ABB 1MRK002411-AA Protection Relay I/O Module Unit

Module Feature

1MRK002411-AA is a plug-in I/O card for ABB REL500 / REG670 series numerical protection relays used in power substation.

It integrates multi-channel binary status input and dry contact relay outputs. Relay outputs are used for tripping circuit breaker, alarm signaling and interlock logic. Built-in freewheeling suppression for inductive trip coils. Channel isolation reduces interference from substation high-voltage environment. Supports hot-swap replacement when permitted by relay firmware and system procedure. Coated PCB design, anti-vibration and anti-corrosion, suitable for harsh switchgear cabinet environment. It is widely stocked as emergency maintenance spare for transmission, distribution and industrial power plant protection panels.

Working principle

Binary input circuit detects external breaker auxiliary contact, isolating switch and protection status signal, transmits digital status to relay main CPU.

When protection logic triggers trip or alarm command, the onboard relay contact closes or opens to drive external trip coil or alarm circuit. The module continuously monitors supply voltage and channel wiring fault, and sends diagnostic alarm to relay HMI and SCADA system.

Onboard components

Input signal sampling circuit, isolation optocoupler, electromagnetic relay sets, inductive suppression diode, backplane bus connector, status LED bank, coated PCB and metal front panel.

LED indicators

Front LEDs indicate module power, input channel status, relay output activated and module fault.

Hardware self‑diagnosis

Built-in supervision detects auxiliary power loss, channel short/open circuit, communication failure between I/O board and main relay CPU, relay drive anomaly. Configuration and fault diagnosis are completed by ABB PCM600 software.

Programming softwarePCM600, used for binary input NO/NC definition, output logic assignment, interlock configuration and fault event log reading.

Electrical & Process Parameters

Model:1MRK002411-AA Brand:ABB Device type:Protection relay plug-in I/O module Function:Binary signal monitoring and relay trip/alarm output for substation numerical protection relay

Mechanical & Structure

Mounting:Plug-in into REL500 / REG670 relay internal slot Protection class:IP20 (inside relay housing) Housing:Coated PCB with metal front plate

Environmental

Operating temperature:-25℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE, IEC61850, IEC60255 Status:Original ABB substation protection spare

Installation

Confirm protection relay is out of service and trip circuit blocked before replacement.

Match the correct relay model slot, check backplane connector, verify trip circuit wiring, download protection setting file, test input status capture and relay output action after commissioning.

Interface

Relay backplane communication connector, field wiring terminal block for binary input and relay output.

Diagnostic

No input status change: Auxiliary contact failure, wrong NO/NC setting, wiring open. Output cannot operate: Relay contact burnout, trip coil power missing. Module trouble alarm: Backplane communication loss, module power fault.

Product Brief

1MRK002411-AA I/O module, ABB REL500/REG670 protection relay plug-in input & trip output spare for power substation switchgear protection cabinet replacement.