HP-SRM SF6 Gas-Insulated Ring Main Unit
Modular SF6 RMU for 12/24/40.5 kV: C/F/V/SV/SL/M/PT units freely combined in a sealed IP67 gas tank, with left/right extension and flexible cable entry.
- Rated voltage: 12 / 24 / 40.5 kV
- Cabinet type: C load switch · F fuse combination · V vacuum breaker · SV/SL bus sectioning · M metering · PT c
- Rated current: 630 A or 1250 A
- Extension: I left · D right · ID both sides · blank non-extendable
- Cable entry: L left · R right · LR both sides
- Example: HP-SRM-12-V-12/630DL — load-switch cabinet, 12 kV, 630 A, right extension, left cable entry
A cleaner, more reliable approach to MV switching
The HP-ELS series replaces SF₆ with environmentally friendly insulating media while keeping the proven safety and performance utilities expect from gas-insulated switchgear.
Product Overview
The HP-SRM-12/24/40.5 series SF₆ gas-insulated ring main unit uses SF₆ gas as the insulating and arc-extinguishing medium in a fully sealed gas-tank structure (SF₆ rated pressure 14 bar, annual leakage ≤ 0.05 %/year). It is flexibly composed of load-switch (C), load-switch-fuse (F), vacuum-breaker (V) and isolator/earthing-switch units, with extension and two-side cable in/out options, rated 12 / 24 / 40.5 kV. The SF₆ gas compartment reaches IP67 and the enclosure IP4X; it is maintenance-free and reliable, suited to power reception and distribution in three-phase AC ring networks and terminal distribution systems.
Technical specifications
Headline ratings at a glance, followed by the full technical data sheet. Exact values are confirmed per project configuration.
| Parameter | Value |
|---|---|
| Rated voltage | 12 / 24 / 40.5 kV |
| Rated current (busbar) | 630 / 1250 A |
| Power-frequency withstand (earth & ph / break) | 42 / 48 kV |
| Lightning impulse withstand (earth & ph / break) | 75 / 85 kV |
| Rated short-circuit breaking current (V module) | 20 / 25 / 31.5 kA |
| Rated short-circuit making current (peak) | 50 / 63 kA |
| Short-time withstand current / duration | 20 · 25 kA / 4 s |
| Mechanical life | 5000 ops |
| SF6 gas compartment / fuse tube | IP67 |
| Switchgear enclosure | IP4X |
| Main busbar / earthing busbar | 240 / 160 mm² Cu |
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