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
Model
1MRK001987-AA
Rated Current (In)
1 A or 5 A
Measurement Range
0.05 – 40 x In
Accuracy
±1% of reading ±0.5% In
Frequency
50 / 60 Hz ±5%
Rated Voltage
24 – 240 V AC/DC
Power Burden (Current)
< 0.1 VA @ In
Power Burden (Voltage)
3 W (stand-by)
In-rush Current
< 10 W for 100 ms
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.
