As rail transportation continues to evolve toward higher efficiency, greater reliability, and enhanced sustainability, power electronic systems have become the backbone of modern locomotives, metro trains, and high-speed rail networks.

At the heart of these systems, film capacitors play a critical role in ensuring stable power conversion, energy management, and system protection. Designed to withstand demanding operating conditions, railway-grade film capacitors deliver the performance and reliability required by today's rail industry.

Designed for Harsh Railway Environments

Railway applications expose electronic components to continuous vibration, voltage fluctuations, temperature variations, and heavy electrical stress. Capacitors used in these systems must maintain stable performance throughout a long service life while minimizing maintenance requirements.

Compared with conventional electrolytic capacitors, film capacitors offer several key advantages:

• Long operational lifetime

• Self-healing dielectric technology

• Low ESR and reduced power losses

• High voltage and high current capability

• Excellent thermal stability

• Superior reliability under harsh environmental conditions

• Maintenance-free operation

These benefits make film capacitors the preferred choice for critical railway power electronics.

Supporting Key Railway Systems

DC-Link Capacitors

In traction converters and auxiliary power converters, film capacitors provide DC-link energy storage and voltage stabilization. Their low losses and high ripple current capability contribute to improved system efficiency and reliability.

Snubber and Protection Circuits

Fast-switching power devices such as IGBTs and SiC modules generate voltage spikes during operation. Film capacitors effectively absorb transient energy and help protect sensitive semiconductor devices from electrical stress.

Filtering and Power Quality Improvement

Film capacitors are widely used in filtering circuits to reduce harmonics, suppress electrical noise, and improve overall power quality, ensuring stable operation of railway power systems.

Built for Reliability

CABO  film capacitors are engineered using high-quality metallized polypropylene film and advanced winding technology to meet the demanding requirements of rail transportation applications.

Key features include:

• High voltage ratings

• High ripple current capability

• Low self-inductance design

• Excellent resistance to vibration and shock

• Outstanding humidity and temperature performance

• Long service life under continuous operation

• Customizable configurations to meet specific application requirements

Whether used in traction systems, auxiliary converters, onboard charging equipment, or energy storage applications, our solutions are designed to deliver dependable performance throughout the lifetime of the vehicle.

Driving the Future of Rail Transportation

As railway systems continue to embrace electrification, digitalization, and energy efficiency, the demand for high-performance power electronic components will only continue to grow.

With proven reliability, advanced technology, and application-focused engineering, our film capacitors help manufacturers and operators build safer, more efficient, and more sustainable rail transportation systems.