The LiftMaster 21-7575-1 Transformer is a genuine OEM replacement component engineered for facilities powered by 575-volt three-phase service. Designed for select LiftMaster commercial door operators, it conditions incoming three-phase power and delivers the proper electrical supply to the operator’s drive and control circuits, helping restore reliable operation on systems originally configured for 575V 3PH. It is commonly used in commercial and industrial applications such as sectional overhead doors and rolling steel doors where robust, continuous-duty performance is required.
This transformer is intended exclusively for three-phase installations and should be matched to the specific operator model and configuration; always confirm compatibility using the operator’s parts diagram or service manual for part number 21-7575-1. Installation must be performed by a qualified electrician following local electrical codes and the LiftMaster wiring diagram, including correct primary lead connections, proper grounding, and appropriate overcurrent protection. After installation, verify door travel limits and entrapment protection devices per the operator’s commissioning procedure. As an OEM LiftMaster replacement part, it maintains original form, fit, and function for 575V three-phase commercial door operator setups, making it a dependable solution for maintenance or repair in Canadian and other 575V industrial environments.