- Manual Reset (MR) Fault Indicators employ a magnetic principle using two magnetic elements. One is the yoke which is demagnetized by the fault current, allowing the other to act on the display and cause a reflective red target to show. The target is held in place magnetically until the MR is reset using the Manual Reset Tool.
- The MR is secured to the line using over-center toggle clamps and may be applied or removed with a hot stick. MR Fault Indicators have a response time of 12 ms at the trip rating. The display has a red reflective target area of 3.3 square centimeters.