Schneider Easergy MiCOM P849 P84930NA6M0A08K I/O Extension Unit

Module Feature

P84930NA6M0A08K is the full ordering code of Schneider Easergy MiCOM P849 bay I/O expansion device.

It works in conjunction with MiCOM series protection relays to expand binary input and contact output capacity for switchgear bay. It collects isolator, earthing switch, circuit breaker auxiliary status, local interlock permissive signals, and executes remote trip, alarm relay output. It supports MIRRORED BITS for high-speed inter-bay logic, IEC61850, Modbus serial communication. Conformal coated circuit board, heavy EMC immunity for HV/MV substation environment. Widely stocked as maintenance spare for power plant, utility substation busbar and feeder protection cabinet.

Working principle

Dry contact status signals are captured by binary input channels and uploaded to main protection relay via internal bus.

When receiving trip or command logic from main protection, the on-board output relays actuate to control circuit breaker, alarm indicator or interlock loop. MIRRORED BITS function transmits digital logic signals between different bay units with short latency for breaker failure and busbar protection schemes. Continuous self-monitoring checks supply voltage, input circuit integrity and relay feedback status.

Onboard components

Signal conditioning board, communication processor, binary input circuit group, power output relay bank, fault detection circuit, front HMI / status LED array, terminal block and metal panel housing.

LED indicators

Front panel LEDs: Power, Healthy, Trip, Alarm, Remote, Communication.

Hardware self‑diagnosis

Built-in supervision detects supply loss, input circuit fault, relay drive failure and communication link interruption. Configuration and diagnosis are completed by Schneider Easergy Studio software.

Programming softwareEasergy Studio, used for input assignment, relay output mapping, mirrored bits logic setup, communication parameter configuration and event record download.

Electrical & Process Parameters

Model:P84930NA6M0A08K Brand:Schneider Electric (Easergy) Device type:MiCOM P849 bay I/O expansion unit Function:Signal acquisition, logic expansion and relay output for substation protection and control bay

Mechanical & Structure

Mounting:19 inch rack flush mount in bay cabinet Protection class:IP54 (front panel) Housing:Metal enclosed rack module

Environmental

Operating temperature:-20℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE, IEC60255, IEC61850 Status:Original Schneider substation I/O spare

Installation

Isolate auxiliary DC supply before replacement.

Check backplane communication connection, verify binary input and trip output wiring, download bay configuration, test status acquisition, relay action and mirrored bits interlock after commissioning.

Interface

Auxiliary DC power terminals, binary input terminals, trip/alarm relay output terminals, rear bay communication bus, Ethernet IEC61850 port.

Diagnostic

Communication offline: Backplane connector loose, address mismatch. Input status no change: Dry contact open, wiring break. Relay no output: Coil damage, interlock blocking.

Product BriefP84930NA6M0A08K unit, Schneider Easergy MiCOM P849 bay I/O expansion spare for substation protection cabinet replacement.