Three-phase input DIN rail power supplied feature +20% peak power capability and low energy inrush current

TDK Corporation has announced the addition of three-phase AC input models to the TDK-Lambda DRB series of DIN rail mount power supplies. Rated for continuous operation at 120W and 240W with 12V, 24V and 48V outputs, the units can deliver a peak of 144W and 288W for two seconds. This, and a constant current overload characteristic, enables operation with capacitive and inductive loads. These power supplies also feature a low energy inrush current upon initial start-up, reducing nuisance tripping of input circuit breakers.

The DRB three-phase series is suitable for a wide range of applications, including conventional switch cabinets, decentralised machinery and industrial systems, through to information and communications technology.

Accepting a wide range input of 350 to 575Vac, the units are housed in a rugged metal case measuring 55mm wide, 129mm high and 138.2mm deep, saving space on the DIN rail for other components. The high operating efficiency of up to 94 per cent and low off-load power consumption, which can be reduced to <2.3W when in standby mode using the remote on-off, reduces energy consumption. Lower power losses reduce internal heating and increase electrolytic capacitor lifetime.

For higher power or redundant systems, the front panel DIP switch enables droop mode current sharing for parallel operation. All models have a wide adjustment range of 11.4 to 15V, (12V model), 22.5 to 29V (24V models) and 45 to 56V (48V model) to allow compensation for cable drops, ORing FETs or setting to non-standard output voltages. In addition to an LED indicator, a DC OK relay contact is available for remote monitoring and remote on/off is possible by closed relay contact or <4V input.

Input to output isolation is 3,510Vac, input to ground 2210Vac and output to ground is 1,390Vac. The DRB models are convection cooled and rated for operation in -25 to +70 degrees C ambient temperatures, with derating above 55 degrees C.

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