html{display:none} SEL-MR Manual Reset Fault Indicator | Schweitzer Engineering Laboratories


Manual Reset Fault Indicator

The SEL-MR is a portable manual reset fault indicator and troubleshooting tool for overhead and underground applications up to 38 kV. It is made of a purely magnetic circuit that trips on the magnetic fields generated by the fault current. The SEL-MR is fault-powered and does not require a battery or system load current or voltage to operate.

The SEL-MR is designed to be a portable fault detection tool for line crews to use after an outage occurs to pinpoint fault location when manually reenergizing the circuit.

At the nominal factory-set trip rating, the SEL-MR has a response time of 12 ms. The display has a reflective, highly visible red target (tripped) and white target (reset) to indicate the fault status. The SEL-MR is secured to the line using over-center toggle clamps and can be applied or removed with a hot stick. The hermetically sealed, ultrasonically welded housing and stainless steel, vinyl-coated clamping mechanisms make it suitable for use in submersed and corrosive environments.

A button reset option is available to simplify reset without removing the SEL-MR in underground applications.

Test and Reset Tools for Fault Indicators

Starting At

$38 USD

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Safe and efficient reclosing—After a fault occurs, you can use the SEL-MR to determine the location and confirm the fault clearance before manually reclosing. This avoids costly repetitive refusing and resectionalizing.

Versatile application—The SEL-MR works with overhead covered or bare conductors and underground cables in distribution systems up to 38 kV.

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

Apply SEL-MRs after an outage occurs to determine the fault location when manually reenergizing the circuit.

 SEL-MRSEL-MR With Reset Button
Nominal Trip Ratings100 A to 800 A200 to 800 A
Trip Tolerance±10%
Typical Trip Response Time12 ms
Overhead System Voltage RangeUp to 38 kV (line-to-line)Not applicable to overhead conductors
Underground System Voltage RangeEqual to voltage class of shielded underground cable
Maximum Fault Current25 kA for 10 cycles
Outer Diameter Clamping Range6.35 mm to 35.56 mm (0.25" to 1.4")
Temperature Range–40° to +85°C (–40° to +185°F)
Approximate Weight140 g (0.31 lbs)170 g (0.37 lbs)


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