electrical infrastructure in buildings, factories, commercial facilities and industrial sites. Surges may enter through incoming power lines, switching operations, inductive loads or nearby lightning activity. Without proper protection, electrical equipment may suffer insulation breakdown, control failure or unexpected shutdown. A layered surge protection design is recommended for low-voltage distribution systems, including main distribution protection, sub-distribution protection and terminal equipment protection.
Low-voltage main switchgear incoming feeder
Tiered protection for the main cabinet, suitable for 220/380V TN-S systems.
AC Power SPD->Type 1 / Class l
Uc:
AC385V/420V/440V
Iimp (10/350 μs):
25kA
In (8/20 μs):
60kA
Imax(8/20 μs):
100kA
Mode of Protection:
L/N-PE; L-N, N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingDistribution cabinet / Feeder cabinet
Secondary protection to limit residual voltage downstream of the main cabinet.
AC Power SPD->Type 2 / Class ll
Uc:
AC385V/420V/440V
In (8/20 μs):
60kA
Imax(8/20 μs):
100kA
Mode of Protection:
L/N-PE; L-N, N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingTerminal distribution box / Equipment cabinet
Fine-level protection at the load end to safeguard pumps, fans, and control power supplies.
AC Power SPD->Type 2 / Class ll
Uc:
AC385V/420V/440V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Mode of Protection:
L/N-PE; L-N, N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingWater pump / Building control signal cables
Protection for 24V control, telemetry, and remote control signals.
Signal & Data SPD
Uc(V) :
15V/30V/60V
Un(V) :
12V/24V/48V
In (8/20 μs):
5kA
Imax(8/20 μs):
10kA
Reference Standards:
IEC 61643-21OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingSolutions
Different systems require different SPD types, voltage levels, wiring structures and installation positions. Select your application scenario to view the recommended protection strategy.FAQ
Can CRESIN provide SPD for industrial distribution panels?
Yes. CRESIN can provide AC SPD products for main distribution panels, sub-panels, control cabinets, industrial machinery, and building electrical systems.
Is grounding necessary for distribution SPD?
Yes. A reliable grounding system is necessary for SPD to safely discharge surge energy and provide effective protection.
How do I choose SPD for a distribution cabinet?
You need to confirm the system voltage, grounding system, number of phases, installation position, required discharge current, and protection level.
What is coordinated surge protection?
Coordinated surge protection means using different SPD levels at different installation points, such as Type 1 at the main incoming side, Type 2 at sub-distribution boards, and then step-by-step coordination enables the gradual release of electrical energy.
Where should SPD be installed in a distribution system?
SPD is commonly installed at the main distribution board, sub-distribution board, control cabinet, machinery panel, and near sensitive electrical equipment.
Why do power distribution systems need surge protection?
Power distribution systems can be affected by lightning surges, switching operations, grid disturbances, and transient overvoltage. SPD helps protect downstream electrical equipment and reduce failure risk.
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The product range includes production technologies for smart capacitors, digital display meters, surge protectors, dedicated backup protection devices for surge protectors, self-resetting over/under-voltage protectors, control and protection switches, and automatic transfer switches for dual power supplies.
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