Image | Item No. | Description |
| 706-1 (Inv) | 12V Rail Contact Wire with Transformer Connector 1 Part, 1969 Catalog: Sets: Train: Supplemental: 12V |
| 706-3 (Inv) | 12V Rail Contact Wire with Transformer Connector with Cap 1 Part, 1974 Catalog: Sets: Train: Supplemental: 12V |
| 740-2 (Inv) | 12V Transformer for 220V Pack 1 Part, 1969 Catalog: Sets: Train: Supplemental: 12V |
| 741-1 (Inv) | 12V Transformer for 220V Pack 1 Part, 1974 Catalog: Sets: Train: Supplemental: 12V |
| 742-1 (Inv) | 12V Transformer for 110V Pack 1 Part, 1969 Catalog: Sets: Train: Supplemental: 12V |
| 4548-1 (Inv) | Transformer and Speed Regulator 3 Parts, 1991 Catalog: Sets: Train: Supplemental: 9V |
| 4561-1 (Inv) | Railway Express with Transformer and Speed Regulator 618 Parts, 9 Minifigures, 1999 Catalog: Sets: Train: 9V |
| 7864-1 (Inv) | Transformer / Controller 12V 28 Parts, 1980 Catalog: Sets: Train: Supplemental: 12V |
| 8887-1 (Inv) | Power Functions Transformer 10VDC 1 Part, 2009 Catalog: Sets: Power Functions |
| 9750-1 (Inv) | Interface A (LEGO Interface Box & Transformer) 3 Parts, 1 Book, 1986 Catalog: Sets: Educational & Dacta: Technic: Supplemental |
| 9833-1 (Inv) | AC Adapter, 230V - 10V Transformer 1 Part, 1996 Catalog: Sets: Educational & Dacta: Supplemental |
| 9833-2 (Inv) | AC Adapter, 120V - 10V Transformer 1 Part, 2000 Catalog: Sets: MINDSTORMS: NXT |
| 9833-3 (Inv) | AC Adapter, 230V - 10V Transformer Type G Plug (British) 1 Part, 2006 Catalog: Sets: MINDSTORMS: NXT |
| 45517-1 (Inv) | AC Adapter, 120V - 10V Transformer (for use with 8878, 9693, and 45501) 1 Part, 2015 Catalog: Sets: MINDSTORMS |
| 45517-2 (Inv) | AC Adapter, 220V - 10V Transformer (for use with 8878, 9693, and 45501) - CEE 7 Plug 1 Part, 2013 Catalog: Sets: MINDSTORMS |
| 45517-3 | AC Adapter, 220V - 10V Transformer (for use with 8878, 9693, and 45501) - BS 1363 Plug 2013 Catalog: Sets: MINDSTORMS |
| K9833-2 (Inv) | Rechargeable Battery Set (AC Adapter, 230V - 10V Transformer) 2 Sets, 2006 Catalog: Sets: MINDSTORMS: NXT |