Lower Isolator and Upper Circuit Breaker Switch (40.5kV, 1250A)

High voltage rating of 40.5kV, 1250A current.
Modular design allows easy assembly and maintenance.
Robot-welded stainless steel ensures excellent airtightness.
Independent pressure relief channels enhance safety.
Compact, space-saving structure for efficient layouts.
Suitable for diverse industrial and utility applications.

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Product parameters

Model	Parameters
Rated voltage (kV)	40.5
Rated current (A)	1250
Rated frequency (Hz)	50
Rated short-circuit breaking current of circuit breaker（kA）	25/31.5
Rated short-circuit making current (peak)（kA）	50
Rated short-time withstand current duration（s）	4
Rated short-time withstand current（kA）	31.5
Rated peak withstand current (peak)（kA）	50
Rated short-time power frequency withstand voltage (Phase-to-Phase, Phase-to-Earth)（kV）	95
Rated short-duration power-frequency withstand voltage (across open contacts)（kV）	118
Lightning Impulse Withstand Voltage（kV）	185
Operation sequence	O-0.3s-CO-180s-CO
SF6 Charging Pressure (Gauge Pressure at 20°C) MPa	0.045
(N) Contact Force	200-300
Three-Phase Non-Simultaneous Contact Opening（ms）	≤2
Three-Phase Non-Simultaneous Contact Closing（ms）	≤2
Average Opening Speed（m/s）	1.4-2.0
Average Closing Speed（m/s）	1.0-1.8

Features

Modular Design: Supports flexible combination/expansion of units (no gas charging/discharging), adapts to high-voltage metering, and suits SF6 fully insulated ring main units/multi-circuit distribution cabinets.
Structural Safety: Armored structure with metal partitions; primary part of fully insulated structure reaches IP67 protection level.
Hermetic & Low-Consumption: 30-year gas tightness (no leakage); corrosion-resistant mechanism (self-lubricating bearings) enables maintenance-free operation, low energy consumption, high reliability, and long service life.
Expandable Busbar: Plug-in silicone connectors (full insulation/shielding) ensure stable conductivity; modular connection eases future capacity expansion.

This equipment, rated for 40.5kV / 1250A, operates under normal indoor conditions in accordance with IEC 62271-1 and GB3906.

Environmental Conditions:

Temperature: Maximum +40°C, 24-hour average +35°C, Minimum -40°C.

Humidity: Maximum 24-hour average relative humidity 95%, maximum monthly average 90%.

Altitude Limits:

The maximum installation altitude without reducing the SF₆ gas pressure is 1500 meters.

If the installation altitude exceeds 2500 meters, please contact pre-sales technical support.

Note: At altitudes of 1500 meters or above, reduced atmospheric pressure can cause the air compartment to bulge outward.

Special Conditions:

Operation must comply with the stated standards. For special or harsh operating environments, the end user must consult and reach an agreement with the manufacturer.

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