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Outdoor Vacuum Circuit Breaker
Compare ZW32-12, ZW32-24 and ZW7-40.5 outdoor breakers by rated voltage, fault-interruption duty and installation interface. Start with the feeder study and the pole or bay drawing.
Outdoor vacuum circuit breakers
Compare the three breaker series
Compare voltage, current and fault-interruption duty for each complete model. Review installation and control requirements with its ratings.
Breaker models
3 seriesZW32-12 / OUTDOOR
ZW32-12 Outdoor Vacuum Circuit Breaker
12 kV outdoor feeder breaker. Specify fault duty, pole mounting and the control interface from the circuit drawing.
ZW32-24 / OUTDOOR
ZW32-24 Outdoor Vacuum Circuit Breaker
24 kV breaker with linked-post, operating-arm and red-mechanism configurations. Check current and breaking ratings together for the complete model.
ZW7-40.5 / OUTDOOR
ZW7-40.5 Outdoor Vacuum Circuit Breaker
40.5 kV breaker with enclosed-base, cabinet-base and open-frame configurations. Define the mounting and connection layout in the bay drawing.
Breaker details
Product details
Product overview
ZW32-12 is a 12 kV outdoor breaker rated 630 A and 20 kA. The grey three-pole assembly includes insulated poles, operating arms and a base.
Use the selected unit's data sheet and mounting drawing to confirm terminals, operating interface and site clearances.
ZW32-12 three-pole assembly
Image 1 of 2
ZW32-12 three-pole assembly2 images
Review pole spacing, terminal direction and mounting interfaces.
Series ratings
Specify current and breaking duty together under the complete model designation.
| Parameter | Rating |
|---|---|
| Rated voltage | 12 kV |
| Rated current | 630 A |
| Rated short-circuit breaking current | 20 kA |
Define the project duty
- Provide system voltage, rated current and calculated fault level.
- Share the pole or bay layout, terminal arrangement and clearances.
- State control supply, relay interface and required operating sequence.
- Confirm the complete model designation and selected-unit data sheet.
Product overview
ZW32-24 configurations include dark linked-post housings, grey posts with operating arms and a red-mechanism package.
Current and breaking ratings must be checked as a pair for the complete model designation.
Dark linked-post form
Image 1 of 2
Dark linked-post form2 images
Three dark linked-post housings above a grey mechanism base.
Grey operating-arm form2 images
Three grey insulated poles with visible operating arms.
Red-mechanism package1 image
Red central mechanism housing with a coiled control cable.
Series ratings
Specify current and breaking duty together under the complete model designation.
| Parameter | Rating |
|---|---|
| Rated voltage | 24 kV |
| Rated current options | 630 / 1250 A |
| Short-circuit breaking options | 20 / 25 kA |
Define the project duty
- Provide system voltage, rated current and calculated fault level.
- Share the pole or bay layout, terminal arrangement and clearances.
- State control supply, relay interface and required operating sequence.
- Confirm the complete model designation and selected-unit data sheet.
Product overview
ZW7-40.5 configurations use a light enclosed base, a rectangular cabinet base or an exposed open frame.
The current and breaking values are separate series options. Check the required pairing on the data sheet for the complete model designation.
Base and frame configurations
Configuration 1 of 3
Base and frame configurations3 images
Three tall red insulators with an enclosed base, cabinet base or open supporting frame.
Series ratings
Specify current and breaking duty together under the complete model designation.
| Parameter | Rating |
|---|---|
| Rated voltage | 40.5 kV |
| Rated current options | 1250 / 1600 / 2000 A |
| Short-circuit breaking options | 20 / 25 / 31.5 kA |
Define the project duty
- Provide system voltage, rated current and calculated fault level.
- Share the pole or bay layout, terminal arrangement and clearances.
- State control supply, relay interface and required operating sequence.
- Confirm the complete model designation and selected-unit data sheet.
Outdoor breaker forms
ZW32 and ZW7 arrangements
Compare insulated-pole assemblies, mechanism bases and supporting frames. Match primary connections, mounting dimensions and the control interface to the installation.
Outdoor breaker / 01ZW32-1212 kV seriesPole-mounted feeder position
Arrangement 01 / 03
ZW32-12
12 kV outdoor feeder breaker with three grey insulated poles, operating arms and a base assembly.
- Mounting interfaces
- Review support brackets, terminal direction and pole spacing in the mounting drawing.
- Site context
- For outdoor distribution lines, pole-mounted stations and substation feeders, define the installation position and protection duty on the project single-line diagram.
Outdoor breaker / 02ZW32-2424 kV seriesPole and mechanism configurations
Arrangement 02 / 03
ZW32-24
24 kV outdoor breaker with dark linked-post, grey operating-arm and red-mechanism configurations.
- Mounting interfaces
- Specify external insulation, support height and terminal geometry for the selected mechanism and pole assembly before preparing the mounting layout.
- Site context
- For outdoor distribution lines and pole-mounted or substation installations, coordinate control wiring and clearances with the selected arrangement.
Outdoor breaker / 03ZW7-40.540.5 kV seriesThree distinct base arrangements
Arrangement 03 / 03
ZW7-40.5
40.5 kV outdoor breaker with enclosed-base, cabinet-base and open-frame configurations.
