We have passed ISO9001:2015,CE,SGS approval and IEC report Remark: A. D refers to the volume of a corresponding transformer, which will be replaced with a digit. For the transformer with a single winding, the corresponding max. volume can be reached; for the transformer with two or more windings, the corresponding volume will be reduced properly. B. Being a tendency of future pin transformer, it is applide with our best self-made toroidal core (Poâ?¤0.9W/Kg) in the result of High Efficiency, Low Power Loss and Low Temperature-rise to be Green, Energy-saving & Environment-friendly. C. Attributed to our Patent Technology, excluding the pins distribution mentioned above, the pins distribution can be freely adjusted by following customer's advice. D. Nice Appearance, Small Size, Moisture Proof & Mould Prevention. E. Pins Quantity can be reduced or increased based on your requirement. Minature Transformers: The dimension of the Control Transformer Usage &Toroidal Coil Structure step-up auto-transformator 380V to 200V The Partial List of GW-B Series Toroidal Transformers with Cable and Mounting Holes: 1. Installation: Horizontal (non-conventional-type base plate), sunk, side type, and bridge. 2.Application: Especially low-hum and low-dispersing construction Low-level of induction High-grade design casing possible Statically shield winding and magnetical shield winding optional Be used widely such as audio equipment,communication,new energy areas,Electrical control,Cable TV network etc. 3.Equipment: Over 50 sets toroidal/annular/ ring coil winding machines, 3 EI type transformer lines, 2 sets of vacuum annealing furnaces, A set of nitrogen and hydrogen production equipment as below: . Automatic Winding Machine . Semi-automatic Winding Machine . Toroidal Winding Machine . Insert Lamination Machine . Wave Soldering Machine . Plastic Termal Ultraviolet Machine . Domino Ink Jet Printing Machine Transformer Multitester for High & Low Frequency Layer Insulation Withstand Voltage Tester 4.Warning Under no circumstances should both ends of the fixing bolt simultaneously contact the metal chassis or framework as this would create a potentially dangerous 'shorted-turn'. 5.Certificate We have abtained CE CQC RoHs UL ISO9001:2015,SGS and IEC 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. Application: 1). audio equipment 2). electric control 3). computer 4).instrument 5).telecommunications 6).high-end and middle-end vedio etc