Key Benefits & Features
- Compact, Space‑Saving Design
The low‑profile, pancake‑style core and winding result in a significantly smaller footprint versus EI‑type transformers—ideal when PCB or chassis space is limited. - High Efficiency & Low Loss
Toroidal cores minimize hysteresis and eddy‑current losses. Expect > 95% efficiency, reducing heat generation and energy costs in continuous‑use applications. - Quiet Operation
Precise winding and low‑flux leakage ensure virtually silent performance (< 30 dB), making these low voltage transformers perfect for noise‑sensitive environments like audio studios and medical labs. - Superior Voltage Regulation
Tight regulation (± 2% at full load) keeps output voltage steady under varying load conditions, protecting sensitive circuits from dips and surges. - Robust Construction & Safety
- Class B or F insulation options for thermal stability up to 130 °C
- Encapsulated winding for moisture and vibration resistance
- UL/Listable materials and CE safety approvals available
- Customizable Configurations
- Input voltages: 110 VAC / 115 VAC / 230 VAC (50/60 Hz)
- Output voltages: 12 VAC to 48 VAC (dual or multiple secondaries)
- VA ratings: 50 VA, 100 VA, 150 VA, 200 VA, up to 500 VA
- Mounting: PCB‑mount, chassis‑mount, or bracket options
Technical Parameters
| Capacity | SDK-500VA up to 3000VA |
| Switch | One button switch, convenient and fast. |
| Power Indicator Light | It can better know whether the machine is operating normally. |
| Input voltage | 110/120/220/240V |
| Output voltage | Other countries use the 110v output. In China, it uses the 220v output. |
| Rated frequency | 50/60Hz |
| Voltage change rate | ≤1.5% |
| Working efficiency | ≥98% |
| Heat Dissipation | It has a large heat dissipation area, high efficiency heat dissipation, and is safe and stable. |
| Portable | It is easy to carry and safe and sturdy. |
| Productmodel | Input voltage | Output voltage | (mm)xxLxWxH | |
| Domestic version | SDK-500VA | 220V | 100V 110V | 185*75*240 |
| SDK-1000VA | ||||
| SDK-2000VA | ||||
| Overseas | SDK-500VA | 110V | 220V | |
| SDK-1000VA | ||||
| SDK-2000VA | ||||
Typical Applications
- Audio Amplifiers & Hi‑Fi Equipment
Deliver clean, stable power for low‑noise audio reproduction. - Medical Devices & Laboratory Instruments
Comply with strict safety and EMI requirements. - Industrial Control & Automation
Provide reliable power for sensors, PLCs, and control circuits. - LED Lighting & Display Systems
Ensure flicker‑free operation and long LED life.
Why Choose ZHENGXI as Your Toroidal Transformer Supplier?
- Expertise & Quality: Over 30 years specializing in transformer design and manufacturing.
- Global Certifications: CE, UL, RoHS compliance ensures safe, market‑ready products.
- Fast Prototyping & OEM Service: Rapid turnaround on custom designs and private‑label orders.
- Competitive Pricing: Direct‑factory pricing for cost‑sensitive projects without quality compromise.
FAQ
Q1: What makes a small toroidal transformer better than an EI‑core transformer?
A1: Toroidal transformers offer higher efficiency, smaller size, lighter weight, low noise, and tighter voltage regulation compared to traditional EI‑core types—making them ideal for precision and space‑constrained applications.
Q2: Can you customize the output voltage and mounting style?
A2: Yes. We provide custom windings for virtually any secondary voltage (single or multiple), and you can choose PCB‑mount, bracket, or chassis‑mount configurations to suit your assembly needs.
Q3: How do I select the correct VA rating for my application?
A3: Calculate the total load current (in amps) required by your devices at the intended output voltage, then multiply by that voltage to get VA. Add a 20–30% safety margin to accommodate inrush currents—e.g., a 2 A, 24 VAC load needs at least 48 VA; choose a 100 VA model.
