Industrial Automation Surge Protection
Industrial automation systems use PLCs, sensors, actuators, control panels, communication modules and power supplies. These devices are sensitive to transient overvoltage caused by lightning, switching operations, motor starting, relay operation and inductive load interference. Surge protection should be considered for power supply circuits, signal circuits, communication lines and control cabinets.
Main power distribution cabinet incoming line terminal
Photovoltaic DC-side Type 2 (T2) SPD; select DC 600/1000/1200/1500 V based on system voltage.
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 SignalingPLC/control cabinet power supply input
Suppresses DC surges between the PV modules and the inverter.
DC Power SPD
Un(V):
DC12/24/48/120/220/380/750/1000
Uc(V):
DC15/30/60/175/275/505/1060/1200
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 Signaling
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 SignalingVFD/MCC cabinet incoming line
AC secondary protection; protects low-voltage equipment on the grid-connection side.
AC Power SPD->Type 2 / Class ll
Uc:
AC385V/420V/440V
In (8/20 μs):
30kA
Imax(8/20 μs):
60kA
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 SignalingField sensor/actuator signal cables
AC primary protection; located at the boundary between LPZ 0B and LPZ 1.
DC Power SPD
Un(V):
DC12/24/48/120/220/380/750/1000
Uc(V):
DC15/30/60/175/275/505/1060/1200
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 SignalingIndustrial switch/remote I/O network port
Provides protection for Ethernet and 24V/analog signal lines, respectively.
Signal & Data SPD
Uc(V) :
8V
Un(V) :
5V
In (8/20 μs):
10kA
Imax(8/20 μs):
20kA
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
What information is needed for automation SPD selection?
You need to provide power voltage, signal type, communication protocol, cable length, installation environment, grounding condition, and protected equipment type.
Where should SPD be installed in industrial control systems?
SPD should be installed at power input points, cabinet cable entry points, communication interfaces, sensor line entrances, and near sensitive control equipment.
What type of SPD is used for RS485 communication?
RS485 systems require signal SPD designed for low-voltage communication lines. The SPD should match the working voltage, number of wires, transmission speed, and communication structure.
Can surge protection protect PLC systems?
Yes. Properly selected SPD can help protect PLC power supplies, communication modules, I/O modules, and connected field devices from surge damage.
What parts of an automation system need SPD?
SPD may be needed for AC power supply lines, DC power circuits, PLC input/output lines, RS485 communication lines, sensor lines, Ethernet networks, and control cabinets.
Why do industrial automation systems need surge protection?
Industrial automation systems include PLCs, sensors, control cabinets, communication networks, and power supplies. These components are sensitive to transient overvoltage caused by switching operations, lightning-induced surges, and electrical interference.
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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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