Ring Core Chokes Carry 800-Vdc Rating

TDK’s latest series of EPCOS current-compensated ring core power line double chokes, the RoHS-compatible B82724J8 N040 series, features a voltage rating of 800 Vdc or 250 Vac in continuous operation. They offer a range of inductance values extending from 0.5 mH to 47 mH and rated currents between 1.6A and 10A, depending on the inductance. Their rated ambient temperature without derating is +70 °C. For the additional attenuation of symmetrical interferences, the power line chokes feature a stray inductance of around 0.5% of the rated value. The dimensions for all types are 18.5 mm x 31.3 mm x 33.2 mm.


The new ring core chokes are manufactured using a flame-retardant plastic that is compliant with UL 94 V-0 and certified in accordance with IEC 60335-1, Clause 30 (glow-wire and ball pressure test). In addition, the winding is completely potted, which allows its use in highly polluted environments. Typical applications include frequency converters and power supplies. For more details, visit TDK Corporation.

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