LSP provides Type 1+2 AC surge protection devices designed for installation at the transition between LPZ 0A/0B and LPZ 1 in low-voltage power distribution systems, serving as combined surge protection at the service entrance.
These Type 1+2 SPDs are suitable for industrial power distribution systems, commercial buildings, critical infrastructure, and applications with high system continuity requirements, supporting system-level surge protection solutions at the service entrance.
The FLP12.5 / FLP7 combined SPD series is designed in accordance with IEC 61643-11 and features a pluggable, modular construction. A single device provides coordinated protection against direct lightning impulse currents (10/350 µs) as well as surge currents caused by lightning induction and switching operations (8/20 µs).
The products support TT, TN-S, and TN-C-S power supply systems. The design addresses long-term thermal stability, controlled surge energy dissipation, and structural integrity under high-energy impulse conditions, supporting continuous operation of Type 1+2 SPDs under specified conditions.
Type 1+2 / Class I+II
Combined lightning current protection
10/350 μs & 8/20 μs
TN / TT / IT systems
IEC / EN 61643-11
Standards compliance
Type 1+2 surge protection devices (SPDs) integrate the protection functions of both Type 1 and Type 2, providing coordinated defense against direct lightning impulse currents and switching surges at service entrances and main distribution boards.
The Type 1+2 SPDs are available with Iimp (10/350 µs) ratings of 12.5 kA and 7 kA, In 20 kA, and Imax 50 kA, allowing selection based on system lightning exposure and design requirements, suitable for residential, commercial, and industrial AC systems.
The primary functional components of Type 1+2 Surge Protection Devices (SPDs) include the MOV voltage-limiting element, GDT high-energy discharge path, reinforced conductors and structural support, and SPD status indication & remote monitoring module.
Type 1+2 surge protection devices (SPDs) are composite protection units compliant with IEC/EN 61643‑11. By integrating the features of both Type 1 and Type 2, they provide coordinated protection against lightning impulse currents at the service entrance and switching surges downstream.
Type 1+2 SPDs undergo standardized performance testing and modular assembly, effectively controlling the voltage protection level (Up) and serving as part of a system-level surge protection strategy.
The Type 1+2 SPDs absorb lightning impulse energy and suppress transient overvoltages caused by switching or induced events, providing coordinated protection for downstream equipment and supporting system-level surge management strategies.
Surge Handling – 10/350 µs and 8/20 µs Currents
System Positioning – Between Type 1 and Type 2
Type 1+2 AC surge protection devices provide coordinated Type 1 and Type 2 protection:
1. Selection and pre-matching of core components
2. Component soldering and interconnection
3. Integration of the surge indication and the remote monitoring module
4. Structural reinforcement and insulation assembly
5. Final consistency and functional testing
Handles lightning impulse current (Iimp) and rated/maximum discharge currents (In, Imax) to protect the service entrance and downstream circuits from high-energy surges.
SPD withstands maximum continuous voltage Uc, ensuring coordination with the distribution system and downstream SPDs.
| Parameter | Model | Significance | |
| FLP12.5-275 | FLP7-275 | ||
| Iimp (10/350 µs) | 12.5 kA | 7 kA | Capacity to handle lightning impulse energy |
| In (8/20 µs) | 20 kA | 20 kA | Nominal SPD discharge capability |
| Imax (8/20 µs) | 50 kA | 50 kA | Maximum energy SPD can safely discharge |
| Up | 1.5 kV | 1.5 kV | Limits residual voltage to protect loads |
| Uc | 275 V | 275 V | Ensures SPD matches system voltage |
Feedback is provided by site engineers, operations, and project leads with experience using Type 1+2 surge protection devices in operational environments. Observations cover device behavior under system operation, surge response, continuity, and installation compatibility.
A Type 1+2 surge protection device (SPD) integrates the functions of a Type 1 SPD, which handles direct lightning currents at service entrances, and a Type 2 SPD, which manages switching surges and residual lightning energy within distribution boards. It provides comprehensive surge protection for residential, commercial, and industrial AC systems.
Yes. The Type 1+2 surge protection device (SPD) integrates the functions of both Type 1 and Type 2 surge protectors, withstanding high-energy lightning impulses (10/350 µs) as well as lower-energy switching transients (8/20 µs). A single unit provides multi-functional surge protection while saving installation space.
A Type 1+2 surge protection device is recommended for installations exposed to lightning risk, outdoor overhead lines, or service entrances. For indoor locations with low lightning exposure, a Type 2 SPD may suffice.
Yes. Type 1+2 AC surge protection devices are widely applied in industrial and commercial power systems to protect inverters, control cabinets, servers, and monitoring equipment, ensuring uninterrupted operation.
A Type 1+2 SPD should be installed at service entrances or main boards, with downstream Type 2 SPDs in sub-distribution panels. Coordination ensures system-level protection, diverting surges while maintaining safe voltage levels for connected equipment.
Most Type 1+2 SPDs feature a visual status window or remote signaling terminals. Check the indicator to verify normal operation or if module replacement is needed.
A Type 1+2 surge protection device uses high-energy MOVs, achieving fast response to transients. Ratings include lightning impulse currents (Iimp, 10/350 µs) up to 12.5 kA and nominal discharge currents (In, 8/20 µs) up to 20 kA, ensuring protection of critical equipment.
Before installing Type 1+2 AC SPDs, power must be isolated. Key precautions:
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