Description: Microcontroller-based CKR Series over current relays combine both inverse time and independent time relays in one unit. These relays are used for protecting transformers, motors, generators and power lines in energy distribution systems against short circuits and grounding faults. The most important point is to achieve the uppermost protection with ability to apply selective protection. The main purpose of selective protection is locating and disconnecting the faulty circuit from the network as soon as possible but leaving the rest of the network active. The CKR Series have the following Ut characteristics according to IEC-255 and BS-142, such as: A- Normal Inverse; B - Very Inverse; C - Extremely Inverse; D - Long time Inverse; E - Independent time 1; F - Independent time 2; G - Independent time 3; and H - Independent time 4.
