html{display:none} MR Manual Reset | Schweitzer Engineering Laboratories


Manual Reset

Manual Reset (MR) Fault Indicators employ a purely magnetic circuit principle. This allows the MR to operate on energy from the fault. The MR can be manually 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 nominal factory set trip rating. The display has a highly visible red (tripped) and white (reset) reflective target to indicate fault status.

Test and Reset Tools for Fault Indicators

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After a fault occurs, use an MR or Manual Button Fault Indicator (MB) before manually reclosing for inexpensive, efficient fault location.

Line-powered, battery free.

The MR model is available in a convenient kit to keep on a truck. The kit includes three MRs and a Manual Reset Tool in a sturdy, lightweight carrying case.

MR models are also applicable on overhead systems when used with industry standard hotline tools.

More than 50 years of field-proven reliability.

Worldwide ten-year warranty.

Nominal Trip Ratings100 to 800 A
Trip Tolerance±10%
System Voltage Range 
OverheadUp to 38 kVL-L
UndergroundMatches the URD Cable Rating of medium voltage distribution circuits
Maximum Fault Current25 kA for 10 Cycles
Typical Trip Response Time8 ms
Outer Diameter Clamping Range0.25" to 1.4" (Please Specify the Clamping Diameter or Range When Ordering)
Temperature Range—40° to +85°C
Approximate Weight140 g (0.31 lbs)


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