VESCO LLC · INNOVATION · SERVICE · QUALITY · COMMITMENT
Vacuum switches & controls — for electric arc furnace, capacitor bank & utility applications
Founded in 1996 by former Joslyn Hi-Voltage engineer Cecil R. Wristen, Vesco LLC (formerly Vacuum Electric Switch Co.) manufactures new vacuum switches and PLC/microprocessor-based controls for switching electric arc furnace transformers, capacitor banks, harmonic filter banks, and reactors. With patented innovations, superior design enhancements, and full field service capability — Vesco is the trusted choice for steel, utility, and renewable energy operators worldwide.
Multiple US patents secured — VES-M, VES-U & SynchroTeq™ are original Vesco innovations
1996
Founded — 25+ Yrs
5–230Kv
Voltage Range
US Patented
Innovations
US Patented
Innovations
SWITCH VOLTAGE CLASS RANGE
5–15Kv
Ves-M Class
Arc Furnace & Distribution
25–34Kv
Ves-M / Ves-U
Capacitor & Arc Furnace
69–138Kv
Ves-U Class
Utility Capacitor Banks
Up to 230Kv
Ves-U High Voltage
Transmission Level
TOP FEATURES
Vacuum interruption
Completely oil-free vacuum interrupter technology — no explosive or combustible materials, safe for personnel, equipment, and the environment.
Modular design
Change voltage rating simply by adding or removing vacuum contact modules — VES-U design supports 69kV to 230kV with scalable module configuration.
SynchroTeq™ zero voltage closing
Patented ZVC control closes switch poles independently, synchronized with zero voltage in each phase — eliminating overvoltage on capacitors and the system.
Virtually maintenance-free
Completely sealed construction — no heaters, no routine exercise required. Normal inspection every 5–10 years or 10,000 operations. Ships fully assembled and adjusted.
Joslyn Hi-Voltage compatible
Replacement parts suitably interchangeable with Joslyn Hi-Voltage VBM and VBU vacuum switches of the same ratings — direct retrofit without system redesign.
PLC & microprocessor controls
Advanced electronic controls with extremely low power demand, modular circuit board design, multi-voltage input (12VDC to 220VAC), and near-simultaneous 2ms closure timing.
SOLUTIONS BY INDUSTRY
Steel & arc furnace
Vacuum switches for electric arc furnace (EAF) transformer switching — rated to 4,000A fault interrupting, with solenoid or motor-operated mechanisms for precise, high-cycle arc furnace control.
Electric utilities
VES-U capacitor switches for utility power factor correction banks from 69kV to 230kV — immune to ice, contamination, and weather for reliable outdoor substation operation.
Capacitor banks
Switching of capacitor banks and harmonic filter banks with Zero Voltage Closing (ZVC) control — eliminating transient overvoltages and reducing capacitor and system stress.
Renewable energy
Vacuum switch solutions for wind and solar farms — reactive power compensation, capacitor bank switching, and distribution sectionalizing in renewable energy collection systems.
Distribution sectionalizing
VES-M switches for electrical distribution line sectionalizing — motor or solenoid operated, with resistor insertion options for back-to-back capacitor bank switching.
Heavy industry
Reactor and harmonic filter switching for large industrial facilities — aluminum smelters, mining operations, chemical plants, and other heavy industrial power users.
PRODUCT RANGE — SYSTEM SOLUTIONS
VES-M Vacuum Switches (5–34kV)
Motor or solenoid-operated vacuum switches for arc furnace, capacitor bank, and distribution sectionalizing — including 2000A and 3000A modules for very large arc furnaces at 34kV.
VES-U Capacitor Switches (69–230kV)
Modular sealed vacuum switches for utility capacitor banks — scalable by adding/removing modules, completely maintenance-free, direct replacement for Joslyn VBU.
PLC & Microprocessor-Based Controls
Single and multi-switch controls accepting 12VDC to 220VAC inputs — modular circuit board design, cable-connected to switches, with near-simultaneous 2ms contact closure.
SynchroTeq™ Zero Voltage Closing Control
Patented precision control module synchronises switch closure to zero voltage in each phase — independently for three poles — eliminating capacitor overvoltage and system disturbances.
Boost Box — Stored Energy Supply
Capacitor-based stored energy supply for switches with inadequate current supply — ensures reliable switch operation in installations with long control cable runs or marginal supply.
Resistor Insertion Switches
Two or three VES-M switches combined with resistor modules for back-to-back capacitor bank applications — limiting inrush currents and reducing switching transients.
Replacement Parts & Modules
Switch modules, vacuum interrupter modules, mechanisms, and control boards — fully interchangeable with Joslyn Hi-Voltage VBM/VBU switches of the same ratings.
Switch Accessories & Service Equipment
Grading capacitors, cable adapters, contact modules, wiring harnesses, and test/installation tooling for commissioning and maintenance of vacuum switch systems.
FIELD SERVICES
New Product Installation
Factory-trained representatives commission new Vesco vacuum switches and controls on-site.
On-Site Repairs
Rapid-response field repair of Vesco and Joslyn Hi-Voltage equipment to minimise operational downtime.
Upgrades & Retrofits
Control upgrades and switch retrofits for existing Joslyn or Vesco installations — enhancing performance without full replacement.
Training & Support
Product training, maintenance guidance, and technical support from engineers with 25+ years in the vacuum switch market.
SPECIFICATIONS & STANDARDS
- US Patented designs
- 100% factory tested
- Joslyn VBM/VBU compatible
- IEEE C37 series
- ANSI C37.60
- Oil-free / SF6-free
- 4,000A fault interrupt
- ZVC capable
- 2ms simultaneous closure
- Multi-voltage control input
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