| OSM-15.5 and OSM-27 Series |
| The tavrida OSM utilizes the reliability 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) |