The MAELV-600 Dimmer from Lutron. 600W max dimming. Use with electronic low voltage transformers. Not sure if your transformer is magnetic or electronic? Look on the transformer label. Most transformers will identify magnetic or electronic. Electronic transformers are also generally much lighter than magnetic.
# Features a clean, flush, stylish appearance
# Special Features: Two taps on the switch brings lights on to full brightness; press and hold the switch to slowly fade lights to off over 10 seconds
# Multi-location dimming from up to 10 locations**
# LEDs show preset light level and glow softly to act as night light
# Uses standard single-pole and 3-way wiring for easy installation in any home
# Power failure memory
# Front accessible service switch (FASS) to disconnect load power