ABB 1MRK002246-BC Replacement CPU Card for REL/REC Series

Product Overview

ABB 1MRK002246-BC Replacement CPU Card for REL/REC Series: Seamless Transition from Legacy Relay Protection Systems

The ABB 1MRK002246-BC is a CPU card designed for ABB’s relay protection platform, serving as the central processing unit within protection relay panels used across power substations, industrial switchgear, and utility distribution networks. As ABB progressively phases out legacy relay protection hardware, many facilities operating older REL316, REC316, RED670, or REL670 series protection relays are now facing the challenge of sourcing compatible CPU modules to maintain system continuity. The 1MRK002246-BC addresses this need directly — offering a verified drop-in replacement that preserves existing wiring, panel layout, and protection logic without requiring a full relay overhaul.

For engineers managing aging protection relay infrastructure, the primary concern during any CPU card replacement is maintaining the integrity of the protection scheme. The 1MRK002246-BC retains the same physical form factor and backplane connector pinout as the original module, meaning installation does not require rewiring of CT/VT secondary circuits, binary input/output terminals, or communication interface ports. This is critical in live substation environments where minimizing outage windows is a top operational priority.

Communication compatibility is another key consideration. The 1MRK002246-BC supports the same serial and Ethernet-based communication interfaces used in the legacy REL/REC platform, including IEC 60870-5-103 and LON-based station bus protocols commonly found in older ABB protection relay installations. Facilities that have not yet migrated to IEC 61850 GOOSE messaging can continue operating their existing SCADA and RTU communication architecture without protocol conversion or gateway hardware. For sites already running IEC 61850, the module integrates cleanly into the existing station bus topology.

From a power supply standpoint, the 1MRK002246-BC operates within the standard DC auxiliary voltage range used across ABB protection relay panels — typically 24–250 V DC — making it compatible with existing panel power distribution without requiring a dedicated power supply module change. This is particularly relevant in retrofit scenarios where the existing power module, such as an ABB RTXP 18 or RTXP 24 relay base, remains in service.

Installation space is not a concern. The 1MRK002246-BC occupies the same rack slot and uses the same mechanical retention system as the original CPU card, making it suitable for both 19-inch rack-mounted relay panels and flush-mounted switchgear cubicles. No additional mounting hardware, DIN rail adapters, or panel cutout modifications are required.

For facilities upgrading from discontinued ABB relay protection modules — including legacy CPU cards from the REL316*4 or REC316*4 platform — the 1MRK002246-BC provides a validated migration path. Protection engineers can retain existing SPACOM or CAP 531 configuration files and re-parameterize the replacement module using ABB’s standard relay configuration tools, significantly reducing commissioning time compared to a full relay replacement.

During the upgrade process, it is common to simultaneously address adjacent components within the same protection relay panel. Terminal blocks and binary I/O modules such as the ABB RBIO or RDIO series may require inspection or replacement if they have been in service for extended periods. Similarly, the communication front-end module — often an ABB SPA-ZC 22 or SPA-ZC 400 — should be verified for firmware compatibility with the replacement CPU card. In multi-relay installations, the station HMI or operator panel connected via the station bus should also be checked for compatibility with the updated relay firmware version.

For installations that include ABB REC 670 or REL 670 series IED platforms operating alongside the legacy REL/REC316 relays, the 1MRK002246-BC replacement allows the older relay to remain in service as a backup protection element while the primary protection is handled by the newer IED. This hybrid architecture is common in phased substation modernization projects where full relay replacement is deferred to a future capital expenditure cycle.

Power system protection panels often include additional components that should be reviewed during a CPU card replacement project: surge protection devices on CT/VT secondary circuits, fiber optic communication converters for inter-panel GOOSE links, and test switches for secondary injection testing. Ensuring these peripheral components are functional before commissioning the replacement CPU card reduces the risk of false trips or protection maloperation during the post-installation testing phase.

TOPNLMS maintains verified stock of the ABB 1MRK002246-BC and ships from our Xiamen warehouse. Each unit undergoes pre-shipment functional verification and is packaged in anti-static, shock-resistant packaging suitable for international freight. Standard lead time is 3–7 business days for most destinations, with expedited options available for urgent plant maintenance requirements.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful CPU card replacement rarely occurs in isolation. During the migration from a legacy ABB relay protection platform to the 1MRK002246-BC, the following components are commonly evaluated or replaced as part of the same maintenance window:

The ABB SPA-ZC 22 communication adapter is frequently replaced alongside the CPU card in REL/REC316 installations, as it serves as the interface between the relay’s SPA bus and the station SCADA system. Verifying firmware compatibility between the SPA-ZC 22 and the replacement CPU card is a standard commissioning step. In installations where the station bus has been upgraded to IEC 61850, the ABB SPA-ZC 400 Ethernet adapter may be introduced to bridge legacy SPA bus relays into the new station LAN topology.