- Mounting interfaces
- Define the base, supports and terminal locations in the installation drawing.
- Site context
- For outdoor feeders and transformer bays, coordinate bay spacing, switching sequence, protection and service access in the primary design.
Specification process
Specify an outdoor breaker for your circuit
Start with the circuit duty, then confirm a complete ZW32 or ZW7 rating, the control interface and the installation drawings.
From circuit brief to breaker proposal
- 01
Establish the circuit duty
State the voltage class, normal current, calculated short-circuit current and switching role at the circuit position.
- 02
Confirm the complete rating
Compare ZW32-12, ZW32-24 and ZW7-40.5 by voltage class; verify the current and breaking ratings together on the selected model’s data sheet.
- 03
Define protection and control
Set out trip and close commands, control supply, auxiliary signals and the protection scheme’s interface with the offered mechanism.
- 04
Review mounting and documents
Check terminal geometry, supports, clearances and control wiring on the proposed drawings; list the required data sheet and test records.
The agreed circuit duty and configuration drawings provide a basis for assessing the proposed breaker.
Series comparison
Compare ZW32 and ZW7 breaker series
Select the voltage class, then confirm the current and breaking ratings together for the complete model. Match the selected configuration to its installation drawing.
| Review point | ZW32-12 | ZW32-24 | ZW7-40.5 |
|---|---|---|---|
| Rated voltage | 12 kV | 24 kV | 40.5 kV |
| Rated current options | 630 A | 630 or 1250 A | 1250, 1600 or 2000 A |
| Short-circuit breaking options | 20 kA | 20 or 25 kA | 20, 25 or 31.5 kA |
| Configurations | Grey three-pole assemblies with operating arms. | Dark linked-post, grey operating-arm and red-mechanism forms. | Enclosed cabinet-base and exposed open-frame examples. |
| Installation drawing | Check support points, pole spacing, terminal positions and operating-arm clearance. | Match the selected mechanism package, terminal arrangement and support points. | Match the selected cabinet or frame, mounting base and primary connection clearances. |
Quotation information
Information for an outdoor breaker quotation
Provide the circuit duty, control scheme and installation drawing together. Identify fixed ratings and any configuration decisions still open.
Useful project files
A single-line diagram, protection schedule, control drawing and pole or frame layout help define the breaker package. For replacement work, include the existing nameplate and connection measurements.
Application context
Outdoor breaker installation contexts
Review pole, frame and replacement interfaces together with the selected breaker ratings and protection scheme.
01Pole installation interfaces
EquipmentSelected breaker
SupportPole mounting
ProtectionRelay interface
Mounting and control interfaces follow the project drawings
Pole feeder installations
A pole-mounted feeder installation needs the breaker, support and protection interfaces defined together.
Design considerations
Check conductor approach, support dimensions, terminal clearances and operating access. Specify the operating supply and relay or controller interface required by the network.
02Outdoor bay interfaces
EquipmentRated breaker
ConnectionsFrame and terminals
AccessOperating space
Support geometry depends on the selected breaker configuration
Outdoor frames and bays
A breaker selected for an outdoor bay must fit its supporting frame, primary connections and operating access.
Design considerations
Review base dimensions, phase spacing, cable or bus connections, service space and site conditions. Confirm the control wiring against the selected mechanism package.
03Existing equipment interfaces
IdentityExisting nameplate
FitMounts and terminals
ControlsControl drawing
Replacement fit requires rated-data and drawing review
Replacing an outdoor breaker
Confirm a replacement against the existing nameplate, installation measurements and control drawing before choosing the complete model.
Design considerations
Provide mounting centers, terminal positions, operating supply, relay inputs and auxiliary-contact requirements. Confirm current and breaking duty for the exact model designation.
Selection questions
Questions about outdoor breakers
Ratings, control interfaces and installation details to confirm for the quoted breaker package.
How do I shortlist ZW32-12, ZW32-24 and ZW7-40.5?
Start with the system voltage and required circuit duty. Confirm continuous current, breaking and withstand requirements together for the complete model, then review its insulation, installation and control interfaces.
Can any listed current and breaking options be combined?
Select continuous-current and breaking-duty ratings together for the complete breaker model. Use a combination confirmed by that model’s rated-data sheet.
Which control and protection equipment belongs in the package?
State the relay or controller, sensing inputs, operating supply, commands and auxiliary-contact requirements. Define the quoted controls, supports and accessories separately from equipment supplied by others.
How do the breaker configurations differ?
ZW32-24 configurations differ in pole housings and operating mechanisms. ZW7-40.5 arrangements use an enclosed base, a cabinet base or an open frame. Select the mechanism, primary connections and support layout with the required model rating.
What is needed to check a replacement breaker?
Provide the existing nameplate, mounting dimensions, phase spacing, terminal positions, operating supply and control drawing. Replacement compatibility depends on mounting, primary terminals and control wiring as well as the electrical ratings.
Which documents help prepare a quotation?
Send the single-line diagram, duty and protection schedule, pole or frame layout, control requirements and quantity. Identify the supply boundary and the data sheets, drawings and test records needed for project review.