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Viper-S® Solid Dielectric, Three Phase Reclosers

Viper®-S Solid Dielectric Three Phase Reclosers 



Fault interrupting through 38kV, 800A, 12.5kA symmetrical interrupting. G&W's Viper-S® solid dielectric, three phase recloser combines the time proven reliability of electronically controlled, vacuum fault interrupters with the maintenance benefits of a solid dielectric insulated device. The reclosers are designed for three phase automatic or manual trip operation providing overcurrent protection for systems rated up to 38kV maximum, 800A continuous, and 12.5kA rms symmetrical interrupting.

  • Reliable performance - Viper-S reclosers utilize G&W's time proven epoxy polymer system to fully encapsulate the vacuum interrupters. This system provides excellent insulation properties while providing fully shielded, void-free construction.
  • Control Flexibility — Viper reclosers are designed to work directly with the popular, field proven SEL-351R control. Other controls are available depending on application requirements.
  • Ease of Installation - The Viper-S is lightweight and compact. Site-ready designs provide all accessories including bracket, arresters and voltage transformers preassembled prior to shipment significantly reducing installation time.
  • Smart Grid / Lazer Automation Solutions - The Viper-S is automation ready, simplifying conversion for any future automation requirements. A multi-ratio current transformer is encapsulated within the module.
  • Manual Trip Operation - For manual open and lockout operation, a handle is provided permitting hookstick operation. Pulling the handle down trips and locks out the recloser.

Polemount Center Bracket

Polemount Horizontal Side Bracket

Dimensions are approximate. Do not use for construction. Galvanized brackets are standard. Stainless steel is available.

Polemount Site-Ready Assembly

Preassembly of all auxiliary equipment significantly reduces recloser preparation time for product installation in the field. Includes potential transformers or voltage transformers, arresters, aerial lugs, terminal/junction boxes, wildlife protectors and all associated wiring. Control cables are connectorized on both ends and cut to length for a cleaner installation. User identification markers can be applied to each unit prior to shipment further reducing installation time.

Substation Mount Recloser

Frames are adjustable. Standard frames are galvanized. Stainless steel is available. Custom frames available including conversion for direct replacement of existing reclosers. Dead-tank construction makes it ideal for substation circuit breaker applications and ensures the shielded solid dielectric module is grounded to earth potential.

For applications where extended creepage is required, larger insulators can be applied up to 940mm and 150kV BIL. External bushing CTs can be mounted at the base of the insulator where they can be used for metering or relay protection schemes like bus differential. The mechanism housing for substation applications is rated IP46 for maximum protection from water intrusion.


Padmount Recloser

For applications where space is limited at the substation or where underground feeders require protection, Viper-S solid dielectric reclosers can provide an ideal solution using a dead-front padmount design. In this configuration, the cable connections can be provided with either a standard IEEE apparatus or deepwell bushing for elbow connectors. Different style modules permit either all front access or front/back access to cable connections and operators depending on user preference. Controls can be mounted directly to the recloser frame or within a separate adjacent enclosure.


Electrical Ratings:
Maximum Design Voltage, kV 
Impulse level (BIL), kV
Continuous & load break current, A
8-hour Overload, A rms
60Hz Withstand, kV rms
  One minute (dry)
  10 second (wet)



Radio Influence Voltage, microvolts 100 @
Interrupting Current, kA rms sym.
Making Current, kA asym. rms
Making Current, kA asym. peak
Short Circuit Current, kA sym., 3 second
Mechanical endurance, operations


Control Connections - The traditional 14-pin recloser control connector design is the same as other Cooper reclosers permitting easy change out of previously installed controls and/or reclosers.

Control Capabilities - Various style controls are available depending upon application requirements. Typical control settings include:
• Minimum trip for phase, ground and sensitive ground faults.
• Numerous pre-programmed and user-defined time current curves for sensing phase or ground faults.
• Three independent recloser interval times. Capable of up to four shots to lockout.
• Reset time.
• Sequence coordination.
• Cold load pickup.
• Advanced parameters. Refer to control specifications for more details.

Control Power Viper-S - Many of today’s reclosers require two to three cables between the control and the recloser to provide AC power to the recloser, control signals and commands, and in many cases, deadline operation. Now there is a cleaner, more efficient way to do the same tasks using G&W’s Control Power Viper-S. The Control Power Viper-S provides a single cable solution for all current, control, breaker status, and auxiliary power to operate the Viper-S. This package uses the power from the control to operate the Viper-S through a four-shot sequence. The power in the recloser control is backed up by batteries and provides an excellent solution for applications requiring deadline operation. The Control Power Viper-S paired with the SEL-651R provides deadline operation which the 14-pin connector cannot provide. The Control Power Viper-S provides a more economical solution compared to the traditional SEL-651R 14-pin configuration. This is accomplished by utilizing the SEL-651R power source to drive the Viper-S magnetic actuator and eliminate the AC/DC power supply within the Viper-S. The Control Power Viper-S has less electronics in the recloser than traditional 14-pin reclosers on the market today.

Drawings (Click Image to Enlarge)



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