We have passed ISO9001:2015,CE,SGS approval and IEC report 1.Technical parameters Power Input Voltage(V) Output Voltage(V) Dimension OD*H(mm) Weight (kg) GWB50VA 220V (230V) 12V 80*38 0.74 GWB100VA 220V (230V) 12V 95*45 1.25 GWB200VA 220V (230V) 12V 112*52 2.05 GWB250VA 220V (230V) 12V 118*54 3.36 GWB500VA 220V (230V) 12V 140*65 4.2 GWB1000VA 220V (230V) 12V 170*75 7.2 GWB1500VA 220V (230V) 12V 180*85 9.75 GWB2000VA 220V (230V) 12V 185*105 12 GWB3000VA 220V (230V) 12V 200*120 16.6 GWB5000VA 220V (230V) 12V 230*135 24 2. We have abtained VDE,UL,CE,ISO9000 approval .we guarantee quality is the first. Test process: 1). No-load test (included no-load voltage,no load current and no load loss) 2). IInductive voltage test 3). Load test (load voltage and temperature rise 4). Temperature rise test . 5). Insulated resistance 6).Hi-pot test 7).Leakage indutance test 8).DC resistance test 9).Surface inspection. 3.customized audio toroidal transformer and solar energy transformer Application: Grewin Electrical Supply Toroidal Transformer with ISO9001: 2015 1). Application: 1. audio equipment 2. electric control 3. computer 4.instrument 5.telecommunications 6.high-end and middle-end vedio etc 2). Advantages: 1.High quality 100% copper core 2.a full range of toroidal transformer 3.Specially sales and technical services:5-10Years 4.With 14 years' producing history in transformer induatry 5.our company have cooperated with many customers around the world and gained good reputation at home and abroad. 3).Note The above-mentioned toroidal transformer is frequently-used, we can also manufacture the products by customer design. And the specification is for reference, if has the change further, please take the material object as the standard. 4).GREWIN'S Dimension : External diameter: 40mm-300mm, height :13mm-130mm, Efficiency: 75-98% we can design the appropriate products according to customers' requirments such as installation dimension, input and output voltage,power...etc.) 4.product procedure The following picture showed you about all finished toroidal transformer production line and package with export standard carton and strong pallets: Grewin Electrical Supply Toroidal Transformer with ISO9001: 2015