| Brand | ROCKWILL |
| Series | RDK |
| Rated voltage | 40.5kV |
| Rated normal current | 200A |
| Rated short-time withstand current | 10kA |
| Rated frequency | 50/60Hz |
Designed for three-phase AC power systems operating at 50Hz with a rated voltage range of 12kV 40.5kV, the AutoLink sectionalizer is installed on overhead distribution lines to isolate faults when paired with reclosers or circuit breakers. When a fault occurs on the line and the fault current meets or exceeds the preset threshold, the sectionalizer records the number of tripping operations performed by the upstream recloser. Once this count reaches the preconfigured limit, the sectionalizer automatically trips to disconnect the faulty segment.
The AutoLink sectionalizer will initiate an automatic trip only when all three of the following conditions are met simultaneously:
If any of these conditions are not satisfied, the sectionalizer will not trigger an automatic trip. Equipped with a microcomputer and an integrated operating trip mechanism, this device operates without the need for external auxiliary power, ensuring reliable performance even in remote or inaccessible installation locations.
| Item (Rated Parameter) | Unit | RDK10-12/D315 | RDK-12/D200 | RDK-40.5/D200 |
|---|---|---|---|---|
| Rated voltage (Ur) | kV | 12 | 12 | 40.5 |
| Rated normal current (Ir) | A | 315 | 200 | 200 |
| Rated frequency | Hz | 50/60 | 50/60 | 50/60 |
| Overcurrent pick-up current range | A | 8 ... 500 | 8 ... 400 | 8 ... 400 |
| Rated short-time withstand current (r.m.s.) | kA | 10 | 10 | 10 |
| Rated short-circuit withstand duration (tk) | s | 4 | 1 | 1 |
| Rated peak withstand current | kA | 25 | 16 | 20 |
| Configurable fault counting sequence | — | 1, 2, 3 | 1, 2, 3, 4 | 1, 2, 3, 4 |
| Maximum fault memory hold time | s | 15 | 20 | 20 |
| Maximum automatic reset delay time | s | 30 | 20 | 20 |
| Permissible deviation of pick-up current for memory reset time | % | ± 10 | ± 10 | ± 10 |
| Rated opening time | ms | ≤ 180 | ≤ 200 | ≤ 200 |
| Main circuit resistance | μΩ | ≤ 300 | ≤ 400 | ≤ 400 |
| Mechanical operating life | Operations | 500 | 500 | 500 |
| Terminal horizontal pull-out force | N | 250 | 250 | 250 |
| Manual opening torque | N·m | ≤ 4 | — | — |
| Manual opening force | N | — | ≤ 120 | ≤ 120 |
| Rated lightning impulse withstand voltage (phase-to-earth) | kV | 75 | 110 | 185 |
| Rated lightning impulse withstand voltage (isolating gap) | kV | 110 | 110 | 220 |
| Rated power-frequency withstand voltage (phase-to-earth) — Dry test | kV | 42 | 55 | 95 |
| Rated power-frequency withstand voltage (phase-to-earth) — Wet test | kV | 30 | 45 | 80 |
| Rated power-frequency withstand voltage (isolating gap) — Dry test | kV | 50 | 55 | 110 |
| Rated power-frequency withstand voltage (isolating gap) — Wet test | kV | 34 | 45 | 95 |
| Rated power-frequency withstand voltage (auxiliary & control circuit) | kV | 2 | 2 | 2 |
| Pollution class (IEC 60815) | Class | III | IV | III |
| Maximum ice coating thickness | mm | ≤ 7 | ≤ 1 | ≤ 1 |
| 4-stage adjustable pick-up current & configurable fault counting sequence | — | — | Yes | Yes |
No external auxiliary power source is required. It takes energy from built‑in current‑transformer, completes fault‑current detection and counting logic by internal micro‑controller.
After permanent‑fault removal, operators can manually close it by insulated operating rod. No spare‑parts replacement is required. It will auto‑reset if fault is temporary without reaching count threshold.
Three conditions must be met simultaneously: fault current exceeds pickup setting; preset counting‑times (1‑4 times) are reached; line loses voltage and residual current below 300 mA.
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