Three distinct views of the VQL-12 product. Confirm handedness, earthing-switch position and panel interfaces for the selected order.

12 kV series · Indoor switchgear

VQL-12G(D)Three-position vacuum circuit breaker

A side-mounted indoor breaker with isolating and earthing-switch functions for switchgear integration. Select the required current and breaking duty, then confirm the operating orientation and incoming-cable arrangement.

Rated voltage
12 kV
Rated current
630 / 1,250 A
Breaking current
20 / 25 / 31.5 kA, by model
Common breaking duties
25 or 31.5 kA
Operating sequence
O–0.3 s–CO–180 s–CO

Common VQL-12GD configurations use 25 or 31.5 kA duty. Confirm the complete current / breaking-duty pair and availability of a 20 kA assembly before ordering.

See all 32 technical parameters

Technical specifications.

Electrical and mechanical ratings for VQL-12G(D). Match the current, breaking duty and operating characteristics to the complete model code.

VQL-12G(D) technical specifications
No.ItemUnitValue
01Rated voltagekV12
02Rated short-duration power-frequency withstand voltage (phase-to-phase / across open gap)kV42 / 48
03Rated lightning impulse withstand voltage (phase-to-phase / across open gap)kV75 / 85
04Secondary-circuit power-frequency withstand voltageV2,000
05Rated frequencyHz50
06Rated currentA630 / 1,250
07Rated short-circuit breaking currentkA20 / 25 / 31.5
08Rated peak withstand currentkA50 / 63 / 80
09Rated short-circuit making currentkA50 / 63 / 80
10Rated short-time withstand current (4 s)kA20 / 25 / 31.5
11Rated short-circuit durations4
12Rated single / back-to-back capacitor-bank breaking currentA630 / 400
13Capacitor-bank inrush currentkA12.5 (frequency ≤ 1,000 Hz)
14Short-circuit current interruption countoperations30
15Endurance: isolating switch / circuit breaker / earthing switchoperations3,000 / 10,000 / 3,000
16Contact wear limitmm3
17Rated closing-coil voltageVAC/DC 24 / 48 / 110 / 220
18Rated tripping-coil voltageVAC/DC 24 / 48 / 110 / 220
19Spring-charging motor rated voltageVAC/DC 24 / 48 / 110 / 220
20Spring-charging motor rated powerW70 / 75 W — confirm ordered motor
21Spring-charging times≤ 15
22Contact gapmm9 ± 1
23Contact overtravelmm3.5 ± 0.5
24Contact closing bouncems≤ 2
25Three-phase closing / opening asynchronismms≤ 2
26Opening timems≤ 40
27Closing timems≤ 60
28Average opening speedm/s0.9–1.3
29Average closing speedm/s0.5–1.1
30Contact separation reboundmm≤ 2
31Contact closing pressureN2,400 ± 200 (20–25 kA); 3,100 ± 200 (31.5 kA)
32Rated operating sequence—O–0.3 s–CO–180 s–CO

Compare VQL-12GD/630-25, VQL-12GD/1250-25, VQL-12GD/630-31.5 and VQL-12GD/1250-31.5. Other current / breaking-duty combinations, including a 20 kA assembly, require model-specific confirmation before ordering.

Confirm the applicable 70 W or 75 W charging-motor value for the ordered assembly before specifying the operating supply.

VQL-12GD installation and control choices

Installation and control options.

Specify the switching arrangement, earthing function and control interface. Confirm the operating orientation against the cabinet layout.

  1. Selection

    Isolating and earthing switches

    Configuration options

    G identifies the isolating switch; D identifies the earthing switch. Specify whether the assembly requires an earthing switch.

    Confirm for your order

    Confirm the isolating and earthing interlocks and separate operating shafts against the cabinet schematic.

  2. Selection

    Operating orientation

    Configuration options

    Right-hand or reversed/left-hand arrangement. Confirm the viewing direction on the order drawing.

    Confirm for your order

    The earthing-switch side must not be the incoming side. For bottom cable entry with earthing, specify the reversed arrangement.

  3. Selection

    Control supply and contacts

    Configuration options

    AC/DC universal 110 V, 220 V or specified alternative; 220 V is noted as usual. Typical auxiliary contacts: breaker 5NO+5NC; charging, isolating and earthing switches each 1NO+1NC.

    Confirm for your order

    Confirm actual control voltage and required contact allocation on the order schematic.

