MV Distribution

Switchgear - Metalclad Switchgear

Masterclad® Metalclad Switchgear

Metalclad medium voltage switchgear is used in a wide variety of switching, control and protective applications for data centers. In Tier III and IV systems it's mainly used for the main incoming service equipment and the generator paralleling gear. Auto transfer schemes allow Metalclad breakers to seamlessly switch between utility sources and paralleling gear during scheduled or uncontrolled power outages.

Metalclad switchgear is also used for the primary disconnect on the 12.47kV to 480V transformers. This allows users to electrically transfer between the A and B sources without the use of generators. This is also important for isolating cable faults that may occur while in operation.Significantly, most of the Masterclad switchgear specified for these applications is relied upon to provide the critical main service entrance protection and controls.

This class of switchgear protects transformers, generators and feeder circuits.

    The Reliability of a Quality Design

    Square D switchgear is used in a variety of switching, control and protective applications. This class of equipment protects transformers, motors, generators, distribution lines and feeder circuits. Most of the Masterclad switchgear applications are relied upon to provide the critical main service entrance protection and control.

    Exclusive Performance Features

    Masterclad switchgear is available in voltages from 4.76kV to 27kV and current ranges from 1200A-3000A. Standardization of the design incorporates a series of basic modular units, control packages, and instrumentation. For most ratings one basic size unit is used. These features provide application flexibility, versatility, efficiency and economy in engineering time to plan and lay out the switchgear.

    Time and Cost Savings Benefits

    • Maintenance requirements are minimized with the use of enclosed long-life vacuum interrupters for the VR circuit breaker.
    • When maintenance or inspection is required, the drawout circuit breakers and instrument drawers allow easy access.
    • The inherent rigidity and mechanical strength of the circuit breaker design complement the operating mechanism, resulting in high endurance and reliability.

    Available Enhancements

    • Arc-resistant switchgear in type A-B-C construction per EEMAC. This switchgear is designed to meet the requirements for internal arcing protection.
    • Additional degree of protection from damaging open arcing faults with our Arc Terminator arc extinguishing system.
    Benefits
    • Long life and minimum maintenance - Vacuum interrupter design is capable of 20 to 100 full fault operations (varies by ratings).
    • Total fault clearing time is 3 cycles. This is the fastest in the industry and reduces voltage sags on the system.
    • Safety barriers and interlocks - Full compartmentalization is supplied with primary functions separated by grounded metal barriers. All bussing is insulated and live parts are not exposed.
    • Safety interlocks work with the breaker racking system. These protective features provide safety for operating personnel.
    • Breakers can withstand various levels of commissioning which involves many switching operations.
    Data Center Applications
    • Main service switchgear
    • Paralleling switchgear
    Ratings
    • 4.76 - 15kV (to 13.8kV nominal)
    • 1200A - 3000A
    • 250 - 1000 MVA interrupting capacity
    • 60 and 95kV BIL
    • Indoor and outdoor enclosures
    Standard Features (as defined by ANSI C37.20.2) includes:
    • Removable (drawout) circuit breaker
    • Fully compartmented construction
    • Grounded metal barriers
    • Enclose all live parts
    • Automatic shutters
    • Insulated bus
    • Mechanical interlocks
    • Disconnect type voltage transformers - CPT and VTs
    • Grounded breaker truck in and between test/disconnected and connected positions
    • Low voltage instrument/control compartment isolated from primary voltage areas

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    Spotlight:

    A geartalk Presentation of the
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    		 Learn More:

    Download the Masterclad Metalclad Switchgear brochure.

    Visit the METALCLAD switchgear product page.