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Control, isolating and safety transformers

Control, isolating and safety transformers Block has introduced a new line of control, isolating and safety isolating transformers, all featuring excellent switch-on behaviour thanks to reduced starting currents. The low inrush current also minimises the risk of disturbance to associated circuits when the supply is switched on. The transformers all offer very good corrosion protection and low noise, thanks to the proprietary Blockimpex vacuum impregnation process, and are easy to cable up through the use of spring loaded terminals, while the screw connection terminals are contacted protected in accordance with UVV BGV A3.

The transformers are offered in three versions: STE transformers with rated input voltage from 230-400V AC, STEU transformers with dual input voltage of 230 and 400V AC, and USTE transformers, with a universal input voltage from 208-600V AC. All offer output voltages from 24-230V AC. Insulation is class B, and maximum ambient temperature is rated at 40°C. Efficiency is between 94 and 96% depending on the model. The transformers are rated up to 250VA, with a combination footplate for bolted and rail mounting. The robust metal footplate is predrilled with oval slots, further simplifying mounting. The compact design delivers very high performance for the volume.

Applications include use as a control transformer for the electrical isolation of the input and output sides om accordance with VDE 0113, as an isolating transformer for the safe electrical isolation of the input and output sides in accordance with VDE 0100, and as a safety transformer for the safe electrical isolation of input and output sides in applications such as SELV and PELV circuits.
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Block UK Ltd

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