Below is a table showing the differences between L-N type surge protectors and L-PE type surge protectors, in descending order of importance:
| Difference | L – N method surge protector | L – PE connection method surge protector |
|---|---|---|
| 1. Installation position | Installation between the phase and neutral lines | Installation between the phase and earth lines |
| 2. Protecting object | Protecting against voltage surges between line and line | Protecting against voltage surges between line and earth |
| 3. Protective principle | The protective device is triggered by monitoring the voltage between the phase line and the neutral line when the voltage exceeds the set threshold value | The protective device is triggered by monitoring the voltage between the phase line and the ground line when the voltage exceeds the set threshold value |
| 4. Scope of application | Suitable for three – phase four – wire power systems | Suitable for three – phase three – wire power systems |
| 5. Usage | Mainly used in industrial and commercial buildings, residential and other power distribution systems | Mainly used in industrial equipment, mechanical equipment and other power systems |
| 6. Protection Effect | Effectively protects equipment and circuits from voltage surges. | Effectively protects equipment and circuits from voltage surges. |
| 7. Wiring mode | Connection mode is parallel connection between L and N lines | Connection mode is parallel connection between L and PE lines |
| 8. System grounding | L – N grounding | L – PE grounding |
| 9. Current distribution | When a voltage surge occurs, the current is evenly distributed between L and N. | When a voltage surge occurs, the current flows mainly through L to PE. |
| 10. Safety | If the neutral wire is disconnected, the surge protector will still work properly | If the ground wire is disconnected, the surge protector may lose its protective capability |
