TDK Corporation announces the addition of higher power, three-phase AC input models to the TDK-Lambda DRB series of economically priced DIN rail mount power supplies. With 24 V, 48 V, and 72 V outputs, the products are rated for continuous operation at 480 W or 960 W and can deliver a boost of 720 W and 1440 W respectively for up to seven seconds. This, and a constant current overload characteristic, enables operation with capacitive and inductive loads. These power supplies also feature a very low energy inrush current upon initial start-up, reducing the nuisance tripping of input circuit breakers. The DRB three-phase series can be used in a wide range of applications, including conventional switch cabinets, stand-alone machinery, and industrial systems, as well as information and communications technology.

The units have a wide input range of 350 to 575 V_ac and are housed in a rugged metal enclosure with dimensions of 65 mm (width) x 129 mm (height) x 159.3 mm (depth) for the 480 W models and 100 mm (width) x 129 mm (height) x 171.9 mm (depth) for the 960 W. This saves space on the DIN rail for other components and reduces cost. A choice of screw terminals or push-in connectors are available for the input and output wiring. The DRB480 and 960 models have a high operating efficiency of up to 96.3% and a low standby power consumption of <2.3 W when using the remote on-off function (inhibit). This reduces energy usage and contributes to a lower CO₂ footprint of the entire system. Lower losses also reduce internal heating inside the power supplies, preventing electrolytic capacitor dry-out for long field life.

For higher power or redundant systems, the front panel DIP switch enables droop mode current sharing for parallel operation. These new models have a wide adjustment range of 22.5 to 29 V (24 V nominal), 45 to 56 V (48 V nominal), and 70 to 85 V (72 V nominal) to allow compensation for cable drops, ORing FETs or setting to non-standard output voltages. In addition to two LED indicators, a DC OK relay contact is available for remote monitoring, and remote on/off is possible by applying an external voltage to the inhibit relay contact.

Input to output isolation is 3,510 V_ac, input to ground 2,210 V_ac, and output to ground is 1,390 V_ac. The DRB models are convection cooled and rated for operation in -25 to +70°C ambient temperatures, with derating above 55°C.

The units are certified to IEC/EN/UL/CSA 62368-1, 61010-1, 61010-2-201 and are CE / UKCA marked to the Low Voltage, EMC, and RoHS Directives. They meet EN 55011-B and CISPR11-B radiated and conducted emissions. The series also complies with EN 61000-3-2 (Class A) harmonic currents and IEC/EN 61000-6-2 immunity standards.

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