FZN25-12 series load switchgear Product Overview
        The FZN25-12 is an indoor high-voltage switchgear based on Vacuum Interrupter technology, compliant with IEC 60265-1 (HV load switches), IEC 60420 (load switch-fuse combinations), and GB 3804. Its core design employs a direct-drive isolation disconnector linked to the vacuum interrupter, exposing critical components to high voltage only during switching operations. This minimizes size and weight. It supports both manual and motorized operation, enabling remote “three-tele” functions (telemetry, telesignaling, telecontrol). Suitable for routine distribution and frequent switching, it offers superior cost-efficiency versus conventional circuit breakers.

FZN25-12 series load switchgear Product Functions
        Load Control: Switching rated load current (630A), closed-loop current, and no-load transformers.
        Short-Circuit Protection: Fuse-combination models interrupt 31.5kA short-circuit currents; fuse-triggered opening time <0.06s prevents phase-loss operation.
        Earthing Safety: Integrated earthing switch with 50kA making capacity ensures maintenance safety.
        Condition Monitoring: Auxiliary circuits (AC/DC 110V/220V) enable remote monitoring of switching status and electrical parameters.

FZN25-12 series load switchgear Product Composition
Key Components
        Vacuum Interrupter: Primary arc-quenching component; long electrical life, maintenance-free.
        Isolation Disconnector: Visible isolation gap compliant with safety standards.
        Fuse Assembly: Optional SDLAJ-12/SFLAJ-12 current-limiting fuses; rated current 40A–125A; breaking capacity 31.5kA.
        Operating Mechanism:
              Manual: Standard CS6-1 or dedicated CS□ spring mechanism.
            Motorized: Dual AC/DC motor for remote operation.
        Interlocking System: Mechanical interlocks between load switch, earthing switch, and shutters prevent misoperation.
        Enclosure: Welded steel frame with insulating shutters; protection degree IP2X (IEC 60529).

Electrical Characteristics
        Insulation: Isolation gap withstand: 48kV power frequency, 85kV lightning impulse (IEC 60694).

Current Ratings:
       Rated Cable Charging Breaking Current: 10A
       Rated Transfer Current: 2000A (fuse-combination type)
       Making Capacity: Rated short-circuit making current: 50kA (peak).

Mechanical Properties
       Operating Torque: Manual ≤100Nm; motorized output ≤200N.
       Earthing Switch: Peak withstand current 50kA; short-time withstand current 20kA/2s.

Environmental Compliance
       Operating Temperature: -25°C to +40°C (motorized operation ≥ -5°C).
       Altitude Limit: ≤1000m (derating required above 1000m per IEC 60694).

Model Designation & Dimensions
Core Model Series:
FZN25-12D/T630-20: Standard with earthing switch, 630A
FZRN25-12D/T125-31.5: Fuse-combination type, 125A
FZN25-12RD/T200-31.5: Composite type (fuse + earthing switch)
Mounting: Fixed vertically to walls or metal brackets; mounting holes compatible with M16 bolts.
Dimensions: Compact design; depth ≤800mm, width ≤600mm (configuration-dependent); supports left/right operation and upright/inverted mounting.