FW-630A

Pole-mounted SF6 load break switch

SF6-insulated pole-mounted load break switch for 12/24/40.5 kV overhead distribution lines, switching load and overload currents and able to automatically sectionalise a faulted line section. Manual, motor and remote operation via an electronic controller.

Key parameters

Rated voltage: 12 / 24 / 40.5 kV
Rated current: 630 A
Short-time withstand current: 20 kA / 1 s
Insulating and arc-quenching medium: SF6 gas
Degree of protection: IP65

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General information

The FW-630A pole-mounted load break switch is designed for distribution networks with a rated voltage of 12/22/40.5 kV, rated current of 630 A and frequency of 50/60 Hz — for making and breaking load and overload currents. It can automatically isolate a faulted section of a distribution line.

The switch is equipped with a state-of-the-art electronic controller and supports manual, motor-operated and remote control. The controller is housed in a stainless steel cabinet, making it suitable for operation in a wide range of climatic conditions. In addition, a wired or wireless modem can be installed in the cabinet for remote monitoring and control. Simple pole mounting is quick and convenient and reduces construction costs.

Type designation

FW-24/630 x x

FW	Product name: outdoor SF6 load break switch
24	Rated voltage, kV
630	Rated current, A
x	Derived version: L — cable outlet, B — with surge arrester
x	Operating mechanism type: M — manual, A — motor-operated, Z — automatic

Service conditions

The SF6 load break switch is designed for operation under the following conditions:

Ambient air temperature: upper limit +50 °C, lower limit −40 °C.
Relative humidity: 110 %.
Altitude: not more than 3000 m.
Wind pressure: not more than 700 Pa (corresponds to a wind speed of 34 m/s).
Seismic intensity: 8 degrees.
Pollution degree: III, IV.
Installation site: free from fire and explosion hazards, chemical corrosion and frequent severe vibration.

Features

SF6 insulation. SF6 is a non-toxic, non-flammable insulating gas with excellent arc-quenching properties.
Variety of bushings. In addition to standard porcelain bushings, various options are available, including rubber insulators on bushings of epoxy equipment.
Visible ON / OFF status. A coloured indicator of the main contact position (green — OFF, red — ON) is clearly visible from the ground. The indicator is directly connected to the main contact drive shaft, which guarantees accurate indication of their status.
Fast operation. The spring-charged stored-energy operating mechanism ensures fast closing and opening (less than 1000 ms).
Local and remote control. Thanks to the electronic controller, the switch can be operated locally or from a control centre via an FTU/RTU interface.
Robust and durable design. The switch is made of proven, strong, corrosion-resistant materials (marine-grade 304L stainless steel), ensuring a long service life (30 years) and a large number of operations — ideal characteristics for pole-mounted equipment.
Compliance with standards. Each switch is factory-filled with SF6 gas, sealed and tested in accordance with IEC 60265-1 (1988).

Appearance and overall dimensions

Voltage class	Overall dimensions, mm				Package dimensions, mm	Weight, kg
Voltage class	A	B	C	D	L × W × H	Weight, kg
12 kV	225	500	803	1056	1100×900×700	105
24 kV	300	650	953	1250	1300×1100×700	145
40.5 kV	400	850	1153	1380	1400×1200×700	165

Ratings

Parameter	12 kV	24 kV	40.5 kV
Main ratings
Rated (highest) system voltage	12 kV	24 kV	40.5 kV
Rated continuous current	630 A	630 A	630 A
Rated frequency	50/60 Hz	50/60 Hz	50/60 Hz
Short-time withstand current	20 kA / 1 s	20 kA / 1 s	20 kA / 1 s
Switching capacity
Rated mainly active load breaking current	630 A	630 A	630 A
Number of load breaking operations	400 operations	400 operations	400 operations
Short-circuit making current (peak value)	50 kA	50 kA	50 kA
Number of short-circuit making test operations	5 operations	5 operations	5 operations
Cable-charging breaking current	25 A	25 A	25 A
Line-charging breaking current	1.5 A	1.5 A	1.5 A
Rated closed-loop breaking current	630 A	630 A	630 A
No-load transformer breaking current (magnetizing current)	22 A	22 A	22 A
Power-frequency withstand voltage test
Wet test, 10 s: phase-to-phase, phase-to-earth, across open contacts	38 kV	50 kV	70 kV
Dry test, 1 min: phase-to-phase, phase-to-earth	42 kV	65 kV	95 kV
Dry test, 1 min: across open contacts	48 kV	79 kV	110 kV
Lightning impulse withstand voltage test (1.2/50 µs)
Phase-to-phase, phase-to-earth	75 kV	125 kV	195 kV
Across open contacts	85 kV	145 kV	215 kV
Other technical parameters
Internal arc withstand test	20 kA / 0.1 s	20 kA / 0.1 s	20 kA / 0.1 s
Arc-quenching medium	SF6 gas	SF6 gas	SF6 gas
Insulating medium	SF6 gas	SF6 gas	SF6 gas
Creepage distance (porcelain bushings)	380 mm	700 mm	1055 mm
Creepage distance (silicone bushings)	540 mm	700 mm	1055 mm
Minimum air clearance	≥ 200 mm	≥	≥
Degree of protection	IP65	IP65	IP65
Mechanical characteristics
Closing / opening time	< 1 s	< 1 s	< 1 s
Mechanical endurance (guaranteed)	10000 operations	10000 operations	10000 operations
Operating temperature (*for manually operated version)	−25…+70 °C	−25…+70 °C	−25…+70 °C
Gas pressure
Rated operating pressure (MPa, at 20 °C)	0.07	0.07	0.07
Pressure relief device operating pressure (MPa)	0.1…0.6	0.1…0.6	0.1…0.6
Minimum operating pressure (MPa)	0.02	0.02	0.02
Gas leakage (cm³/s)	≤ 0.5 %	≤ 0.5 %	≤ 0.5 %

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