LW9-72.5 Sf6 Circuit Breaker

Item:LW9-72.5 Sf6 Circuit Breaker
Excellent Arc Extinguishing Performance：
SF6 gas provides outstanding capabilities for extinguishing electrical arcs.
Compact and Simple Design：
The circuit breaker features a straightforward structure and a compact size for easy installation.
Effective Opening Performance：
It offers balanced operation with reliable opening performance.
Sealed Design with Low Noise：
The sealed construction minimizes operational noise.
Low Maintenance Requirements：
The circuit breaker has a reduced inspection and maintenance workload, making it user-friendly.

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Product Description

The advantages of the outdoor high LW9-72.5 SF6 circuit breaker:

Main Benefits:

Powerful Breaking Capability

The LW9-72.5 SF6 circuit breaker uses high-pressure gas to quickly extinguish electrical arcs, ensuring rapid and safe interruption of high currents. It effectively prevents the risk of re-ignition when switching off capacitive or inductive currents, making it reliable for medium and high voltage circuits.

Long-lasting and Durable

This circuit breaker has a long service life and requires less frequent maintenance. It is designed to handle frequent operations and can perform up to 19 consecutive interruptions at full capacity (50 kA), with a total breaking capacity of up to 4200 kA.

2、Long electrical life

Superior Insulation

SF6 gas provides excellent insulation, allowing the breaker to operate safely even under high pressure (0.3 MPa). It passes various insulation tests with ease, offering a strong level of protection against electrical faults.

Reliable Sealing and Low Maintenance

The breaker’s design ensures tight sealing of the gas compartments, keeping moisture out. Each part, including the interrupter chamber and resistor, is housed in its own gas compartment. This makes installation and maintenance simple without needing to open the internal components.

Model Description

Working Environment：

Item:LW9-72.5 Sf6 Circuit Breaker

Installation and Operating Conditions:

Mounting Options: Side-mounted or middle-mounted

Temperature Range:

Upper limit: +40°C

Lower limit: -30°C

Altitude: ≤2000m

(For higher altitudes, the rated insulation level must be increased)

Wind Resistance:

Max wind pressure: 700 Pa (equivalent to wind speeds of 34 m/s)

Seismic Resistance:

Earthquake intensity up to 8 degrees

Pollution Level: Class I

Max Daily Temperature Difference: No more than 25°C

Main Technical Parameters

Number	Parameter	Unit	Value
1	Rated voltage	kV	72.5
2	Rated current	A	2500/3150
3	Rated short-circuit breaking current	kA	31.5/40
4	Rated short-circuit making current (peak value)	kA	80
5	Rated short-time withstand current	kA	31.5/40
6	Rated short circuit duration	S	4
7	Rated peak withstand current (peak)	kA	80
8	Near zone fault breaking current	kA	31.5×75%
9	Rated out-of-step breaking current	kA	31.5×25%
10	first open pole coefficient		1.5
11	Opening time	S	≤0.03
12	Breaking time	S	≤0.06
13	Closing time	S	≤0.15
14	split time	S	≥0.3
15	united time	S	0.06
16	Weight of sulphur hexafluoride gas charged into circuit breaker	kg	3.5
17	Circuit breaker gross weight	kg	1000
18	Mechanical life	Second-rate	3000

Secondary Wiring Attention

Switch Interlocking

The electrical interlocking of the switch is achieved through the FK conversion, which also includes a reliable internal mechanical interlock. When manually opening the switch, do not forcefully pull the breaking latch if it resists. Similarly, if the closing latch won’t move, do not pull hard. Instead, check the pointer position before attempting to open or close the switch again.

Vacuum Pressure Gauge

The electrical contact vacuum pressure gauge leads are connected at the lower part of the cover, with the normally open contact leading out from the gauge. The lower limit pointer is preset at 0.2 MPa (or 0.25 MPa, considering -10°C). When the SF6 gas pressure drops to 0.2 MPa, the contact closes and connects to the relay protection circuit. Users can adjust the lower limit based on their operational needs, but it should not be set lower than 0.2 MPa.

Manual Operation Rings

The closing pull ring is located on the outer side of the box, while the breaking pull ring is inside. Be sure to use the correct ring during manual operation to avoid errors.

Power for Energy Storage Motor

The energy storage motor must be powered by AC electricity.