The ABB RXMA 1 (specifically part number RK 211052-AD) is a high-performance auxiliary relay designed for the COMBIFLEX mounting system. Operating at a rated voltage of 24 VDC, this interposing relay provides critical galvanic isolation and signal multiplication between low-power control logic and high-power field equipment in power substations and industrial plants.

 

Key Specifications

 

Operational Precautions

• Installation: Ensure the relay is firmly seated in its RX terminal base; a loose connection can lead to high contact resistance or intermittent signals.
• Polarity Check: Confirm that the 24 VDC auxiliary supply is wired to the correct coil terminals as specified on the side-panel diagram to ensure proper operation.
• Load Management: Avoid switching loads that exceed the rated breaking capacity, particularly for DC inductive circuits, to prevent contact welding or premature wear.

 

Common Questions Q&A

Q: What is the primary function of an “interposing” relay like the RXMA 1? A: It acts as a bridge, allowing a low-power signal (such as from a PLC output) to control a higher-power device while protecting the control electronics from electrical noise and surges.

Q: Is the contact status visible from the outside? A: Yes, the RXMA 1 features a transparent cover and a mechanical indicator, allowing for easy visual inspection of the contact position without opening the unit.

Recommended Similar Models

1. RXMA 2: A larger version with increased contact capacity for complex logic circuits.
2. RXMM 1: A specialized DC relay with low power consumption for sensitive auxiliary tasks.
3. RXMS 1: A high-speed auxiliary relay designed for rapid-response protection logic.
4. RXMH 2: A heavy-duty relay variant engineered for high-current making and breaking.
5. RXSF 1: A signaling relay often used alongside the RXMA series for flag indication and alarms.

Technical documentation and inventory details for the ABB RK 211052-AD are available through our specialized product listings.