If you have you been looking for a way to dim your LED Lights from a wall mounted dimmer, then this is the LED Power Supply for you. Use any compatible low voltage magnetic dimmer and dim your LED lights from 0-100%. This power supply is ETL listed, CSA listed, and encased in a NEMA 3R enclosure. Built in manual reset thermal circuit breaker allows for shutdown upon an electrical short. We have 120VAC input or 277VAC input, 60Hz available. Output 12VDC up to 300w. Can be dimmed with standard low voltage magnetic dimmer, see list of compatible dimmers below. Transformer is fully encapsulated for protection against the elements. No External Fusing Required. Avoid using dimmers not rated for magnetic low voltage lighting or not labeled as symmetrical forward phase as they may cause overheating of the power supply or cause damage to the load. It is also not recommended to use dimmers with neutral connections or dimmers requiring a minimum load for proper operation.