ST Series 0.5kVA‑15kVA step‑up/step‑down transformer realizes bidirectional voltage conversion between 110V and 220V/240V for 50/60Hz global power supply. Adopting toroidal core technology, it provides high‑efficiency, stable and low‑noise power output. Equipped with complete safety protection and durable metal housing, this unit suits home, office and small industrial applications. Compact for simple installation, factory‑direct with 12‑month warranty and customizable specifications.

• 2‑in‑1 Bi‑Directional Conversion: Toggle 110V⇋220V/240V step‑up/step‑down via rear voltage selector switch.

• Universal Output Sockets: Fits US, UK, EU, AU plugs, no extra adapters required.

• 100% Full‑Power Silent Performance: High‑efficiency coils, low noise & radiation, stable continuous output.

• Complete Circuit Protection: Dual fuses / resettable circuit breaker against short‑circuit, over‑current and surge, protecting your appliances.

• Portable Flame‑Retardant Metal Housing: Built‑in heat‑dissipation vents and heavy‑duty carry handle for easy moving.

How to Choose the Right Wattage

Important Buying Guide

For safety and extended service life, select a transformer with sufficient power margin based on your appliance type:

• Resistive Loads (TV, laptops, lighting, heating pads)

Choose transformer capacity: 1.5‑2 × appliance actual wattage

• Inductive / Motor‑driven Loads (refrigerators, coffee makers, hair dryers, power tools, rice cookers)

High inrush starting current. Choose transformer capacity: 2.5‑3 × appliance actual wattage

General rule: Always pick a transformer rated at least 2‑3 times your device’s actual wattage for safe operation and longer lifespan.

• Imported Kitchen Appliances: Espresso machines, rice cookers, blenders, stand mixers

• Personal Care & Home Use: Hair dryers, air purifiers, vacuum cleaners, heated toilet seats

• Entertainment & Power Tools: Audio amplifiers, gaming consoles, power‑tool battery chargers

Q1: Can I use both the 110V and 220V output sockets at the same time?

A: Yes, as long as the total combined wattage of both connected appliances does not exceed the maximum power rating of the transformer.

Q2: Do I need to manually switch the voltage on the back before plugging it in?

A: YES! Always check the rear voltage switch before connecting to power. Set the switch to match your local wall socket voltage (e.g., set to 220V in Europe/China, or 110V in US/Japan).

Q3: What plug type comes on the power cord?

A: We supply region-specific input power cords (US Plug, EU Plug, UK Plug, AU Plug) based on your target shipping market or OEM requirements.