  4. Selection

    Mechanism and options

    Configuration options

    Anti-pumping typically included; no lock and no overcurrent coil typically selected; live sensor typically included.

    Confirm for your order

    Specify the required anti-pumping, locking, overcurrent and voltage-indication devices on the approved order schematic.

  5. Selection

    Insulation and panel fit

    Configuration options

    Insulating cylinders or embedded poles; usual phase spacing is 210 mm. Confirm the 1,000 mm cabinet-depth reference for the selected assembly.

    Confirm for your order

    Confirm insulation option, cabinet interface, phase spacing and cable-entry direction against the approved drawing.

Confirm the complete side-mounted assembly, operating direction and selected accessories on the approved order drawing.

VQL-12 · Technical reference

Outline and installation dimensions.

Review the VQL-12 outline for preliminary switchgear layout. Confirm the selected arrangement, cabinet interface and clearances against the approved order drawing.

Side-mounted installation outline

VQL-12 outline and installation dimensions

Open manual at drawing
Front and side views with installation dimensions.Use for layout discussion; confirm installation dimensions against the approved order drawing.

Need a drawing for a specific configuration?

Request an order-specific VQL-12 drawing

Product manual and inspection report.

Open the product manual or request the inspection report for the sample listed below.

Available now

VQL-12 three-position vacuum circuit breaker manual

Operating instructions, configuration, technical parameters and outline dimensions.

Open manual

On request

VQL-12GD/1250-31.5 commissioned inspection report

Commissioned report 2113335394, dated 23 July 2021, covers six listed categories for one VQL-12GD/1250-31.5 sample: power-frequency withstand, lightning impulse, auxiliary-circuit insulation, partial discharge, circuit resistance and temperature rise. It does not provide short-circuit interruption or mechanical-endurance results.

Request sample report

See Liqiang manufacturing and inspection activities. Model reports and factory inspection records serve different purposes; match the required documents to the proposed equipment.

Price & quotation.

Configuration · VQL-12G/1250-25

VQL-12G/1250-25 three-station vacuum circuit breaker

Price reference for the specified VQL-12G/1250-25 configuration. The G configuration is quoted here. The GD earthing arrangement is quoted separately.

Rated voltage
12 kV
Rated current
1250 A
Short-circuit breaking current
25 kA
Quoted model
VQL-12G

Price range

USD 860–870 / set

USD per complete three-phase set. Minimum order: 1 set. USD 870 per set for 1–9 sets; USD 860 per set for 10+ sets. Shipping and taxes are excluded. Other configurations and accessories require a separate quotation. Confirm the specification and final quotation before ordering.

The range reflects order-quantity tiers for this configuration; it does not cover every option in the series.

Quantity pricing
Published quantity tiers for this configuration
Quantity (sets)Price per set
1–9USD 870
10+USD 860

VQL-12 · Product selection

Frequently asked questions.

Key checks for model combinations, installation, report scope and panel fit.

01Which VQL-12GD rating combinations are listed?

Four combinations are listed: VQL-12GD/630-25, VQL-12GD/1250-25, VQL-12GD/630-31.5 and VQL-12GD/1250-31.5. The specifications table also includes a 20 kA rating; confirm availability for combinations outside the four listed models. See the full specifications.

02Which operating orientation should I specify?

Choose right-hand or reversed/left-hand orientation to match your panel. With an earthing switch and bottom cable entry, use the reversed arrangement; do not use the earthing-switch side as the incoming side. Review the configuration checks.

03How should I specify the VQL-12GD control power supply?

State AC or DC and the required voltage for the closing coil, trip coil and spring-charging motor. Include auxiliary contacts, anti-pumping, locking and indication requirements. The control options provide the selection starting point; match each circuit and its supply requirements to the order schematic.

04Which interlocks should be included in a VQL-12GD panel specification?

Define the permitted relationships between breaker operation, isolation, earthing and cabinet access. Include position contacts, operating-shaft interfaces and any electrical locking required by the panel design. Match the interlocks and operating direction to the selected assembly in the installation and control options.

05Can I use the outline drawing as my final panel drawing?

Use the outline for preliminary layout only. Confirm operating orientation, cabinet interfaces and clearances against the approved order-specific drawing before panel release. See the VQL-12 outline.

Product engineering series

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Manufacturing and technical support.

Technical selection guide