A filter passing lab testing but still causing interference complaints once installed is one of the most common and expensive problems in industrial EMC work. Usually the root cause isn't the filter itself but a mismatch between its Class C1/C2 rating and the installation's actual environment, or a current rating too close to the load's real draw under transient conditions. This piece walks through why three phase EMI filter failures happen after deployment rather than during testing, and how BLA Etech's BL358-7-T and BL358-16-T, manufactured in India to defined emission classes, are built to be matched against the installation environment rather than just the nameplate rating, reducing this exact failure mode for OEMs and system integrators.
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