Medium-Voltage Vacuum Circuit Breakers

Reliable medium-voltage switching and protection: 5 kV and 15 kV class vacuum circuit breakers.

Wafr Medium-Voltage Vacuum Circuit Breakers provide reliable switching, fault interruption and protection for industrial, commercial, utility and infrastructure power-distribution systems.

The breakers use vacuum interruption technology with a stored-energy operating mechanism and are designed for installation in Wafr metal-clad switchgear or compatible medium-voltage switchgear assemblies.

Available configurations cover common Canadian 5 kV and 15 kV applications, including 4.16 kV, 12.47 kV, 13.2 kV and 13.8 kV systems.

Key Ratings

Parameter	Standard Ratings
Equipment class	5 kV / 15 kV
Typical system voltages	4.16 / 12.47 / 13.2 / 13.8 kV
Rated maximum voltage	4.76 / 15 kV
Frequency	60 Hz
Phases	3
Continuous current	630 / 1200 / 2000 / 3000 / 4000 A
Short-circuit interrupting rating	25 / 31.5 / 40 / 50 kA
15 kV-class BIL	95 kV
Interrupting medium	Vacuum
Configuration	Drawout
Operating mechanism	Stored-energy spring
Electrical operation	Local and remote
Typical control power	125 Vdc
Auxiliary contacts	Configurable
Mechanical interlocking	Standard
Electrical interlocking	Standard

Final breaker ratings are selected according to system voltage, continuous current, available fault current, protection requirements and switchgear configuration.

Available Configurations

Configuration

Drawout, with connected, test and disconnected positions

Operating Mechanism

Stored-energy spring

Operation

Electrically operated close and trip, local and remote

Interlocking

Positive mechanical and electrical interlocking as standard

Control Power

125 Vdc typical; configurable auxiliary contacts

Product Features

Key Features

Vacuum interruption for long electrical and mechanical life
Drawout construction for maintainability and isolation
Stored-energy spring operating mechanism
Electrically operated close and trip functions
Mechanical position indication
Connected, test and disconnected positions
Positive mechanical and electrical interlocking
Local and remote operation
Integration with numerical protection relays
SCADA and building-management-system integration
Low maintenance requirements
Suitable for frequent switching applications
Ground-and-test device provisions available
Canadian 60 Hz configuration

Protection & Control

Wafr circuit breakers can be integrated with modern numerical protective relays supporting ANSI protection functions including:

50 — Instantaneous Overcurrent
51 — Time Overcurrent
50N/51N — Ground Overcurrent
27 — Undervoltage
59 — Overvoltage
81 — Frequency
46 — Negative Sequence
49 — Thermal Protection
50BF — Breaker Failure

Additional protection functions are available according to the application.

Standards & Certification

Wafr Medium-Voltage Vacuum Circuit Breakers and associated switchgear configurations are certified and tested to applicable Canadian and North-American requirements, including:

CSA C22.2 No. 31 — Switchgear Assemblies
IEEE C37.04 — AC High-Voltage Circuit Breaker Rating Structure
IEEE C37.09 — Test Procedures for AC High-Voltage Circuit Breakers
IEEE C37.20.2 — Metal-Clad Switchgear
IEEE C37.20.6 — Ground and Test Devices, where applicable
CSA C22.1 — Canadian Electrical Code, Part I, for installation requirements

Applications

Utility distribution
Mining
Oil & gas
Data centres
Industrial facilities
Water and wastewater facilities
Commercial facilities
Hospitals and healthcare facilities
Universities and institutional facilities
Renewable-energy facilities
Battery energy-storage installations
Generator distribution and paralleling systems

Key Features

Vacuum interruption for long electrical and mechanical life
Drawout construction for maintainability and isolation
Stored-energy spring operating mechanism
Electrically operated close and trip functions
Mechanical position indication
Connected, test and disconnected positions
Positive mechanical and electrical interlocking
Local and remote operation
Integration with numerical protection relays
SCADA and building-management-system integration
Low maintenance requirements
Suitable for frequent switching applications
Ground-and-test device provisions available
Canadian 60 Hz configuration

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