ABB · THOMAS & BETTS · AUTHORISED DISTRIBUTOR
High-voltage switching solutions for utility & industrial power systems
With roots dating to the 1919 founding of the Hi-Voltage Equipment Company in Cleveland, Ohio, Joslyn Hi-Voltage has delivered over 105 years of proven switching excellence. Now part of ABB Installation Products and manufactured 100% in Hackettstown, New Jersey, Joslyn offers a complete portfolio of air break switches, capacitor switches, vacuum switches, and electric air furnace switches — engineered for utility substations and industrial power applications from 15kV through 230kV.
100% manufactured in the USA — Hackettstown, New Jersey
Years Of Expertise
15–230kv
Voltage Range
Covered
100,000+
Versavac
Operations
USA
100% American Made
High-voltage switching solutions for utility & industrial power systems
VerSaVac™ — Maintenance-Free Vacuum Switching
A completely sealed vacuum switch delivering 100,000+ operations (50,000 open/close cycles) with virtually no maintenance. Traditional capacitor switches require regular oil changes and component replacements. VerSaVac eliminates these with sealed vacuum interruption, solid dielectric insulation, no exposed live parts, and optional Zero Voltage Closing (ZVC) for transient mitigation — the longest operational life of any distribution capacitor switch.
100,000+
Operations — no maintenance
No oil
No gas — sealed vacuum
15–230Kv
Application voltage range
TOP FEATURES
Zero maintenance design
VerSaVac sealed vacuum technology eliminates oil changes, component replacements, and routine servicing — dramatically reducing lifecycle costs and operational downtime.
Enhanced personnel safety
Completely sealed designs with no exposed live parts and solid dielectric insulation protect utility personnel during operation, switching, and maintenance activities.
Zero Voltage Closing (ZVC)
Optional ZVC control mitigates system over-voltages and inrush current transients — protecting capacitor banks and extending their operational lifespan significantly.
Vacstat™ health monitoring
Optional Vacstat vacuum interrupter monitor tracks switch health in real time — enabling proactive maintenance planning and preventing unexpected failures.
Complete voltage coverage
Full portfolio covering 15kV through 230kV — distribution, sub-transmission, and transmission voltage classes all served by a single trusted brand and manufacturer.
Environmentally clean
No oil or gas in vacuum technology — eliminating contamination risks, environmental liability, and the hazardous waste disposal costs associated with oil-filled switchgear.
SOLUTIONS BY INDUSTRY
Electric utilities
Substation capacitor bank switching, voltage regulation, and distribution automation for electric utilities requiring maximum reliability and minimum maintenance over decades of service.
Renewable energy
High-voltage switching for solar generation substations and wind farm collector systems — where power quality and reliable reactive compensation are critical to grid interconnection.
Industrial power systems
Heavy industrial facilities requiring high-voltage switching for power factor correction, reactive power control, and dedicated electric arc furnace supply switching applications.
Electric arc furnaces
Dedicated electric air furnace switches engineered for the extreme current cycling and high-duty switching demands of steel mills and metal smelting facilities.
Transmission & distribution
Air break and vacuum switches for T&D infrastructure — sub-transmission isolation, capacitor bank automation, and shunt reactor switching from distribution through 230kV transmission.
Mining & heavy industry
Rugged, reliable high-voltage switches for power-intensive mining and heavy industry operations requiring continuous uptime and long-life switching performance.
PRODUCT SOLUTIONS
VerSaVac® VSV Vacuum Capacitor Switch
Sealed vacuum switch for capacitor bank and shunt reactor switching — 100,000+ operations, no maintenance, no exposed live parts, optional ZVC transient control. 15kV–230kV.
Air Break Switches
Traditional high-voltage air break disconnect switches for substation isolation, line sectionalising, and bus transfer in distribution and sub-transmission applications.
Capacitor Switches (Standard)
Proven capacitor switching technology for utility and industrial capacitor banks — reliable inrush current control and extended capacitor life at medium and high voltage levels.
Varmaster VBM Capacitor Switches
Varmaster series capacitor switches offering advanced switching performance for distribution voltage capacitor banks — designed for high-cycle duty and long service life.
Electric Air Furnace Switches
Specialised high-duty switches engineered for electric arc furnace supply circuits — designed for the extreme switching frequency and current levels of steel and metal production.
Vacstat™ Vacuum Interrupter Monitor
Optional condition monitoring system for VerSaVac switches — tracks vacuum interrupter health, provides early fault warnings, and enables predictive maintenance scheduling.
BRAND HERITAGE TIMELINE
Over a century of American switching innovation
1919
Hi-Voltage Equipment Company founded in Cleveland, Ohio — pioneering high-voltage switching technology for early American power systems.
1950s
Joslyn Corporation acquires Hi-Voltage Equipment Company, combining engineering excellence with expanded manufacturing and market reach.
Later
Thomas & Betts acquires Joslyn Hi-Voltage, integrating proven switching technology into a broader electrical solutions portfolio.
Today
Part of ABB Installation Products — 100% manufactured in Hackettstown, New Jersey, with ABB's global technical support and spare parts network.
CERTIFICATIONS & STANDARDS
- ANSI / IEEE
- UL Recognised
- Made In USA
- NEMA Standards
- IEEE C37 Compliant
- 15–230Kv Rated
- IEC Compatible
- ISO 9001
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