Technical term in electrical engineering. Refers to a transformer that reduces voltage. Often contrasted with 昇圧変圧器 (step-up transformer).
See also: 降圧トランス
This step-down transformer reduces the input voltage to 100V.
Step-up transformer, which increases voltage, opposite of 降圧変圧器.
More casual abbreviation for step-down transformer, commonly used in conversation.
Compound of 降圧 (step-down, voltage reduction) and 変圧器 (transformer).