Single Phase Type 1 Surge Protection Device is designed to provide protection for low-voltage installations against lightning strikes and industrial surges.
This product complies with IEC/EN standards, suitable for single-phase power networks, effectively preventing equipment damage from surges and ensuring system safety and stability.
This single phase Surge protector for TN-S systems handles high surge currents and lightning strikes, providing reliable protection for low-voltage equipment.
This single phase Surge protector for TT or TN-S systems protects electrical installations from lightning surges by safely diverting surge currents away from equipment.
Single Phase Surge Protector (Type 1+2) is characterized by a 10/350 µs and 8/20 µs lightning current waveform and tested accroding to IEC/EN 61643-11.
Single phase surge protectors are specifically designed to safeguard low-voltage circuits from electrical surges.
They are suitable for various systems, including TN-C, TN-S, and TT power supply networks.
Single Phase Surge Protector SLP40 series is characterized by an 8/20 µs lightning current waveform and tested accroding to IEC/EN 61643-11.
Single Phase Surge Protector (Type 2+3) is characterized by a 8/20 µs and 1.2/50 µs lightning current waveform and tested accroding to IEC/EN 61643-11.
This single phase Surge protector for TN-S systems has In 10kA and Uoc 20kV.
Single Phase Surge Protector TLP series is characterized by an 1.2/50 µs lightning current waveform and tested accroding to IEC/EN 61643-11.
Single phase Surge protector for TN-S, TN-C, or TT systems, Uoc 6 kV, In 3 kA.
Single phase Surge protector for TN-C, TT, or TN-S systems, Uoc 2 kV, In 1 kA.
Single phase Surge protector for TT, TN-S, or TN-C systems protects electronics and ensures reliable operation.
Single phase surge protector is commonly installed in residential distribution boards or after the main breaker to protect household appliances and electronic devices from surges caused by lightning, sudden voltage spikes, or grid switching.
The SPD should be connected in parallel in the circuit, with the live wire to the L terminal, neutral to the N terminal, and ground to the PE terminal, using the shortest and straightest wiring possible for optimal performance.
The remote signaling terminals are connected to an external monitoring system, alarm panel, or building management system, usually via a dry contact.
This setup allows centralized monitoring of the SPD’s status without opening the panel.
At LSP, our single phase surge protectors are engineered to deliver reliable performance under the most demanding conditions. Whether you require an industrial single phase SPD, a commercial panel surge protector, or a residential single phase surge arrester, LSP ensures top-tier protection and system reliability.
LSP’s single phase surge protectors combine technical excellence, robust design, and user-focused reliability, making them the preferred choice for comprehensive surge protection in low-voltage systems.
With LSP single phase surge protectors, you can trust your electrical systems are secure, stable, and resilient against surges.
Single phase surge protectors safeguard one live conductor and a neutral, typically for residential and small commercial systems. Three-phase surge protectors protect three or four live conductors plus neutral, making them suitable for larger industrial and commercial applications where higher power loads require coordinated protection.
A Type 2+3 SPD combines two protection stages in one unit. It protects both the sub-distribution board and downstream sensitive equipment, ensuring a very low protection level (Up) while saving installation space and simplifying wiring.
Yes. A backup fuse or circuit breaker is recommended to protect the SPD and installation from follow currents and short circuits. This ensures the SPD disconnects safely from the power grid during a fault, maintaining system safety.
The protection level (Up) is the maximum voltage allowed to pass to the connected equipment during a surge. A lower Up value provides better protection, limiting overvoltage to safe levels for sensitive electronics such as computers, servers, or smart appliances.
Combining MOV (metal oxide varistor) and GDT (gas discharge tube) technology ensures effective surge protection:
While Type 3 SPDs for terminal equipment may be installed by experienced DIYers or electricians, Type 1 and Type 2 SPDs should be installed by qualified professionals. Proper installation ensures compliance with safety standards, correct grounding, and full protection for TN-S, TN-C, or TT systems.
Definition of a Single Phase SPD
A single phase surge protector, also known as a single phase surge protection device (SPD), is an electrical safety device designed to protect single-phase electrical systems (typically 230V AC) from transient overvoltages, such as lightning strikes or switching surges.
It works by diverting excessive voltage away from sensitive equipment to the ground, preventing damage to household appliances, lighting systems, and control circuits.
In a single-phase circuit, the SPD is usually connected between the live (L) and neutral (N) wires, or between live and earth (L-PE), depending on the wiring configuration. When a surge occurs, the SPD reacts within nanoseconds, limiting the voltage to a safe level.
Common types of single-phase SPDs include Type 2, and Type 3, each used at different protection levels—from Intermediate distribution boards to terminal devices.
A single-phase surge protective device is mainly used to safeguard electrical installations and equipment in residential, commercial, and light industrial environments.
It provides protection against lightning-induced surges and switching transients that can occur in single-phase systems.
Typical applications include:
Without a proper single phase surge protection, even small voltage spikes can shorten equipment lifespan or cause costly damage. That’s why installing an SPD is essential in modern low-voltage systems.
Follow these step-by-step instructions to correctly install a single phase surge protector:
1. Turn off all power supply
Before wiring, disconnect the main breaker to ensure safety.
2. Identify terminals
Check the SPD’s marking — usually labeled L, N, and PE.
3. Connect the live wire (L)
Connect the input phase line from the distribution board to the SPD’s L
4. Connect the neutral wire (N)
Link the SPD’s N terminal to the neutral bar of the distribution panel.
5. Connect the grounding wire (PE)
Connect the PE terminal to a reliable grounding system with resistance <10Ω.
6. Tighten all connections
Ensure all terminals are firmly fixed to avoid overheating or loose contacts.
7. Check indication window or test button
Some SPDs feature an indicator (green = normal, red = replace). Verify functionality.
8. Re-energize and test the circuit
After confirming proper wiring, turn on the power and ensure the system operates normally.
Click to download: Single Phase Surge Protection Device Wiring Diagram PDF
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