Schurter introduces DD12 Filtered Power Entry Module
Schurter extends its successful power entry module series DD12 with screw and snap mounting options.
An integrated ground line choke for suppressing high-frequency interference on the ground conductor is also a newly featured option.The DD12 all-in-one fuseholder, switch and EMC filter offers remarkable functionality in a very compact housing. It combines an IEC C14 appliance inlet with a 1- or 2-pole fuseholder, ON/OFF switch, and standard or medical low leakage filter. The wide metal flange (horizontal or vertical), or metal snap arms for panel thickness up to 8 millimeters, optimizes filter and shielding effect.
Ground loops arise through different impedances of different ground line connections in one or multiple pieces of equipment. While all ground connections have the same potential level for the 50 Hz load current, these can have different potential levels for high-frequency. The ground line choke, which is wired between the power-inlet connector and the filter output, smartly addresses this phenomenon. Because of its placement directly at the power line input, high-frequency interference currents on the ground line are prevented from bypassing the filter through the equipment housing. The ground line choke isolates the equipment chassis against high frequencies and the equipment ground from power line ground. This approach effectively breaks any possible ground loops.
Audio equipment for instance is known for being prone to ground loop problems. Often referred to as hum or buzz, the DD12 with ground line choke is well suited for suppressing interferences that lead to diminished sound quality. The DD12 is also well suited for medical equipment required to use low leakage filters for increased patient safety according to IEC 60601-1. The ground line choke helps to improve upon the asymmetric attenuation due to the reduced Y capacitance. Other applications include equipment that requires particularly high immunity such as IT equipment according to IEC 60950-1.
Schurter DD12 Series Features:
- Ultra-compact design. Ideal for low profile designs. Aluminum case provides good shielding.
- All single elements are already wired.
- Fuse drawer meets requirements of medical standard IEC/EN 60601-1.
- Ideal for application with high transient loads.
- Suitable for use in equipment according to IEC/UL 60950.
- Suitable for use in medical equipment according to IEC/UL 60601-1.
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