High-performance EMC filters have a compact design
TDK has announced a series of very compact three-line EMC filters for frequency converters. These high-performance filters are suitable for a rated voltage of 530VAC in 50/60Hz grids. The B84243A8x series currently comprises seven different types that are designed for currents of between 3 and 60A - based on a rated temperature of 50°C.
The filters are characterised by their very compact dimensions: depending on the exact model, these typically lie between 190x40x95 and 250x85x120mm. Recessed connections permit optimum access to the mounting bracket, making the filters suitable for installation in switching cabinets or where limited space is available.
The adherence to the EMC limits defined in EN 61800-3 C1 for motor cable lengths of up to 25m and C2 of up to 50m has been verified by measurements of various commercially available frequency converters with input rectifier stages.
The three-line EMC filters also feature very short discharge times. For example, at currents up to 44A the filters achieve a residual voltage of less than 60V in less than one minute. The 3A version with a leakage current of less than 2mA has been specially developed for plug-in devices that must meet low leakage current limits. The other models in the new series have leakage currents of no more than 5.1mA and can also be operated in environments with sensitive residual current devices.
The B84243A8x filters are designed for a high short-circuit current of 100kA in accordance with UL 508. Approvals according to UL, CSA and ENEC are pending.
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