LW9-72.5 outdoor high voltage porcelain SF6 circuit breaker is an outdoor, three-phase AC 50Hz high voltage electrical equipment. It is primarily used to protect transmission and distribution lines and can also be used as a tie breaker. This circuit breaker features a three-phase mounted on one frame, with no provision for single-phase operation.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	72.5
2	Rated Frequency	Hz	50
3	Rated Current	A	3150/4000
4	Rated Short-Circuit Breaking Current	kA	31.5
5	Rated Short-Circuit Making Current (Peak)	kA	80
6	Rated Peak Withstand Current	kA	80
7	Rated Duration of Short-Circuit	s	4
8	Rated Power Frequency Withstand Voltage (Dry Test)	kV	160+42(Across the contact gaps) / 160(To Ground)
9	Creepage Distance Ratio	CM/kV	3.1
10	Rated Power Frequency Withstand Voltage (Wet Test)	kV	160+42(Across the contact gaps) / 160(To Ground)
11	Rated Lightning Impulse Withstand Voltage	kV	410(Across the contact gaps) / 350(To Ground)
12	5-Minute Power Frequency Withstand Voltage	kV	1.3×72.5√3
13	Closing Time	ms	≤150
14	Opening Time	ms	≤30
15	Breaking Time	ms	≤60
16	Making Time	ms	40-60
17	No-Simultaneity of Opening Operations of 3-Phase	ms	≤2
18	No-Simultaneity of Closing Operations of 3-Phase	kA	≤4
19	Rated Reclosing Operation		O-0.3s-CO-180s-CO
20	Rated SF6 Gas Pressure	MPa	0.5, 0.4
21	SF6 Gas Alarm/Locking Pressure	MPa	0.45/0.40, 0.35/0.3
22	SF6 Gas Annual Leakage Rate	%	≤0.5
23	Number of Interrupting Chambers per Pole		1
24	Mechanical Endurance	Times	3000
25	Terminal Horizontal Longitudinal Pulling Force	N	790
26	Terminal Horizontal Transverse Pulling Force	N	750
27	Terminal Vertical Pulling Force	N	750
28	Main Circuit Resistance		≤50
29	Operating Mechanism		Spring Mechanism
30	SF6 Gas Filling Mass	Kg

Operating Environment

Average Monthly Humidity: ≤90%

Maximum Wind Speed: ≤35 meters/second

Pollution Level: Class III, IV

Ambient Temperature: -35°C to 40°C

Maximum Daily Temperature Variation: 25K

Seismic Intensity: 8 degrees

Maximum Ice Thickness: 10mm

Maximum Solar Radiation Intensity: 1000W/m²

Standard Compliance: GB/T1984-2014

Product Advantages

LW9-72.5 Outdoor High Voltage Porcelain SF6 Circuit Breaker has many advantages:

Superior Breaking Capability:

When interrupting magnetizing current, the overvoltage is less than twice the operating voltage. Additionally, when interrupting charging current, there is no re-striking or re-ignition occurs.

Reliable Insulation:

The properties of SF6 gas remain stable over time, protecting the insulating and conductive components from oxidation and ensuring stable temperature operation.

Minimal Maintenance:

The circuit breaker features a modular structure with advanced technology, reduced components, and excellent mechanical performance, and requires almost no maintenance.

Product Applications

LW9-72.5 Outdoor High Voltage Porcelain SF6 Circuit Breaker has many applications:

Transmission and distribution lines

AS a tie breaker.