Some systems, are expected to work fast and also free of attrition and free of distortion. For fast such applications, which require reactive power compensation, in real-time BLR-CM-T range of fast operating power factor control relays. Further the BLR CM-T-3A allows in combination with single-phase thyristor-switches an exact power factor correction individually per phase. The BLR CM-T range offers integrated power and energy metering also monitoring of THD-V and THD-I apart from individual harmonics measurement upto the 30th level on V and I. The feature that makes the CMt technically very robust is its ability to operate under very challenging conditions and yet deliver true RTPF operation in 20msec measurement operations.