The ABB 1MRK001987-AA is a compact current relay designed for precise monitoring and protection applications. This device features a 3-phase current transformer (CT) input, providing robust performance in industrial power management systems.

Features

• 3-phase CT input configuration.
• Wide measurement range from 0.05 to 40 times the nominal current (In).
• High measurement accuracy of ±1% of reading ±0.5% In.
• Versatile power supply compatibility supporting 24 to 240 V AC/DC.
• Harmonic analysis capability up to the 15th harmonic.
• Low power burden for efficient operation.

Technical Specifications

Installation Guidelines

• Ensure the device is powered down before performing any wiring or installation tasks.
• Verify that the CT input wiring is securely terminated and matches the phase configuration of the monitored circuit.
• Maintain proper grounding practices to minimize electromagnetic interference (EMI) in high-voltage environments.
• Ensure adequate ventilation around the unit to prevent thermal buildup during operation.
• Handle with care to prevent electrostatic discharge (ESD) damage to internal components.

FAQ

What is the primary function of the 1MRK001987-AA?
This module serves as a compact current relay designed to monitor 3-phase current inputs for protection and control purposes in electrical systems.

Does this relay support both 50 Hz and 60 Hz systems?
Yes, the unit is designed to operate within a frequency range of 50/60 Hz ±5%.

What is the rated voltage range for the power supply?
The relay accepts a wide input voltage range of 24 to 240 V AC/DC.