The PHPM-WBX-120-WH is a phase-adaptive power module with 3-wire fluorescent input. When connected to 20A circuit breaker, provides capacity on 3-wire fluorescent dimmer for a full 16A load of lighting. Used to dim incandescent, halogen, electronic low-voltage, magnetic low-voltage, neon/cold cathode, or Lutron Tu-wire lighting sources. Phase-adaptive technology automatically selects leading-edge or trailing-edge dimming for lowvoltage transformers. Up to 3 power modules may be controlled by a single dimmer. 120V control voltage, 120V load voltage and 50/60Hz frequency, phase-to-neutral. Not for use with non-dim loads. Phase independent of control device/control voltage. Automatically selects between forward phase/leading edge and reverse phase/trailing edge dimming/output based on connected load. Provides air-gap off. Module protects itself during most temporary over-current and over-voltage conditions. Two LEDs on front of unit provide diagnostic information (visible when faceplate is removed). Each terminal accepts up to two 12AWG wires. Indoor use only. 135BTU/hour maximum heat output of module. Surface or recess mounting. UL listed.