The HL-S1-SX is a surge inrush current suppressor designed for both mains dimmable lamps, such as GU10s, and installations using leading or trailing edge mains dimmable LED drivers for low-voltage loads. Its purpose is to smooth out the heavy inrush of current that occurs at switch-on, one of the most common causes of nuisance breaker tripping, overheated dimmers, and reduced lifespan of drivers and lamps.
On power-up, the unit briefly routes the supply through internal high-power resistors, cutting the surge down to a safe level. Within a fraction of a second, the relay closes and restores a direct feed, so the connected load runs at full power without restriction. This ensures trouble-free startup and long-term reliability.
If you are experiencing repeated MCB trips when turning on dimmable lamps or large LED drivers, the HL-S1-SX is the straightforward solution. It not only protects the drivers and loads but also helps to safeguard the dimmer itself from stress caused by inrush current.
Compact and easy to integrate, this suppressor is suited to residential, retail, and commercial lighting applications where smooth operation and long service life are essential.
Key Features
Reduces inrush current to prevent MCB tripping
Protects drivers, dimmable loads, and dimmers from surge stress
Works with GU10s, other 240V dimmable lamps, and triac dimmable LED drivers
Bypass relay for seamless normal operation after startup
Integrated thermal fuse for extra protection
Supports loads up to 1920W and 8A total current
Standard 3-year warranty, extendable to 5 years on request
Technical Specifications
Input Voltage: AC100-240V
Frequency: 50/60Hz
Working Current: Max. 8A
Load Power: 800–1920W
Operating Temperature: –20°C to +55°C
Case Temperature (Max): +85°C
IP Rating: IP20
Dimensions: L135 × W40 × H23mm
Weight: 0.095kg
Warranty: 3 years standard (optional 5 years on request)
Certifications: UKCA, CE, RoHS, EMC, LVD, RED
Standards: EN 61347, EN 55015, EN 61547, EN 61000, ETSI EN 300/301
How It Works
At the moment of switch-on, the HL-S1-SX automatically inserts two precision resistors into the line, cutting down the peak surge that would otherwise hit the circuit. After around 40ms, the internal relay switches over to provide a direct feed.
To put it in perspective: without protection, a 220V circuit can experience surge currents of 100A at startup. With the HL-S1-SX in place, that same surge is reduced to around 17A. The result is less stress on the system, reduced risk of tripping, and longer service life for dimmers and drivers.
An MCU controls the process to guarantee accurate timing, and a thermal fuse provides a final level of safety in the unlikely event of a fault.
Installation Notes
The suppressor is wired in series with the mains supply. It can be fitted ahead of a group of 240V dimmable lamps such as GU10s, or between a dimmer and the drivers that feed low-voltage dimmable LED strips or modules.
While a single low-power lamp or driver may not need protection, larger drivers (for example 600W units) or groups of dimmable lamps switched together create high surge currents where this product becomes essential. In such cases, it also helps protect the dimmer itself from overload at switch-on.
The diagrams in the manual show the most common wiring options. To view these in detail, open the Attachments tab and download the PDF guide.
It is recommended that the connected load is kept comfortably below the maximum rating of 1920W (8A). Operating continuously at full capacity is not advised, as keeping some margin helps ensure long-term reliability and stable performance.
Additional Information
For matching accessories, use the Related Products tab. Technical details are in the Product Specification tab, and wiring guides can be downloaded from the Attachments tab. To refine searches within any category, use the Refine By filter.
