Compact power entry module features additional ground choke

The DD12 filter series combines an IEC C14 appliance plug with a 1- or 2-pole fuse holder, a 1- or 2-pole switch and a high quality mains filter. The particularly wide metal flange (horizontal or vertical) contacts the housing surface over a large area and thus enables an optimum filter and shielding effect with a large number of mounting variants.

Ground choke
New variants of the DD12 series are equipped with a ground choke. In addition to the current-compensated choke on the pole and neutral conductor, the line filters have a second choke on the earth conductor.

The ground choke is located between the device plug and the filter output. Placing the filter directly at the mains input ensures that possible high frequency interference currents on the earth conductor cannot bypass the filter via the housing.

Especially medical filters (no Y capacitors) benefit from improved asymmetrical attenuation in the higher frequency range due to the earth line choke.

Applications
The DD12 filter series is available as a standard or medical version and is used in devices that require particularly high immunity to interference. These include IT or telecom systems according to IEC 90650-1 and medical devices according to IEC 60601-1.

The series meets the new fuseholder requirements outlined in IEC 60127-6 for enhanced fire safety and is also suitable for use in home appliances according to IEC 60335-1. It is compatible with V-Lock retaining cordsets.

The DD12 series is certified for currents up to 10 A/250 VAC according to IEC standard and 8 A according to UL/CSA standard at 125/250 VAC. It is ENEC and cURus approved.