The ABB RXMA 1 (part number RK 211052-AD) is a high-quality auxiliary relay designed for interposing and general-purpose switching within the COMBIFLEX system. Operating at a rated voltage of 24 VDC, this relay provides reliable isolation and signal amplification between sensitive control logic and heavy-duty field equipment in power substations and industrial plants.

 

Key Specifications

 

Operational Precautions

• Mounting Integrity: Ensure the relay is firmly snapped into its RX terminal base to maintain a low-resistance electrical connection.
• Polarity Sensitive: Verify that the 24 VDC supply is wired to the correct coil terminals as specified on the side-panel diagram to avoid failure.
• Current Limits: Do not exceed the continuous current rating of the contacts, particularly when switching DC inductive loads which can cause excessive arcing.

 

Common Questions Q&A

Q: Can the RXMA 1 be used for high-speed tripping applications? A: While the RXMA 1 is fast, it is primarily designed as an auxiliary/interposing relay. For ultra-high-speed tripping, the RXMS series is typically recommended.

Q: Is the contact state visible from the outside? A: Yes, most RXMA 1 units feature a transparent cover and a mechanical indicator that allows for easy visual inspection of the contact position.

Recommended Similar Models

1. RXMA 2: A larger version with increased contact capacity for complex logic.
2. RXMM 1: A specialized DC relay with low power consumption for sensitive circuits.
3. RXMS 1: A high-speed auxiliary relay with very short operating times.
4. RXMH 2: A heavy-duty version designed for high-current switching.
5. RXSF 1: A signaling relay often used in the same racks for flag indication.

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