13/01/2026
Installation Tip – Inrush Current & MCB Tripping
The HL-S1-SX inrush / surge current suppressor is designed to reduce the high inrush current that occurs when multiple LED drivers power up at the same time.
This situation is very common in LED strip installations where:
• Several drivers are connected on the same circuit
• All drivers are switched ON together from a wall switch
• The circuit is protected by a low-amp MCB or RCBO
Even when each driver is low wattage, the combined inrush current at switch-on can be many times higher than the running load. This can cause nuisance tripping, especially with modern electronic LED drivers.
This issue is frequently seen with:
• LED strip lighting systems
• Multiple IP67 metal drivers
• GU10 LED lamps installed in groups
• Circuits where many drivers energise simultaneously
The HL-S1-SX limits the initial inrush current, allowing multiple drivers to start smoothly without overloading the protective device. This helps prevent unwanted MCB tripping and reduces electrical stress on both the drivers and the circuit protection.
As shown, when used in line with metal IP-rated drivers, the earth conductor must be looped through externally to maintain earth continuity. The suppressor itself is housed in a plastic enclosure and does not require earth.
Installation must always be carried out by a qualified installer in accordance with wiring regulations.