NOJA OSM Three 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.


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Part Number OSM15-16-800 OSM27-12-800 OSM38-12-800 OSM38-16-800
Manufacturing model 311//312/310  311/312/310 311/302/300 301/302/300
Current Sensing 3 x Current Transformers 3 x Current Transformers 3 x Current Transformers 3 x Current Transformers

Voltage sensing

6 x Voltage Screens 6 x Voltage Screens 6 x Voltage Screens 6 x Voltage Screens
Rated Maximum Voltage 15.5kv 27kV 38kV 38kV
Rated Continous Current 800A 800A 800A 800A
Fault Make Capacity RMS 16kA 12.5kA 12.5kA 16kA
Fault Make Capacity PEAK 40kA 31.5kA 31.5kA 40kA
Fault Break Capacity 16kA 12.5kA 12.5kA 16kA
Mechanical / Full load Operations 30,000 30,000 30,000 30,000
Fault Break Capacity Operations 70 70 70 70
Short Time Current Withstand 16kA/3 secs 16kA/3 secs 12.5kA/3secs 16kA/3 secs
Mainly Active Breaking Capacity 800A 800A 800A 800A
Cable Charging Current 25A 25A 40A 40A
Line Charging Current 5A 5A 5A 5A
Impulse Withstand Phase to Earth & Phase to Phase 110kV 150kV 195kV 200kV
Impulse Across the Interrupter 110kV 150kV 170kV 170kV
Power Frequency Withstand Phase to Earth ( Dry) 50kV 60kV 70kV 70kV
Power Frequency Across the Interruptor 50kV 60kV 70kV 70kV
Ambient Temperature -40oC to +55oC -40oC to +55oC -40oC to +55oC -40oC to +55oC
Humidity 0-100% 0-100% 0-100% 0-100%
Altitude 3000m 3000m 3000m 3000m
Weight of the tank( Three Phase) 100Kg 109Kg 150Kg 150Kg

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