Quick Answer: Type 1+2 Surge Protection Device vs Type 2
The primary decision between a Type 1+2 Surge Protection Device and a Type 2 only unit depends on your building’s exposure to lightning. Standalone homes, industrial facilities with lightning rods, or buildings in high-keraunic areas must prioritize a combined Type 1+2 solution at the main service entrance to handle direct impulse currents. For residential units in dense urban environments without external lightning protection systems, a standard Type 2 SPD is typically sufficient to manage internal switching transients.
Choosing a Type 1+2 Surge Protection Device offers a comprehensive, all-in-one defense that simplifies installation while saving panel space. While a Type 2 SPD provides a cost-effective secondary shield against common operational surges, it lacks the high-energy capacity (Iimp) required to survive direct atmospheric discharges. Always match your selection to the building’s specific risk profile and local IEC 61643-11 compliance requirements to ensure long-term electrical safety.
Type 1+2 Surge Protection Device vs Type 2: Core Comparison Table
Technical differentiation between protection levels is essential for maintaining the integrity of a coordinated surge protection system. The primary distinction lies in the energy handling capacity and the specific lightning protection zones (LPZ) they are designed to bridge. A Type 1+2 Surge Protection Device acts as a robust barrier between LPZ 0 and LPZ 2, whereas a standard Type 2 unit is typically limited to protecting the transition between LPZ 1 and LPZ 2 or higher.
| Key Feature | Type 1+2 Surge Protection Device | Type 2 SPD Only |
| Waveform | 10/350 us (Lightning) + 8/20 us (Surge) | 8/20 us (Surge Only) |
| Impulse Current (Iimp) | 12.5kA – 50kA (Direct strikes) | Not applicable |
| Nominal Discharge (In) | 20kA – 40kA | 20kA – 40kA |
| Max Discharge (Imax) | Up to 100kA | 40kA – 100kA |
| Voltage Protection (Up) | Typically <= 2kV | Typically <= 2kV |
| Installation Location | Main Distribution Board (MDB) | Sub-distribution Panels (SDB) |
| Protection Zone | LPZ 0A/B -> LPZ 1 & 2 | LPZ 1 -> LPZ 2 |
| Coordination | Self-coordinated (Integrated) | Requires Type 1 decoupling |
| IEC Standard | IEC 61643-11 Class I + II | IEC 61643-11 Class II |
Beyond the data, the most practical advantage of a Type 1+2 Surge Protection Device is the elimination of the minimum coordination distance. In traditional installations, separate Type 1 and Type 2 arresters must be separated by at least 10 meters of cable to ensure proper triggering order. By choosing an integrated solution, you simplify the electrical layout while ensuring that both high-energy atmospheric discharges and fast-rising internal transients are managed within a single, space-saving module.
What is a Type 1+2 Surge Protection Device?
A Type 1+2 Surge Protection Device is a high-performance combined arrester designed for primary defense at the electrical service entrance. This integrated solution merges the robust lightning current handling of Type 1 protectors with the precise voltage clamping of Type 2 devices. By managing high-intensity lightning and switch surge within a single unit, it ensures total system resilience against external and internal overvoltage threats.
Core Advantages of the Type 1+2 Surge Protection Device
The primary benefit is combined lightning current and transient surge protection for both 10/350 us and 8/20 us waveforms. While discharging high-energy impulse currents (Iimp), this protector simultaneously manages nominal discharge currents (In). This dual-rated capacity shields the main distribution board from direct lightning currents and induced surges without protection gaps.
Efficiency is achieved by eliminating separate components and decoupling inductors. A Type 1+2 Surge Protection Device integrates stages internally, saving DIN rail space and simplifying wiring. This design removes coordination distance requirements, reducing installation complexity and material costs for contractors.
Typical Application Scenarios
Standalone buildings with external lightning protection systems (LPS) must use a Type 1+2 Surge Protection Device to manage direct lightning risk. These combined arresters serve as the first line of defense for structures with lightning rods or in exposed locations, safely diverting energy to earth to protect internal sensitive electronics.
Critical infrastructure, including data centers and hospitals, relies on MOV and GDT technology within these devices to prevent downtime from lightning or industrial switching surges. These integrated solutions provide reliable, low-maintenance protection compliant with IEC 61643-11 for remote industrial sites and solar farms.
When You Must Choose a Type 1+2 Surge Protection Device
A Type 1+2 Surge Protection Device is mandatory when lightning risk assessments per IEC 62305 indicate high structural exposure. This combined protector is essential for buildings with external lightning protection systems (LPS), such as lightning rods, to safely discharge direct 10/350 us impulse currents. Standard Type 2 units are unsuitable here as they lack the certified Iimp rating required to clamp lightning surges.
