Not all capacitor switch manufacturers share Maysteel's conservative approach to vacuum switch construction and testing —
which assures reliable operation even in the most severe conditions. Following is a side-by-side comparison with one of the
industry's most popular vacuum switches:
VS SERIES FEATURE MAYSTEEL BRAND X MAYSTEEL ADVANTAGE
Vacuum Bottle Gap 0.375" 0.1875" The size of the gap between the contacts within the
bottle is important. The larger gap increases dielectric
strength, providing higher BIL capability and restrike-
free operation at higher voltages.
Vacuum Bottle Volume 16 cu.in. 12 cu.in. Smaller volume increases tendency of switch to restrike.
Likelihood of Destructive Low High Restriking of the switch contacts causes overvoltage
Switch Restriking stress on the capacitors and other components
connected to the capacitor bank, as well as the switch
insulation. Repeated restriking causes premature
failure of these devices.
ANSI Single-Phase Test Yes No Maysteel tests to ANSI single-phase standards. Brand
X tests to less-stringent three-phase standards. Single-
phase standards require test voltage of 1.20 times the
rated voltage; three-phase requires only 0.87 times the
rated voltage.
Certified Single-Phase Yes No Certified test results at ANSI-specified maximum
Test Results Available voltage and in-rush current are the best assurance of
dependable performance in your application.
High Frequency 12 kA 6 kA In the event of back-to-back switching (see ANSI
Transient-Making C37.66), the Trinetics switch is capable of withstanding
Current (Peak) 12,000 amps in-rush, versus 6,000 amps for Brand X.
Vacuum Bottle Type Cutler-Hammer Special Field-proven Cutler-Hammer technology.
Primary Cable Standard V Special Standard V bushing configuration eliminates risk of
Connections improper orientation of cables in installation. Brand X
switches require special installation procedures.
Operating Mechanism Electric Motor Solenoid Electric motor provides dependable operation and draws
much lower current (3 amps) than solenoid (12 amps).
Manual Trip and Close Yes Trip-Option Cost savings. Eliminates need for upgrade. Provides
Close-No
ability to close the switch when control voltage is not
available. ANSI C37.66 requires distribution capacitor
switches to have manual trip and manual close.
Manual Rating Same As De-Rated Maysteel provides no performance loss in
Electrical manual operation.
Animal Protectors Yes Option Cost savings. Eliminates need for upgrade.
Ability to Rotate Bushings Yes No Provides mounting flexibility on capacitor banks.
MAYSTEEL Electric Utility Products & Enclosures N90 W14507 Commerce Drive • Menomonee Falls, WI 53052-1240 • 877/219-9728 • 262/251-0069 Fax
www.maysteel.com
SS108-1/02
Trinetics
™
Vacuum-Type Capacitor Switches
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