GW9 Single-Pole Outdoor High-Voltage Disconnector Thomas Electric

Product Overview

The GW9 is a single-pole outdoor high-voltage disconnector of AC 50 Hz for networks rated 10 kV, 15 kV and 24 kV. It opens and closes lines under no load and isolates live parts from busbars, circuit breakers and other equipment under maintenance, and it can make and break small capacitive or inductive currents. Each pole is an independent unit with two porcelain post insulators on a common steel base; three poles set side by side form the three-phase isolating switch. The series is designed to GB 1985, IEC 60129 and GB/T 11022; wall-bushing (C) and pollution-proof versions are available.

Product Display

GW9 Series Single-Pole Outdoor High-Voltage Disconnector, 10-24 kV - display

GW9 Series Single-Pole Outdoor High-Voltage Disconnector, 10-24 kV - poster_display

Model Designation

GW9 Series Single-Pole Outdoor High-Voltage Disconnector, 10-24 kV - model

Model format: G W9-12 (C)/□□

G — disconnector
W — place of use: outdoor
9 — design sequence number
12 — rated voltage, kV
(C) — wall-bushing type (omitted for the standard type)
□ — rated current, A
□ — rated short-circuit withstand current, kA

Service Conditions

Altitude: not exceeding 1000 m
Ambient air temperature: upper limit +40 ℃, lower limit −30 ℃ in general areas and −40 ℃ in cold areas
Wind pressure: not exceeding 700 Pa, equivalent to a wind speed of 34 m/s
No frequent or severe vibration at the installation site
Standard type: site free from gases, vapours, chemical deposits, salt mist, dust or other explosive or corrosive substances that seriously affect insulation and conductivity
Pollution-proof type: suitable for heavily polluted areas, without substances that may cause fire or explosion

Construction

Each pole is a single-pole unit on a 600 mm long, 87 mm wide steel base with four 16 × 24 mm mounting holes and an M10 earthing bolt, so poles can be transported, installed and maintained separately. Two porcelain post insulators on 405 ± 2 mm centres, each with 600 mm external creepage distance, support the live parts 245 mm above the base at a total height of 356 ± 1 mm.

The knife rotates onto the static contacts at the terminal blocks, and the open position provides the insulating gap that makes the isolated circuit visibly safe for personnel. The disconnector has no breaking capacity for load or short-circuit current and works in combination with a circuit breaker; the wall-bushing (C) version penetrates walls and panel partitions, the pollution-proof version serves heavily polluted areas, and mechanical life is 2000 operating cycles in every rated voltage group.

Technical Data

No.	Item	Unit	10 kV group	15 kV group	24 kV group
1	Rated voltage	kV	10	15	24
2	Rated operational voltage	kV	12	17.5	— (not tabulated)
3	1 min power-frequency withstand voltage, to earth (r.m.s.)	kV	42	55	65
4	1 min power-frequency withstand voltage, across the break	kV	48	65	79
5	Lightning impulse withstand voltage, to earth (peak)	kV	75	105	125
6	Lightning impulse withstand voltage, across the break (peak)	kV	85	120	145
7	Rated frequency	Hz	50	50	50
8	Rated current	A	200 / 400	630 / 1250	400 / 630
9	4 s short-time withstand current	kA	6.3 / 12.5	20 / 31.5	16 / 20
10	Rated peak withstand current	kA	16 / 31.5	50 / 80	40 / 50
11	Creepage distance	mm	300	380	— (not tabulated)
12	Mechanical life	operations	2000	2000	2000

Selection note: Match the rated voltage group — 10, 15 or 24 kV — to the network and check the insulation levels against the site. Select the rated current from the two tabulated steps of the group, verify the 4 s short-time and peak withstand currents, and choose the standard pole or the wall-bushing (C) version for the supporting structure. Order the pollution-proof version for heavily polluted or coastal sites, and confirm altitude, temperature range and wind pressure against the service conditions.

Standards

The GW9 series is designed to GB 1985 (high-voltage AC disconnectors and earthing switches), IEC 60129 (AC disconnectors and short-circuit making switches) and GB/T 11022 (common specifications for high-voltage switchgear and controlgear standards). The catalogue does not print a rated operational voltage or a creepage distance for the 24 kV group; these values, and the rated short-circuit withstand current of the ordered type, are confirmed by the technical agreement.

Technical note: Catalogue values are for selection guidance; the technical agreement and the equipment nameplate govern the final ratings of the shipped disconnector. Confirm the pairing of withstand ratings with the ordered voltage group and current step before installation.

Installation & Dimensions

Installation Diagram

GW9 Series Single-Pole Outdoor High-Voltage Disconnector, 10-24 kV - installation

Set the single poles side by side on the supporting structure at the specified phase spacing and fix each base through the four 16 × 24 mm holes on 560 ± 1 mm centres. Connect the M10 earthing bolt reliably, join the incoming and outgoing conductors to the terminal blocks, then check that the knife closes fully home and that the open position gives the tabulated insulating gap.

Outline dimension	Value (mm)
Base frame length	600
Base frame width	87
Base plate thickness	26
Distance from base end to insulator axis	100
Supporting insulator centres	405 ± 2
Mounting hole centres	560 ± 1
Mounting holes	4 × 16 × 24
Terminal height above base	245
Total height	356 ± 1
Insulator flange diameter	107
Earthing bolt	M10
Post insulator external creepage distance	600

Safety notice: The disconnector has no load or short-circuit breaking capability. Open the circuit breaker before operating the disconnector off, close the disconnector before the circuit breaker, and interlock the two devices so the disconnector cannot be operated under load. Earth the isolated section only after proving it dead.

FAQs

G marks the disconnector and W the outdoor place of use; 9 is the design sequence number and 12 the rated voltage in kV. C indicates the wall-bushing type, and the two final fields give the rated current in A and the rated short-circuit withstand current in kA.

No. It opens and closes lines under no load and makes or breaks only small capacitive or inductive currents. Load and short-circuit currents are interrupted by the associated circuit breaker, and the two devices must be interlocked so that the disconnector cannot be operated under load.

Three rated-voltage groups of 10, 15 and 24 kV are offered, each with two rated-current steps within the 200 A to 1250 A range. The 4 s short-time withstand current is tabulated from 6.3 kA to 31.5 kA and the rated peak withstand current from 16 kA to 80 kA.

It is the same single-pole disconnector supplied for penetration through a wall or a panel partition, so the live parts pass through the barrier while the base remains fixed to the structure. It saves a separate mounting frame where the switchgear is separated by a wall.

Altitude not exceeding 1000 m, ambient temperature from −30 ℃ (−40 ℃ in cold areas) to +40 ℃, wind pressure up to 700 Pa (34 m/s), and no frequent or severe vibration at the site. The standard type needs an atmosphere free of corrosive or explosive substances; the pollution-proof type suits heavily polluted areas.

The series is designed to GB 1985, IEC 60129 and GB/T 11022. When ordering, state the rated voltage group, rated current, rated short-circuit withstand current, standard or wall-bushing (C) type, standard or pollution-proof insulators and the number of poles; for higher voltage classes see the GW-15 outdoor disconnector.

GW9 Series Single-Pole Outdoor High-Voltage Disconnector, 10-24 kV