Viper®-S Solid Dielectric Three Phase Recloser

G&W Electric’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. This recloser is designed with a mechanically ganged operator 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.

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Features and Benefits

Configuration Details

  • Polemount Center Bracket
  • Polemount Alley-arm Bracket
  • Polemount Complete Site-Ready Assembly
  • Substation Mount Recloser
  • Padmount
Electrical Ratings Chart for Viper®-S
Maximum Design Voltage, kV 15.52738
Impulse level (BIL), kV110125150
Continuous & load break current, A800800800
8-hour Overload, A rms at 20°C960960960
60Hz Withstand, kV rms
- - - One minute (dry)506070
- - - 10 second (wet)455060
Radio Influence Voltage, microvolts 100 @9.4kV16.4kV23kV
Interrupting Current, kA rms sym.12.512.512.5
Making Current, kA asym. rms202020
Making Current, kA asym. peak323232
Short Circuit Current, kA sym., 3 second12.512.512.5
Mechanical endurance, operations10,00010,00010,000
Temperature range-60°C to +65°C-60°C to +65°C-60°C to +65°C
Continuous Current800A*800A*
*Consult factory for higher continuous current up to 1000A


High Accuracy Sensors – Accusense Voltage Sensors

Controls – The Viper-S works directly with a variety of popular controls.

SEL-351R Recloser control

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.


The SEL-651RA is a direct replacement of the SEL-351R with a 14 pin interface and offers exceptional protection and communications capabilities for Automatic Network Reconfiguration and other distribution automation needs. These capabilities help you maintain reliable service to as many customers as possible in the event of a fault.


  • Six voltage inputs support measurements on both sides of the recloser for advanced distribution automation and monitoring
  • Comprehensive communications protocols and interfaces ease integration into distribution automation systems

Beckwith M-7679

Beckwith’s M-7679 R-PAC Next generation Protection, Automation and Control System for Recloser, Switch, Sectionalizer and Distribution Automation Applications.


  • Over 30 Protection Elements for optimal protection of Power Distribution Systems
  • Compatible with Three Phase (Standard) and Independent Phase capable Reclosers, Switches and Sectionalizers (Optional)
  • Four (Standard) or Six (Optional) Low Energy Analog (LEA) or VT voltage inputs
  • Settings Wizard assists in creating file for most common settings
  • Recloser Status Monitoring tool displays real time reclosing sequence and fault clearing time
  • Comprehensive I/O Matrix provides visual confirmation of enabled functions and selected outputs improving security
  • Embedded Cyber Security including:
    • Role Based Security
    • Complex passwords
    • Individual user accounts with activity log
    • IPSec (VPN) Tunnel
    • Compatible with Radius password management systems
  • PQ Monitoring


  • 3500 Sequence of Event Records
  • 100 Oscillographic Records (Up to 128 s/c & 480 Cycles each)
  • Over 2 years of data logging (at 5 min interval, adjustable)

GE Multilin R650 (IEC Configured)

The GE Multilin® R650 Recloser Control is a member of GE’s Multilin 650 family of field-proven protection and control devices, allowing customers to use the same platform both inside and outside the substation. This recloser controller delivers comprehensive performance in protection, monitoring, control, automatic network configuration and communications. With high speed, reliable performance this solution works to reduce customer outages and ensure fast recovery of medium voltage network sections for increased reliability of secondary distribution systems.


  • Protection and control- up to 32 programmable digital inputs; 16 digital outputs configurable PLC logic to IEC 61131-3
  • Advanced real-time monitoring, metering, and measurement
  • Enhanced user interface display with 16×40 graphics or standard 4×20 characters
  • Communication Protocols: DNP 3.0, IEC 61850 ed. 2, IEC 60870-5-101, 103 & 104, etc.
  • Optional fiber optic 100BaseFX Ethernet, single or redundant (PRP/HSR/RSTP)
  • Compact Case Size
  • Optional conformal coating for harsh environments
  • Extends the use of GE relays outside the substation for existing GE customers
  • Links with G&W Electric LaZer Distribution Auto
Product Literature

Viper®-S Solid Dielectric, Three Phase Recloser Brochure – English


Viper®-S and Viper®-ST Padmount


Low Fault Current Detection



Case Studies

Overhead Automatic Transfer with Overcurrent Protection


Renewable Intertie w Padmount Viper Reclosers


Substation Circuit Breaker Retrofit w Recloser


Low Profile Recloser Solves Clearance Issue


Three Phase Protection in Confined Spaces

Application Guides

Viper®-S Flyer


Viper®-S Specification

White Papers

Fire Mitigation Strategies for Distribution

Unlock Resource
Technical Guides

Clearing Time for Viper-S


Interconnection Between DER & Utility System