KSPD-4P-AC Three-Phase 4-Pole 385V AC Surge Protective Device

• The KSPD-4P-AC is a 4-pole (4P) surge protective device designed for three-phase AC electrical systems. The product is designed to limit and discharge transient overvoltages on power lines, helping protect electrical systems and connected equipment from lightning-induced surges and transient overvoltages.
• The device has a maximum continuous operating voltage (Uc) of 385V, a nominal discharge current (In) of 20kA, and a maximum discharge current (Imax) of 40kA with an 8/20µs current waveform. With a voltage protection level (Up) of ≤ 1.8kV and a fast response time of ≤ 25ns, the device can respond quickly when voltage surges occur in the electrical system.
• The KSPD-4P-AC features plug-in protection modules, consisting of a base and removable surge protection modules, making installation, inspection, and replacement easier. The status indicator window allows users to quickly check the condition of each module. When a module fails, a red indicator appears in the inspection window.
• The device uses zinc oxide varistors with high discharge current capacity, combined with a Thermo Dynamic Control monitoring and disconnection mechanism. This system not only monitors the temperature of the varistor but also evaluates the discharge current level. It helps bring the device into a safe state and disconnect it when an overload occurs or operating parameters exceed the permitted limits.
• With its multi-pole configuration, the KSPD-4P-AC is suitable for installation in main electrical panels, main distribution boards, and sub-distribution boards of three-phase electrical systems. It can be used in factories, buildings, offices, shopping malls, industrial electrical systems, and other facilities using three-phase power supplies that require additional protection against transient overvoltages.
• The device is also suitable for equipotential bonding between Lightning Protection Zones LPZ 1 and LPZ 2, helping protect electrical equipment in power distribution areas.

Specifications

• Model: KSPD-4P-AC
• Device Type: AC Surge Protective Device (SPD)
• Number of Poles: 4P
• Electrical System: Three-Phase AC
• Maximum Continuous Operating Voltage (Uc): 385V AC
• Discharge Current Waveform: 8/20µs
• Nominal Discharge Current (In): 20kA
• Maximum Discharge Current (Imax): 40kA
• Voltage Protection Level (Up): ≤ 1.8kV
• Response Time (tA): ≤ 25ns
• Maximum Backup Fuse Rating: 125A gL/gG
• Short-Circuit Withstand Capacity: 25kA / 50Hz
• Operating Temperature: -40°C to +80°C
• Minimum Conductor Cross-Section: 1.5mm²
• Maximum Conductor Cross-Section: 35mm² (Stranded Wire) / 25mm² (Flexible Wire)
• Degree of Protection: IP20
• Housing Material: Thermoplastic
• Flame Retardant Rating: UL 94 V-0
• Module Type: Plug-in/Removable Module
• Module Color: Gray
• Fault Status Indicator: Red Indicator in the Inspection Window
• Remote Signaling Contact: Supported, Not Included as Standard
• Remote Signaling Contact Rating: AC 250V/0.5A; AC 125V/3A
• Maximum Remote Signaling Terminal Wire Size: 1.5mm²
• Applications: Main Distribution Boards, Sub-Distribution Boards, and Equipotential Bonding Between LPZ 1 and LPZ 2

• Model: KSPD-4P-AC
• Device Type: AC Surge Protective Device (SPD)
• Number of Poles: 4P
• Electrical System: Three-Phase AC
• Maximum Continuous Operating Voltage (Uc): 385V AC
• Discharge Current Waveform: 8/20µs
• Nominal Discharge Current (In): 20kA
• Maximum Discharge Current (Imax): 40kA
• Voltage Protection Level (Up): ≤ 1.8kV
• Response Time (tA): ≤ 25ns
• Maximum Backup Fuse Rating: 125A gL/gG
• Short-Circuit Withstand Capacity: 25kA / 50Hz
• Operating Temperature: -40°C to +80°C
• Minimum Conductor Cross-Section: 1.5mm²
• Maximum Conductor Cross-Section: 35mm² (Stranded Wire) / 25mm² (Flexible Wire)
• Degree of Protection: IP20
• Housing Material: Thermoplastic
• Flame Retardant Rating: UL 94 V-0
• Module Type: Plug-in/Removable Module
• Module Color: Gray
• Fault Status Indicator: Red Indicator in the Inspection Window
• Remote Signaling Contact: Supported, Not Included as Standard
• Remote Signaling Contact Rating: AC 250V/0.5A; AC 125V/3A
• Maximum Remote Signaling Terminal Wire Size: 1.5mm²
• Applications: Main Distribution Boards, Sub-Distribution Boards, and Equipotential Bonding Between LPZ 1 and LPZ 2