The ABB RXMB 1 (specifically part number 1MRK 000 804-AN) is a high-precision time-delay relay designed for the COMBIFLEX mounting system. This module is essential for implementing logical delays within protection and control schemes, ensuring coordinated switching operations in power substations and complex industrial automation environments.

 

Key Specifications

 

Operational Precautions

• Setting Accuracy: Always use a calibrated timing test set to verify the delay interval after making manual adjustments to the front-facing potentiometers or dip-switches.
• Terminal Seating: Ensure the relay is fully inserted into the RX terminal base to maintain reliable contact for both the timing circuit and the heavy-duty output contacts.
• Ambient Temperature: Operating the relay outside its specified temperature range can drift the timing accuracy; ensure adequate ventilation within the relay cubicle.

 

Common Questions Q&A

Q: Can the RXMB 1 be configured for both pick-up and drop-out delays? A: This depends on the specific internal wiring of the 1MRK 000 804-AN variant; typically, these units are optimized for one specific timing mode (e.g., delay-on-energization) to ensure maximum reliability.

Q: Is the timing electronically or mechanically controlled? A: The RXMB 1 utilizes high-grade electronic timing circuits to provide superior repeatability and precision compared to older pneumatic or mechanical dashpot timers.

Recommended Similar Models

1. RXMA 1: A standard instantaneous auxiliary relay without timing functions.
2. RXMT 1: A dedicated digital timing relay offering a wider range of programmable intervals.
3. RXKL 1: A specialized time-lag relay often used for alarm and signaling delays.
4. RXMS 1: A high-speed relay used when instantaneous response is required instead of a delay.
5. RXSF 1: A signaling relay for flag indication, frequently paired with timing logic in protection racks.

Detailed technical support and stock availability for the ABB 1MRK 000 804-AN are available through our current automation inventory.