Railway locomotives operate in some of the most demanding electrical environments, where reliability, safety, and precision are critical. In 3-phase locomotive systems, Control & Relay Panels play a central role in monitoring electrical parameters, protecting equipment, and ensuring uninterrupted operations.
Arihant Electricals, in collaboration with its sister company Arihant Elsys designs and manufactures advanced control and relay panels specifically engineered for railway and traction applications.
Integrated Engineering Through Arihant Electricals & Arihant Elsys Pvt. ltd.
While Arihant Electricals focuses on robust panel manufacturing and integration, Arihant Elsys contributes specialized expertise in electrical and automation system design and application engineering, This integrated approach ensures each panel is application-specific, thoroughly tested and aligned with railway operating conditions.
Role of Control & Relay Panels in Locomotives
Control and relay panels serve as intelligent electrical hubs that:
- Monitor phase, voltage, current, speed, and temperature
- Protect motors, pumps, and auxiliaries from electrical faults
- Enable safe automation and fault isolation
- Improve equipment life and operational efficiency
Designed for continuous duty, vibration and voltage fluctuations, Arihant’s panels deliver long-term reliability.
Control Relay Systems
Arihant offers advanced control relays for:
- Phase failure detection
- Phase sequence monitoring (with regeneration)
- Over-voltage and under-voltage protection
Available in compact DIN-rail mounted designs (17.5 mm & 35 mm), with single and double changeover relay configurations, these relays ensure stable 3-phase operation.
Speed Control Relays
Speed control relays monitor:
- Under-speed and over-speed conditions
- Wide operating voltage range (24–240 V AC/DC)
- Compact 35 mm housing
These relays enhance operational safety and protect mechanical systems.
Current Control Relays
Current monitoring solutions include:
- Over-current and under-current detection
- With or without built-in CT
- Measurement ranges from mA to 10 A
- DIN-rail mounting in multiple case sizes
They safeguard electrical loads and auxiliaries from abnormal current conditions.
Pump Control & Network Monitoring
Integrated pump control relays provide:
- 3-phase network monitoring
- Phase failure and phase sequence protection
- Over/under current window monitoring
This ensures reliable pump operation and prevents dry-run or overload failures.
Voltage Control Relays
Voltage control relays protect systems against:
- Over-voltage and under-voltage
- Voltage instability across 9 V to 600 V
Available in compact formats, they protect sensitive railway electronics.
Motor Temperature & Phase Protection
Motor protection relays combine:
- Phase monitoring
- Thermal protection using PTC sensors
- Testing and latching functions
This integrated protection improves motor life and reliability.
Level Control Relays
Level control relays manage:
- Conductive liquids and materials
- Multiple sensitivity ranges
- Discrete, PNP and NPN sensor inputs
- Alarm functions for overflow and dry-run
Conclusion
With combined expertise from Arihant Electricals and Arihant Elsys Pvt Ltd. , these control and relay panel solutions ensure safe, efficient and reliable railway operations across modern 3-phase locomotive systems.