4.5V Reversible Power Unit
other • 16 pcs
- Set number
- 107-3
- Availability
- In production
- Pieces
- 16
- Released
- 1971
- Theme
- Other
Where to find one
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Where it came from
The LEGO 4.5V Reversible Power Unit, cataloged as set 107-3, was released in the late 1960s as a foundational component of the LEGO train system. During this era, LEGO sought to evolve from static construction sets into functional, motorized play experiences. This unit was engineered to provide a low-voltage solution that allowed for bidirectional movement, effectively bringing life to the burgeoning track layouts of the time.
The design reflects the industrial, utilitarian aesthetic of late 1960s Danish toy manufacturing, focusing on durability and modular integration with the existing brick ecosystem. By utilizing a battery box coupled with a reversing switch, the unit allowed children to control their train's direction, a significant technical leap for the period. It is widely regarded by enthusiasts as a classic piece of early electrical engineering in hobbyist toys, signaling the company's commitment to sophisticated play systems that bridged the gap between model building and operational mechanical sets.
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About 4.5V Reversible Power Unit
4.5V Reversible Power Unit is a set in the LEGO Sets catalog on collecto.rs. Other • 16 pcs. Catalog data is sourced from Brickset. No public sets collectors track this one yet — adding yours would make you the first on collecto.rs.
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