The Marantec 122944 Transformer Box is a genuine OEM power module designed to supply the low-voltage operating power required by select Marantec garage door opener systems. Identified by part number 122944, this transformer box is used to step down incoming mains power for the opener’s control electronics, motor control, and connected safety accessories such as photo eyes, enabling reliable daily operation in residential or light commercial applications. It serves as a direct replacement part for compatible Marantec operators that utilize an external transformer assembly, helping restore proper function when the original transformer has failed or is damaged.
This transformer box is model-specific rather than universal, so compatibility should be verified against your opener’s parts diagram or the label on the existing component before ordering. Input/output ratings and wiring requirements are indicated by Marantec documentation and on the unit label; always follow the manufacturer’s instructions and local electrical codes. Installation should be performed with power disconnected by a qualified technician, ensuring correct mounting, secure terminations to the designated control terminals, and proper strain relief. After replacement, some operators may require rechecking limits or performing standard setup per the opener manual. Use only the Marantec 122944 Transformer Box where specified to avoid damage to the control board and ensure safe, dependable operation.