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  • Electrification

Voltage limiting devices

ESTRA-VGUARD

Sécheron’s VGUARD voltage limiting device is built on proven technologies and meets the electrical safety and internal arc testing requirements in the EN 50122-1 and EN 50526-2 standards.

  • Electrification

Voltage limiting devices

ESTRA-VGUARD

Sécheron’s VGUARD voltage limiting device is built on proven technologies and meets the electrical safety and internal arc testing requirements in the EN 50122-1 and EN 50526-2 standards.

Main benefits

  • Fast response time
  • Combined protection of personnel, passengers and installation
  • Proven protection built on Sécheron products
  • Prevents and eliminates dangerous voltages
  • Guaranteed low residual voltage
  • Automatic recovery
  • Bidirectional operation and protection
  • Meets EN 50122-1 electrical safety requirements
  • Type tested against internal arcs to EN 50526-2 standards

Sécheron possesses years of experience developing and manufacturing electrical safety products and solutions for railway DC traction power substations. We are committed to delivering equipment that protects property, passengers, and personnel. Our know-how covers voltage limiting devices.

During normal operation of railway electrical systems, dangerous voltages can flow through accessible points of the return and earthing circuits. This is due to voltage drops along the return circuit caused by current train traffic or isolation faults.

To keep these voltages below the admissible values defined in the EN 50122‑1 standard, a voltage limiting device must be used as a short‑circuiter between the negative and earth potentials. Our VGUARD voltage limiting device integrates proven Sécheron technologies. Our know-how also covers critical devices like protection relays, measurement amplifiers, and thyristor-based static switches.

Brochures

  • Voltage limiting devices - VGUARD
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  • Wayside panels
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Product description

  • Rated current up to 1’200A.
  • Rated voltage up to 3’600 Volts.
  • Application: limitation of dangerous touch voltages.
  • VGuard-B (Basic) designed according to Class 3 of EN 50526-2.
  • VGuard-H (Hybrid) designed according to Class 4 of EN 50526-2.
  • Remote motorized operation or manual operation on site.
  • Movable connections allowing by-pass or isolate the equipment for safe test or maintenance purposes.
  • Making current and short-time withstand currents adapted to applications.
  • Control voltage from 24 to 220 VDC, 230 VAC.
  • High mechanical & electrical durability, low maintenance.
  • Protection degree IP42 for indoor or IP65 for outdoor application.
  • Adaptable panel dimensions for wayside or tunnel installation.
  • Optional association with stray current monitoring system SCMS.

Request for quotation

For a request for quotation, please visit our dedicated contact center by clicking the Sécheron Support and then selecting “Request for Quotation” in the Help topics.

Sécheron Support
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