Overview
The ABB RXMVE 1 RK 257 008-AD is a bistable auxiliary remanence relay designed for general-purpose control and signaling in industrial electrical systems. Manufactured by ABB (formerly ASEA), this relay features two independent windings that allow pulse-operated or continuously energized control with persistent contact memory. The relay maintains its contact position even when power is interrupted, making it ideal for fail-safe interlocking and memory circuits in legacy and modern control panels.
Key Features
- Bistable remanence design with two separate operating and reset windings
- Medium-duty contact configuration suitable for light to medium duty applications
- Pulse or continuous operation mode—contacts retain position after voltage loss
- Compact, time-tested design proven in decades of industrial deployment
- Operates within 80–110% of rated voltage range
- Manual override operation available (model-dependent)
Technical Specifications
Relay Type: Bistable auxiliary remanence relay with two windings. One winding operates the contacts into one position; the other resets contacts to the first position. The contacts are of medium-duty type rated for light to medium duty applications where published DC interrupting ratings apply.
Operating Principle: The relay can be pulse-operated or continuously energized. Contacts remain in their last position if supply voltage drops, providing inherent memory function without external power.
Typical Applications
- Motor control interlocking and permissive logic circuits
- Auxiliary signaling and status indication in switchgear and control panels
- Fail-safe memory circuits requiring contact retention on power loss
- Legacy electrical systems and retrofits where backward compatibility is required
- DC and AC control circuits in medium-duty industrial environments
Compatibility & Replacements
The RXMVE 1 series has been superseded by ABB’s RXMD 1 bistable relay family for new installations. However, the RXMVE 1 RK 257 008-AD remains a direct fit for existing equipment. When upgrading systems, verify wiring diagrams and required data; the RXMD 1 uses common DC negative coil connection and offers additional contact options not present in legacy RXMVE 1 designs. Consult ABB technical documentation before field replacement to ensure compatibility with your specific control application.
