The OSM Single Phase automatic circuit reclosers are designed for use on overhead distribution lines as well as distribution substation applications for all voltage classes up to 38kV.

The product is supplied complete with an RC control and communications cubicle. The RC control cubicle provides all the protection, data logging and communications functions in a single device. The OSM has been designed for use as a stand alone device that is easily integrated into distribution automation and remote control schemes using the in-built communications capability.

The product has been extensively type tested by independent laboratories to ensure long life and reliability under the harshest environmental conditions. The OSM automatic circuit recloser is the only solid di-electric insulated recloser to provide controlled arc fault venting and the independent testing provides verification of this important safety feature.

recloser single phase OSM15
recloser single phase OSM27
recloser single phase OSM38

The OSM Single Phase automatic circuit reclosers incorporate vacuum interrupters inside solid dielectric insulated poles which are housed within the arc fault venting designed, stainless steel tank. This ensures maximum life and reliability with a fully insulated arrangement inside the long life housing.

Voltage is measured on all two (2) bushings for the single phase device. Current is measured on single phase using current transformers.

Each phase of the recloser mechanism is operated by an individual magnetic actuator. The device is latched in the closed position by magnetic latching and each magnetic actuator uses a single coil.

The recloser can be mechanically tripped using the yellow mechanical hook stick operated lever in the base of the tank. The device Open/Close indication, also located in the base of the tank, uses a green ‘0’ to designate contacts are open and a red ‘I’ to designate contacts closed.


The status of the recloser is also reflected by microswitches connected to the control electronics. The electronic circuit board where the microswitch is fitted has no active elements which dramatically improves impulse immunity.

The main circuit bushings are manufactured from UV stable silicone rubber, providing a high creepage distance silicone bushing extension, which is completed with optional termination accessories.

The magnetic actuators are operated from stored energy charged capacitors located in the RC10 control cubicle. There is a rating plate located in the base of the tank that provides tank rating details in accordance with the requirements of ANSI C37.60. There is an grounding point on the side of the tank.

The OSM is supplied with tin plated brass cable connectors on each bushing. The cable connectors can be supplied in the form of tunnel terminals to suit cable up to 260mm2 (600mcm) or 2 hole NEMA cable palms.

Electronic Controls and Remote Control Navigation

The RC10 control and communications cubicle provides directional overcurrent, ground fault and sensitive ground fault relay, auto reclosing relay, instantaneous metering, event log,demand logger and remote terminal unit (RTU) for remote control in a single package.

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resloser rc10
resloser rc10 interface

NOJA Power Software

Software Tools for configuring, managing and controlling NOJA Power products.

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