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● The SPD is single-port, with electric shock protection, indoor fixed installation, and voltage limiting type.
● The SPD has a built-in disconnector. When the SPD fails due to overheating or breakdown, the disconnector will automatically disconnect it from the power grid and send an indication signal at the same time. The visible window shows white when the SPD is working normally, and red after failure and disconnection.
● 1P+N, 2P+N and 3P+N are composed of 1P, 2P, 3P SPD + NPE neutral-ground protection modules, which are applied to TT, TN-S and other power supply systems.
LYD3 Series Surge Protective Devices (hereinafter referred to as SPD) are suitable for power supply systems such as IT, TT, TN-C, TN-S and TN-C-S with AC 50/60Hz and rated voltage of 380V, protecting against surges caused by indirect and direct lightning effects or other transient overvoltages. These are Class I SPDs (Type B SPDs) in accordance with IEC61643-1:1998-02. The products comply with GB18802.1, IEC61643-1 and other relevant standards.
| Model & Specification | LYD3-15 | LYD3-40 | LYD3-65 | LYD3-80 | LYD3-100 | LYD3-120 | ||||||
| Maximum Continuous Operating Voltage Uc (VAC) | 420 | 275 | 420 | 275 | 420 | 275 | 420 | 275 | 420 | 275 | 420 | 275 |
| Voltage Protection Level Up (kV) ≤ | 1.2 | 1.0 | 1.8 | 1.5 | 2.5 | 1.5 | 2.5 | 1.8 | 2.8 | 2.0 | 3.0 | 2.0 |
| Maximum Discharge Current (8/20μs) Imax (kA) | 15 | 45 | 65 | 80 | 100 | 120 | ||||||
| Nominal Discharge Current (8/20μs) In (kA) | 5 | 15 | 30 | 40 | 50 | 60 | ||||||
| Response Time (ns) | <25 | |||||||||||
| Failure Indication | White for Normal, Red for Failure | |||||||||||
| Ambient Temperature | -40℃~+80℃ | |||||||||||
| Protection Class | IP20 | |||||||||||
| Application | Incoming Line Protection | |||||||||||
● Class B lightning current SPD, used for equipotential bonding during lightning strikes.
● Installation: At the junction of LPZ0A or LPZ0B and LPZ1 zones, mounted on a 35mm standard DIN rail, with 10~35mm² multi-strand copper flexible connecting wires.
● Usually installed at the incoming low-voltage main power distribution cabinet — overhead incoming line.
● Users can freely combine single-phase or three-phase surge protective devices according to their needs.
● Normally installed at the incoming low-voltage main power distribution cabinet; the grounding wire shall adopt bicolor multi-strand copper flexible wires of 16mm² or above.
● To prevent the failure of surge protective devices from affecting the safe operation of the power grid, a matching LYSCB backup protector must be connected in series at the front end of each pole of the SPD.
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