ABB 1MRK000005-49 1MRK000161-AA Product Description

Overview

ABB 1MRK000005-49 1MRK000161-AA is a hardware accessory module for ABB RELION 670 series protection and control IEDs. ABB 1MRK000005-49 is the terminal block assembly, while 1MRK000161-AA refers to the matching signal interface board used inside the relay cabinet. This set is designed for galvanic signal routing, wiring termination and status signal transmission for substation protection, measurement and control circuits. It is widely stocked as spare parts for power substation maintenance and retrofit of ABB RELION protection systems.

Features

ABB 1MRK000005-49 1MRK000161-AA adopts robust industrial layout suitable for substation low-voltage secondary circuits. It supports hardwired connection for binary inputs, binary outputs, analog signals and trip circuits between the IED and field equipment. It provides clear signal partitioning and facilitates wiring inspection and loop testing. The assembly has built-in noise suppression to resist substation electromagnetic interference. It conforms to IEC 61850 and IEC 60255 relay standards, and supports DNV optional certification for power plant and marine power systems. The two part numbers are used together as one matched kit for stock identification and traceability.

Specs

Brand: ABB Model: 1MRK000005-49 + 1MRK000161-AA Product series: RELION 670 series accessory Product category: Relay interface terminal kit Application: Secondary signal termination for protection IED Enclosure: For substation cabinet mounting EMC: High electromagnetic interference resistance Standard: IEC 60255, IEC 61850 Lifecycle: Legacy spare part

Principle

ABB 1MRK000005-49 1MRK000161-AA serves as the intermediate signal interface between the RELION IED and field transducers, circuit breaker auxiliary contacts and trip coils. It routes binary and analog signals, maintains circuit continuity, and transfers trip, alarm and measurement feedback signals to the protection relay. Once a fault condition is detected by the IED, the interface assembly transmits the trip command to the primary switchgear.

Applications

ABB 1MRK000005-49 1MRK000161-AA is widely used in power transmission and distribution substations. Typical applications include feeder protection, transformer protection, bay control cabinets, power plant auxiliary protection systems, and spare replacement for existing ABB RELION 670 IED cabinets.