Binary I/O expansion is another common requirement. The ABB RBIO 11 binary input/output module and RDIO 111 digital I/O module are standard expansion cards used in the same relay panel as the 1MRK002246-BC CPU card. These modules handle trip output contacts, alarm signals, and remote control inputs, and should be inspected for contact wear and firmware version compatibility during the CPU card replacement project.

For power supply integrity, the ABB RTXP 18 relay base and associated DC power distribution modules within the relay panel should be verified for output voltage stability before the replacement CPU card is energized. An unstable auxiliary supply is a common root cause of CPU card failures in aging relay panels.

In multi-relay protection schemes, the ABB REL 670 line protection IED and REC 670 bay control unit may operate in the same substation alongside the legacy REL/REC316 platform. Ensuring that the replacement 1MRK002246-BC CPU card communicates correctly with these newer IEDs — particularly for inter-relay GOOSE blocking and tripping signals — is a critical commissioning verification step.

Finally, for sites performing secondary injection testing after the CPU card replacement, a compatible ABB COMBITEST test switch or equivalent secondary injection test plug should be available to isolate the relay from the CT/VT circuits during testing without disconnecting field wiring.

Retrofit Guidance FAQ

Q: Can I replace the 1MRK002246-BC CPU card without rewiring the CT/VT secondary circuits?
A: Yes. The 1MRK002246-BC uses the same backplane connector and terminal block layout as the original CPU card. CT/VT secondary wiring, binary input/output connections, and communication cables do not need to be disturbed during the replacement.

Q: Will my existing CAP 531 or SPACOM configuration files work with the replacement CPU card?
A: In most cases, yes. The 1MRK002246-BC is compatible with the standard ABB relay configuration toolchain. However, it is recommended to verify the firmware version of the replacement module against your existing configuration file version before commissioning. Minor parameter adjustments may be required for firmware version differences.

Q: Does the 1MRK002246-BC support IEC 61850 communication?
A: The module supports the legacy SPA bus and IEC 60870-5-103 protocols natively. IEC 61850 GOOSE and MMS communication capability depends on the specific firmware version and the communication front-end module installed in the relay panel. Contact TOPNLMS for firmware version confirmation before ordering if IEC 61850 is a requirement.

Q: How much physical space does the replacement CPU card require?
A: The 1MRK002246-BC occupies the same slot dimensions as the original module. No panel cutout modifications, additional DIN rail space, or rack unit changes are required. It is suitable for both 19-inch rack-mounted relay panels and flush-mounted switchgear cubicles.

Q: What is the recommended procedure for commissioning the replacement CPU card?
A: Standard commissioning procedure includes: (1) de-energize the relay panel and isolate CT/VT secondary circuits using test switches; (2) remove the failed CPU card and install the 1MRK002246-BC; (3) restore auxiliary power and verify module self-test status; (4) upload configuration file and verify protection settings; (5) perform secondary injection testing to verify trip output contacts and communication signals; (6) restore CT/VT secondary circuits and return relay to service.

Q: Can this module be used as a spare part for preventive maintenance stock?
A: Yes. The 1MRK002246-BC is suitable for use as a critical spare in substation maintenance inventories. TOPNLMS can supply multiple units for spare parts programs, with consistent batch quality and documentation.

Warranty Assurance

Every ABB 1MRK002246-BC CPU card supplied by TOPNLMS is covered by a 12-month warranty from the date of shipment. Our warranty program is designed to meet the procurement requirements of industrial and utility customers who require documented quality assurance for critical protection relay components.

Pre-Shipment Testing: Each unit undergoes functional verification prior to dispatch, including power-on self-test confirmation and visual inspection for physical damage, connector integrity, and component condition. Units that do not pass inspection are not shipped.

Packaging and Handling: The 1MRK002246-BC is shipped in anti-static packaging with foam cushioning, suitable for air freight and international courier shipment. A packing list and test record are included with each shipment.

Warranty Coverage: The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions. In the event of a warranty claim, TOPNLMS will arrange replacement shipment or credit upon receipt and inspection of the returned unit. Warranty claims are processed within 5 business days of receiving the returned module.

After-Sales Support: Our technical team is available to assist with installation questions, firmware version confirmation, and compatibility verification. Contact us at [email protected] or +86 18359293191 for pre-sales and post-sales technical support.

Lead Time and Stock: The 1MRK002246-BC is maintained in stock at our Xiamen warehouse. Standard shipping lead time is 3–7 business days. Expedited shipping is available for urgent maintenance requirements. Bulk orders for spare parts programs are accepted with confirmed lead times.

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