The Master DM-400b is a wall-box dimmer based on IGBT digital technology with Leading Edge and Trailing Edge mode selection. It controls lighting intensity and reduces energy consumption across a wide range of lamp types, including dimmable LED and CFL bulbs, halogen lamps, and resistive or magnetic transformer loads.

Built from precision integrated circuits and impact-resistant plastic, the unit is suited to demanding installation environments. Its Soft-Start function gradually ramps voltage at switch-on, extending lamp life. Electronic protection against short circuit, overheating, and overvoltage is built in, with automatic recovery to normal operation.

Key Features

• IGBT digital dimming technology with Leading Edge and Trailing Edge mode selection
• Soft-Start function for gradual voltage ramp-up at lamp switch-on
• Compatible with dimmable LED lamps, dimmable CFL lamps, halogen lamps, resistive loads, magnetic transformers, electronic transformers, and single-phase motors (universal and asynchronous)
• Button control from one or more switch points for on/off and brightness adjustment
• Mounts in a standard electrical switch box
• Compliant with EU directives LVD 2014/55/EU, EMC 2014/30/EU, EN 60669-1, EN 60669-2-1

Product Benefits

• Supports an unlimited number of dimmable LED lamps within the 400 W rated output
• Mode selection adapts the dimmer to the connected load type, preventing flicker
• Adjustable lower brightness limit lets you set the minimum dim level precisely
• Electronic protection with automatic recovery eliminates the need to manually reset after a fault
• Wide operating temperature range keeps performance stable in harsh conditions

Technical Specifications

• Dimmer type: IGBT Digital
• Operating voltage: 180–230 VAC
• Power line frequency: 50 Hz
• Output power: 400 W
• Control loads: Dimmable LED lamps, dimmable CFL lamps, halogen lamps, resistive magnetic transformers, electronic transformers, single-phase universal motors, asynchronous motors
• Operating temperature: -20 °C to +50 °C
• Protection: Electronic — short circuit, overheating, overvoltage, with automatic reset
• Wire size: 0.5 mm to 3.5 mm
• Mounting: Electrical switch box

Why You'll Love It

• Drop-in fit into any standard switch box — no extra enclosure needed
• Works with modern dimmable LED bulbs, so you do not need to change your lighting setup
• Automatically recovers from faults without requiring a manual reset
• CE-certified and standards-compliant for safe use in Greek and EU residential installations