Advancing railway protection. Making the unseen measurable.

Voltage limiting devices and online monitoring.

RW Railway Technology

Railway protection.With insight and control.

Protect.High‑performance voltage limiting devices.

Measure.Real operating data from your railway infrastructure.

Control.Forced VLD switch‑off with RWVLM FT.

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More capability for your railway application.

The new HP models advance the market-leading 25 kA platform to 34 kA at 50 ms — the highest published recoverable short-time current identified in VLD class 2.

NEW

DC traction · Class 2.1

RWVL2.1HP

RWVL2.1HP voltage limiting device

34 kA at 50 ms

Recoverable short‑time current

One primary switching polarity for DC traction.

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NEW

DC and AC traction · Class 2.2

RWVL2.2HP

RWVL2.2HP voltage limiting device

34 kA at 50 ms

Recoverable short‑time current

Bipolar operation for both voltage polarities.

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ONLINE MONITORING

Measurement and control

RWVLM

RWVLM monitoring hardware

Online Measurement and Monitoring

Rail‑to‑earth voltage, VLD current and fault alerts. FT adds a built‑in forced switch‑off mechanism.

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Explore the technology

Protection. Measurement. Control.

Select a function to see how the equipment works.

RWVL2.2HP voltage limiting device
RWVL2.2HP shown. Select the model for the traction system and required current profile.

Protection when voltage conditions demand it.

A VLD establishes a conductive connection when its triggering conditions are reached, limiting the voltage difference between the railway return circuit and protected structures.

  • Class 2.1: one primary switching polarity for DC traction
  • Class 2.2: bipolar operation for DC and AC traction
  • New HP models: recoverable current of 34 kA at 50 ms
Compare VLD models
RWVLM measured voltage and current traces
Actual RWVLM measurement example, not a live feed. Open the graph to inspect the full‑size traces.

Understand what happens on the railway.

Read rail‑to‑earth voltage and VLD current together to understand activation events and operating behaviour.

  • DC measurement ranges: ±400 V and ±1000 A
  • 1‑second sampling interval
  • Email, SMS and system alerts when a fault is registered
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RWVLM hardware; FT configuration adds forced switch-off
RWVLM hardware shown. Forced switch‑off is provided by the FT configuration.

Monitoring that can also force VLD switch‑off.

RWVLM FT contains its own switch‑off mechanism. It can force the connected VLD to switch off, including VLDs from other manufacturers, without a dedicated control function in the VLD itself.

  • Forced switch‑off hardware integrated in the FT version
  • Specified switch‑off current range: 20⁠–⁠80 A
  • Measurement, monitoring and VLD control
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From technical questions to practical solutions.

Technical knowledge

VLD principles, current ratings, monitoring and stray‑current corrosion.

Read the technical guide

News and events

Product developments, industry events and updates from RW.

See the latest updates

Project cooperation

Application review, product selection and integration with your railway infrastructure.

Discuss your project

Tell us about the traction system, expected current profile and monitoring requirements. We will help you select the appropriate equipment and configuration.

Contact technical sales