ABB 1MRK000508-CBr00 Binary Input Module

The ABB 1MRK000508-CBr00, also cataloged as the 1MRK000508-CBr00 Binary Input Module (BIM), operates as a high-integrity 16-channel discrete signal interface module within ABB Relion 670 Series Intelligent Electronic Devices (IEDs) for substation automation and protective relaying.

Hardware Specifications

High-Voltage Threshold Filtering & Substation Contact Supervision

Designed for high-voltage power transmission and primary distribution protection, the 1MRK000508-CBr00 module provides isolated, fast-response status acquisition for circuit breaker auxiliary contacts, disconnector switches, and external trip signals. With discrete turn-on thresholds calibrated around 60% of nominal control voltage, the binary inputs effectively reject capacitive induced voltages, station battery ground fault surges, and stray DC leakage currents. Built-in digital filtering prevents false contact chatter during heavy power system switching operations and high electromagnetic interference (EMI) events.

Frequently Asked Questions

Q: Which ABB protection relay chassis series are compatible with the 1MRK000508-CBr00 module?

A: The module is designed as a slide-in card specifically for ABB Relion 670 Series IEDs, including line distance (REL670), differential (RED670), transformer (RET670), generator (REG670), and control (REC670) units.

Q: What are the pick-up threshold voltages for the 110 VDC and 125 VDC nominal operating modes?

A: The module's turn-on threshold is approximately 66 VDC when operating on a 110 VDC nominal system, and approximately 75 VDC when operating on a 125 VDC nominal station battery loop.

Q: How much power does each active channel draw during continuous energized operation?

A: Each activated input channel consumes approximately 30 mA at rated DC control voltage to ensure reliable contact wetting while maintaining thermal stability.

Field Installation Guidelines

• Slide the 1MRK000508-CBr00 card into the designated rear I/O slot of the Relion 670 IED enclosure until the backplane connector seats completely.

• Secure the card faceplate retaining screws to ensure solid electrical ground continuity between the module frame and the main IED chassis.

• Connect DC station auxiliary contact wiring to the rear terminal block, observing exact polarity and ensuring cable insulation ratings meet substation safety standards.

• Ensure field contact wiring runs use shielded cables grounded at the substation panel earthing bar to prevent high-voltage transient noise injection into the binary processing logic.