ABB 1MRK000173-BC Binary I/O Module for Relion 670 Series Protection Systems

Product Overview

The ABB 1MRK000173-BC (often referenced together with ABB 1MRK000005-396) is a high-performance Binary Output Module (BOM) specifically engineered for ABB’s Relion 670 series and select 650 series Intelligent Electronic Devices (IEDs), including the RED670, REL670, and REC670 protection terminals . The 1MRK000005-396 typically serves as an associated component or control board number that appears alongside the main I/O module in system documentation and spare parts ordering, while the 1MRK000173-BC designates the binary I/O extension board itself.

This dedicated ABB 1MRK000173 module acts as the critical interface between the protection relay’s logic and the field switchgear. It translates digital logic decisions—such as trip and close commands—into physical relay contact outputs, while simultaneously reading binary status signals like circuit breaker positions, pressure alarms, and interlock conditions back into the IED. Positioned between the protection relay (e.g., RED670) and high-voltage equipment, the 1MRK000173-BC ensures that protection commands are executed reliably and that field statuses are accurately reported .

Designed for the harsh electromagnetic environment of substations, the ABB 1MRK000173 module features robust isolation of 2.5 kV between inputs, outputs, and ground, along with extensive self-diagnostic capabilities. Its fast response time of under 10 ms ensures that tripping commands are executed with minimal delay, which is critical for fault clearance. The module is a field-replaceable unit, allowing for maintenance and upgrades without replacing the entire IED . The 1MRK000005-396 reference should be verified alongside the 1MRK000173-BC when sourcing replacements to ensure full hardware and firmware compatibility .

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Description

Technical Specifications

Parameter Name	Value
Product Model (Main)	1MRK000173-BC
Associated Component	1MRK000005-396
Manufacturer	ABB (now Hitachi Energy)
Product Type	Binary I/O Module (BOM) / Control Board
Primary Compatibility	Relion 670 Series (RED670, REL670, REC670) & 650 Series IEDs
Digital Inputs	8 channels, 110–125 V DC (standard RL110 range)
Digital Outputs	10 standard + 2 dedicated relay outputs
Output Relay Type	Relay contacts for switching inductive loads (e.g., trip coils)
Output Contact Capacity	30 A closing current; 0.15–0.3 A breaking @ 220 V DC
Isolation Voltage	2.5 kV AC (1 min, input/output-to-ground)
Response Time	< 10 ms (output relay operating time)
Self-Diagnostics	Periodic internal loop test; optical port default safe state on failure
Operating Temperature	-25°C to +70°C
Storage Temperature	-40°C to +85°C
Weight	Approx. 0.47 kg
Installation	Plug-in module into IED chassis slot

Main Features and Advantages

High-Density Binary I/O for Substation Control: The ABB 1MRK000173-BC provides a highly optimized I/O configuration specifically tailored for circuit breaker and disconnector control. With 8 digital inputs rated for 110–125 V DC and 12 relay outputs (10 standard + 2 dedicated), the 1MRK000173 module offers the exact channel count needed to handle a typical bay’s control and signaling requirements—covering trip and close commands, position feedback, and interlock signals. This targeted design minimizes the number of modules required per IED, reducing both hardware cost and rack space consumption.

Superior Electrical Robustness and Isolation: Electrical noise and ground potential differences are constant challenges in substation environments. The ABB 1MRK000173-BC addresses these with a 2.5 kV isolation barrier between the input/output circuits and the IED’s internal logic . This high isolation level protects the sensitive protection relay from voltage surges and inductive kickback from trip coils, ensuring that a field wiring fault does not compromise the IED’s core protection functions. The output contacts are rated to handle the demanding inductive loads of circuit breaker trip coils, with a closing current capacity of 30 A to manage the initial inrush .

Fast and Secure Operation: For protection applications, speed is paramount. The relay outputs on the ABB 1MRK000173 module have a typical operating time of less than 10 milliseconds . This rapid response ensures that tripping commands from the RED670 or REL670 are executed without unnecessary delay, helping to clear faults quickly and minimize equipment damage. The module’s digital inputs incorporate programmable debounce filtering, preventing false signals caused by contact bounce or induced electrical noise from long control cables.

Comprehensive Self-Diagnostics and Field Reliability: The ABB 1MRK000173-BC continuously performs internal loop tests to verify the health of its input and output circuits . If a failure is detected, the module can drive its outputs to a pre-defined safe state via optical port signaling, ensuring that the IED does not issue unintended commands. This self-monitoring capability, combined with the module’s robust design and compatibility with Relion 670/650 series IEDs, makes the 1MRK000173 a field-proven solution for mission-critical protection and control applications. The associated 1MRK000005-396 component reference is often used alongside the 1MRK000173-BC for comprehensive system verification.