UL 697:2021 PDF Download

The UL 697:2021 standard establishes requirements for toy transformers designed for use on nominal 120-V branch circuits. These transformers are of the low-secondary-voltage type and are primarily intended to supply power to electrically operated toys. They are specifically designed to reduce the risk of fire caused by overheating or an eventual inoperative condition, considering the expected careless use and possible short circuits that may occur with these toys.

The standard does not cover toys or similar devices that are designed to operate directly from the secondary output of a toy transformer. It focuses solely on the safety and construction requirements for the transformers themselves.

Additionally, the standard mentions that toy transformers marked as "Class 2" also need to comply with the requirements specified in the Standard for Class 2 Power Units (UL 1310) in addition to the requirements outlined in UL 697:2021. This suggests that there are additional specifications and evaluations for transformers carrying this classification to ensure their safe operation.