Viper-ST is an independent pole operated (IPO) recloser
which combines the time-proven reliability of electronically
controlled, vacuum fault interrupters with the maintenancefree
benefits of a solid-dielectric insulated device. The IPO
feature offers user flexibility by permitting three distinct
mechanical operating modes.
• 1 phase trip / 1 phase lockout
• 1 phase trip / 3 phase lockout
• 3 phase trip / 3 phase lockout
The Viper-ST provides overcurrent protection for systems
through 38kV maximum, 800A continuous current and
16kA symmetrical interrupting up to 27kV and 12.5kA
symmetrical interrupting at 38kV.