High-Risk Environment Indicators
Geographical and structural factors serve as the primary triggers for selecting a Type 1+2 Surge Protection Device. Facilities in regions with high keraunic levels (exceeding 25 strike days/year) or buildings taller than 8 meters face significantly elevated risks of lightning attachment. Furthermore, standalone structures with external antennas, CCTV, or long outdoor cable runs must utilize combined arresters to prevent high-energy penetration into internal circuitry.
When Type 2 Surge Protection Device is Sufficient
A Type 2 surge protection device (SPD) is the standard choice for environments where the risk of direct lightning current is mitigated. In these scenarios, the primary threat is limited to indirect surges or internal switching transients overvoltage(8/20 us waveform). This option provides a cost-effective solution for buildings without external LPS, where the focus is on clamping transient overvoltages rather than discharging direct lightning current.
Low-Risk Urban Applications
Dense urban centers often benefit from environmental “shielding” provided by adjacent tall structures, minimizing the need for Iimp-rated devices. Apartments or offices without rooftop metal equipment typically rely on Type 2 SPDs to safeguard electronics from utility switching surges. These units are ideal for budget-conscious projects requiring reliable protection against common operational transients within a safe lightning protection zone.
Cascading Protection Strategy with Type 1+2 Surge Protection Device
A coordinated surge protection system ensures that high-energy pulses are attenuated in stages before reaching sensitive loads. Implementing a cascading strategy involves utilizing different SPD types to reduce the residual voltage protection level (Up) progressively. Using a Type 1+2 Surge Protection Device at the entrance simplifies this hierarchy by merging the first two defense stages into a single, high-capacity module.
Multi-Level Coordination with Type 1+2 Surge Protection Device
| Protection Level | Device Type | Installation Location | Function |
| Primary Defense | Type 1+2 Surge Protection Device | Main Service Entrance | Discharges lightning current & bulk energy |
| Secondary Defense | Type 2 SPD | Sub-distribution Panels | Clamps residual transient overvoltages |
| Terminal Protection | Type 3 SPD | Near Sensitive Equipment | Fine protection for PLCs and servers |
LSP Type 1+2 Surge Protection Device Product Lineup
LSP provides a specialized Type 1+2 Surge Protection Device range engineered to meet the stringent demands of residential, commercial, and industrial power systems. These devices are available in multiple configurations, including 1-pole to 4-pole designs, to ensure compatibility with various earthing arrangements such as TN-S, TN-C, and TT systems. By selecting a model from the FLP series, users gain access to high-performance lightning current handling and transient overvoltage suppression in a single DIN-rail module.
High-Performance Models for Every Application
| Model Series | Grid System | Impulse Current (Iimp) | Voltage Protection (Up) | Max Voltage (Uc) |
| FLP-12.5 series | TN / TT | 12.5 kA per pole | <= 2 kV | 275V / 385V / 440V |
| FLP-7 series | TN / TT | 7 kA per pole | <= 2 kV | 275V / 385V / 440V |
FAQ: Type 1+2 Surge Protection Device vs Type 2
What is the main difference in energy handling between a Type 1+2 Surge Protection Device and a Type 2?
The difference lies in the waveform capacity. A Type 1+2 Surge Protection Device is tested with a 10/350 us waveform to handle high-energy direct lightning (Iimp). A Type 2 SPD uses the 8/20 us waveform designed for lower-energy switching transients (In).
Can I replace two separate units with one Type 1+2 Surge Protection Device?
Yes. It saves DIN rail space and eliminates the need for decoupling inductors or coordination distances. This integrated solution ensures both protection stages function harmoniously within a single module.
How does a Type 1+2 Surge Protection Device improve safety in TT or TN-S systems?
At the main panel, it provides a centralized path to discharge lightning currents before they reach the internal network. This ensures both live-neutral and neutral-earth surges are clamped effectively across different earthing arrangements.
Is an IEC 61643-11 certified Type 1+2 protector mandatory for industrial sites?
Per EN 62305, it is mandatory if the site has an external lightning protection system or high exposure. Even without lightning rods, it is recommended to safeguard sensitive PLCs from industrial switching transients.
How can I determine if my Type 1+2 Surge Protection Device needs replacement?
Perform quarterly visual inspections. A non-red light means operational status, while a red indicator signals abnormal status or failure. LSP’s modular design allows rapid plug replacement without disconnecting main wiring.
What role does the Voltage Protection Level (Up) play in a combined SPD?
Up defines the maximum residual voltage reaching downstream equipment. A high-quality Type 1+2 unit maintains Up <= 2 kV, protecting sensitive electronics while discharging kiloamperes of lightning current.
