What is the difference between a step‑up and step‑down transformer?

A step‑up transformer increases voltage from primary to secondary (e.g., 110 V → 220 V), while a step‑down transformer decreases voltage (e.g., 220 V → 110 V). Johsun Tec transformers can operate in both modes.

Which devices are suitable for Johsun Tec step‑up/step‑down transformers?

Our transformers are suitable for TVs, computers, printers, audio equipment, kitchen appliances, medical devices, and industrial control panels in residential, commercial, and industrial environments.

How to choose the right kVA rating for my load?

Select a transformer rating that exceeds the total load rating by 20–25%. For example, a 1000 W load should use at least a 1.2–1.25 kVA transformer.

Can 110 V and 220 V outputs be provided at the same time?

Yes, some DT/ST and STU models offer dual‑voltage output sockets, allowing 110 V and 220 V outputs simultaneously.

Are these transformers compatible with 50 Hz and 60 Hz systems?

Most standard models are designed for 50/60 Hz, suitable for worldwide grid systems.

Can you customize special voltages (e.g., 100 V, 230 V, 277 V)?

Yes. Johsun Tec offers custom winding solutions for special voltages and frequencies upon request.

Do these transformers require professional installation?

For standard single‑phase models, simple connection between the grid and load is sufficient; however, installation by a qualified electrician is recommended for safety.

Step Up & Step Down Transformer

Travel Voltage Converter – DT/ST Series 100VA–1500VA

Повышающий и понижающий трансформатор

Преобразователь напряжения для путешествий - серия DT/ST 100VA-1500VA

Преобразователь напряжения переменного тока в постоянный серии STU STU 100VA-5000VA

Лучший туристический преобразователь напряжения серии STU 100VA-3000VA

Повышающий и понижающий тороидальный трансформатор переменного тока серии TC/THG

100VA-10KVA шаг вверх и вниз тороидальный трансформатор 110V-220V AC преобразователь напряжения TC/THG серии

110В - 220В Повышающий трансформатор ZX серии 500VA-2000VA Тороидальный преобразователь

1000VA Step Up & Down Transformer 110V to 220V Toroidal Voltage Converter ZX Series