DU / SU Series Power Isolation Transformers Industrial Grade Step-Up or Step-Down Transformers Signals DU and SU transformers have been designed to provide a multitude of step-up or step-down voltage configurations to accommodate various input voltages available throughout the world. General Specifications Power - 250 VA to 10 KVA (500 VA to 20 KVA possible if used as auto-transformer) Dielectric Strength - 2500 Vrms Hipot Primaries - Dual/tapped primaries: - Parallel connected (104 V, 110 V, 120 V - 50-500 Hz) - Series connected (208 V, 220 V, 230 V, 240 V) Secondaries - Dual/tapped secondaries: DU Series: - Parallel connected (104 V, 110 V, 120 V / 50-500 Hz) - Series connected (208 V, 220 V, 230 V, 240 V / 50-500 Hz) SU Series: - Parallel connected (208 V, 220 V, 240 V / 50-500 Hz) - Series connected (416 V, 440 V, 460 V, 480 V / 50-500 Hz) Electrostatic Shield - Solid copper foil connected to ground. The connection may be opened if an un-grounded shield is desired. Terminals - Nickel plated brass screw-type terminals Insulation System - Class B, 130 C Higher insulation classes available DU-1, DU-2 and DU-3 are UL 5085-1, UL 5085-2 for construction, spacing and insulation system RoHS Compliant belfuse.com/signalDU / SU Series Datasheet Part Number Selection Series Secondaries Parallel Secondaries Series Secondaries Parallel Secondaries Part Part KVA KVA Number Max Max Max Max Number Volts Volts Volts Volts Amps Amps Amps Amps SU-1/4 DU-1/4 1/4 0/208/220/240 1.1 0/104/110/120 2.2 1/4 0/416/440/480 0.55 0/208/220/240 1.1 SU-1/2 DU-1/2 1/2 0/208/220/240 2.3 0/104/110/120 4.6 1/2 0/416/440/480 1.15 0/208/220/240 2.3 SU-1 DU-1 * 1 0/208/220/240 4.5 0/104/110/120 9 1 0/416/440/480 2.25 0/208/220/240 4.5 SU-2 DU-2 * 2 0/208/220/240 9 0/104/110/120 18 2 0/416/440/480 4.5 0/208/220/240 9 SU-3 DU-3 * 3 0/208/220/240 14 0/104/110/120 28 3 0/416/440/480 7 0/208/220/240 14 SU-5 DU-5 5 0/208/220/240 23 0/104/110/120 46 5 0/416/440/480 11.5 0/208/220/240 23 SU-7.5 DU-7.5 7.5 0/208/220/240 31 0/104/110/120 62 7.5 0/416/440/480 15.5 0/208/220/240 31 SU-10 DU-10 10 0/208/220/240 41 0/104/110/120 82 10 0/416/440/480 20.5 0/208/220/240 41 DU Transformer SU Transformer SU Transformer DU Transformer 120 240 120 120 240 120 120 120 110 220 110 110 110 220 110 110 104 104 104 208 104 104 208 104 Primaries Secondaries Primaries Secondaries Secondaries Primaries Primaries Secondaries 0 0 0 0 0 0 0 0 120 120 120 120 120 240 120 240 110 110 110 110 110 220 110 220 104 104 104 104 104 208 104 208 0 0 0 0 0 0 0 0 Electrostatic Shield Electrostatic Shield Electrostatic Shield Electrostatic Shield As shown on the schematic diagram the DU line incorporates dual primaries and secondaries. All four windings are identically rated at 0/104/110/120 V. This permits series or parallel connections on either primary or secondary. Therefore, a nominal 110 V to 110 V, 220 V to 220 V, 110 V to 220 V, or 220 V to 110 V transformer can be configured. The winding tap permits intermediate series ratings such as 208 V, 214 V, or 230 V. It is also possible to make auto-transformer connections by connecting a primary group in series with a secondary group. Such nominal ratings as 440 V to 220 V or 220 V to 440 V can be configured in addition to the standard ratings described above. A further advantage to auto- transformer connection is the fact that the kVA rating of a particular type is doubled. * USR component transformer evaluated to the standard for General Purpose transformers, UL 5085-1, UL 5085-2 for construction, spacing and insulation system. Provided with a Class 105 insulation system. Transformers are intended for use in end-product equipment. RoHS Compliant Custom versions available upon request. 128 Atlantic Avenue, Lynbrook, NY 11563 Toll Free 866-239-5777 Tel 516-239-5777 Fax 516-239-7208 sales signaltransformer.com techhelp signaltransformer.com belfuse.com/signal 2019 Signal Transformer Specifications subject to change without notice DU/SU Series 12.19