HXGN17‑12 AC Metal‑enclosed Ring Main Unit (Load Switch), 12kV Indoor Ring‑Network Cabinet

HXGN17‑12 AC metal‑enclosed ring main unit (load switch) (hereinafter referred to as RMU) is a new type of high‑voltage switchgear produced to meet the needs of urban power grid renovation and construction. It is also used in power supply systems for making and breaking load current and short‑circuit current, as well as closing short‑circuit current.

This RMU is equipped with FZN25 and FZN21 vacuum load switches. The operating mechanism is a spring mechanism, which can be operated either manually or electrically. The grounding switch and disconnect blade are equipped with manual operating mechanisms.

This RMU features strong assembly integrity, small size, no risk of combustion or explosion, and reliable "five‑prevention" functions.

This RMU complies with the relevant provisions of GB3906 "AC Metal‑enclosed Switchgear for Rated Voltages of 3.6kV to 40.5kV" and IEC60420 "High‑voltage AC Load Switch‑Fuse Combination Units".

• Ambient air temperature: ‑15℃ ~ 40℃
• Altitude: ≤1000m above sea‑level
• Relative humidity: Daily average ≤95%, daily average water‑vapour pressure ≤2.2kPa; Monthly average ≤90%, monthly average water‑vapour pressure ≤1.8kPa
• Earthquake intensity: ≤Grade 8
• Surrounding air: No obvious pollution by corrosive or flammable gas
• For operation environments exceeding standard conditions, special technical solutions can be negotiated between our factory and buyers

1. Vacuum Load Switch Main Device FZN25 / FZN21 vacuum load switch delivers excellent arc‑quenching performance, stable breaking capacity and long electrical life.
2. Spring Operating Mechanism Integrated spring mechanism supports both manual and electric operation. Reliable over‑center spring design ensures fast make‑break action.
3. Complete Five‑Prevention Interlock Reliable mechanical interlock system prevents: closing earthing switch on live circuit, opening load switch under load, entering live compartment, closing breaker while earthing switch is on, and mis‑operation of disconnector.
4. Compact & Safe Design Strong assembly integrity, small footprint, no combustion or explosion risk. IP2X protection degree prevents accidental contact with live parts.
5. Flexible Configuration Customizable cabinet dimension, cable inlet‑outlet direction, auxiliary circuit voltage and fuse rating to match various project requirements.