The B+L FX97311B is a dimmable, 300w electronic transformer that converts 120vac to 12vac. The FX Series transformers are designed to work with today's architectural lighting controls systems to power 12V or 24V lamps noiselessly. The advanced circuitry of FX transformers enables them to operate with regular incandescent dimmer as well as architectural type dimming controls without the need for an interface. All FX transformers have infinite dimming range from 0 to 100%. 75W to 300W loads. Other features include Class B insulation and RFI. UL, ULC recognized.