OSM-15.5 and OSM-27 Series

The tavrida OSM utilizes the reliablility of the ISM-LD series for outdoor circuit breaker applications. Weighing less than 154lbs, the OSM is bundled with a number of features in a very compact enclosure. Non-saturable Rogowski coils in each pole guarantee high accuracy current measurement for all three phases and residual current. Voltage measurement is achieved through six capacitive voltage sensors built into the bushings. The bushings themselves are covered by silicone rubber , with the entire package encased in an aluminium dead tank,

Capable of more than 30,000 close - open operations at full load or 200 short circuit events, the OSM has been proven in emerging markets where many installations trip daily due to aging infrastructure. Coupled with the advanced Tavrida RC05E recloser control, the OSM is the most reliable, maintenance free recloser on the market.

Basic Operating Parameters OSM/TEL 15.5-16/630.204 OSM/TEL 27-12.5/630.205
Rated voltage (Ur) 15.5 kV 27 kV
Rated power frequency withstand voltage (Ud), 1 min dry 50 kV 60 kV
Rated power frequency withstand voltage, 10 s wet 45 kV 50 kV
Rated Lightning impulse withstand voltage (peak) (Up) 110 kV 125 kV (150kV on request)
Rated current (Ir) 630 A 630 A
Cable charging current 31.5 A 31.5 A
Line charging current 10 A 10 A
Rated short-circuit breaking current (lsc) 16 kA 12.5kA
Rated peak withstand current (Ip) 40 kA 31.5kA
Rated short-time withstand current (Ik) 16 kA 12.5 kA
Rated duration of short ciruit (tk) 4 s 4s
Rated frequency (fr) 50/ 60Hz 50/ 60Hz

Standards OSM/TEL 15.5-16/630.204 OSM/TEL 27-12.5/630.205
Standards IEC 62271-100
IEC 62271-200
IEC C37.60-2003
IEC 62271-100
IEC 62271-200
IEC C37.60-2003

Switching performance OSM/TEL 15.5-16/630.204 OSM/TEL 27-12.5/630.205
Mechanical Life (CO-cycles) 30,000 30,000
Operating cycles, rated current (CO-cyles) 30,000 30,000
Operating cycles, rated-short circuit breaking current (0-operations) 200 200
Closing time, not more than 77 ms 77 ms
Opening time, not more than 32 ms 32 ms
Rated operating sequence 0-0.1s-C0-1s-C0-1s-CO 0-0.1s-C0-1s-C0-1s-CO

Other data OSM/TEL 15.5-16/630.204 OSM/TEL 27-12.5/630.205
Resistance of main circuit < 85 µOhm < 95 µOhm
Weight 65kg 70kg
Altitude 3000 m (above 1000m derating
according to ANSI C37 .60)
3000 m (above 1000m derating
according to ANSI C37 .60)
Humidity 100%, condensing 100%, condensing
Solar radiation ≤ 1.1 kW/m2 ≤ 1.1 kW/m2
Temperature range -40°C to +55°C -40°C to +55°C
Type of driving mechanism Monostable magnetic actuator Monostable magnetic actuator
Pollution Level Very heavy (as defined in IEC 60815) Very heavy (as defined in IEC 60815)

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