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.