Description

Brief Product Description

The ALSTOM MVAJ105RA0802A is a high-speed, high-burden tripping relay designed for definitive circuit breaker control and interlocking. Featuring a hand-reset mechanism and immunity to capacitance discharge, it ensures secure and rapid fault isolation in power distribution networks.

High-Speed Fault Isolation and Trip Control

The ALSTOM MVAJ105RA0802A functions as a critical intermediary between sensitive protective sensors and heavy-duty circuit breakers. This hinged armature relay specializes in high-speed tripping, typically executing commands in under 10 milliseconds. Because industrial power systems require immediate intervention during fault conditions, this module utilizes a design that virtually eliminates contact bounce. This ensures a clean and definitive signal transmission to the breaker trip coil. Furthermore, the high-burden configuration allows the MVAJ105RA0802A to drive trip coils directly, which simplifies the protection circuit by removing the need for additional interposing hardware.

Secure Hand-Reset and Lockout Functionality

Security remains a primary focus of the MVAJ105RA0802A architecture, specifically regarding its manual reset requirement. Once the relay trips in response to a fault, it locks in the operated position until a technician performs a physical hand-reset. This lockout feature provides essential protection for transformers and generators by preventing the system from automatically re-energizing into a potentially catastrophic fault. Additionally, the relay incorporates advanced immunity to wiring capacitance discharge. This characteristic prevents nuisance tripping caused by stray electrical energy in long cable runs, thereby enhancing the overall stability of the substation or industrial plant.

Versatile Integration in Protection Schemes

The modular design of the ALSTOM MVAJ105RA0802A makes it highly adaptable for complex automation and interlocking logic. Engineers frequently utilize this relay to provide supplemental contacts for signaling, remote monitoring, and multi-breaker tripping sequences. Whether deployed in power generation, high-voltage transmission, or localized distribution, the module maintains peak performance across a wide variety of environmental conditions. Its compact form factor and robust build quality allow for high-density installation in protection panels without sacrificing reliability. By consolidating control and tripping functions into one unit, the MVAJ105RA0802A reduces wiring complexity and streamlines system troubleshooting.

Key Technical Characteristics

• Rapid Trip Execution: Achieves ultra-fast switching speeds of less than 10ms for immediate fault clearance.
• High-Burden Design: Delivers sufficient power to operate breaker trip coils directly without external boosters.
• Secure Lockout Mechanism: Requires a manual hand-reset to ensure thorough inspection before system restart.
• Capacitance Discharge Immunity: Prevents accidental operation due to electrical noise or cable capacitance.
• Minimal Contact Bounce: Ensures high-fidelity signal transmission for reliable circuit breaker triggering.
• Multi-Contact Flexibility: Provides additional poles to support complex interlocking and status reporting.

Technical Specifications