Schneider Electric P243-311A2MCD28M

comprehensive protection relay Schneider Electric P243-311A2MCD28M

P243-311A2MCD28M is a comprehensive protection relay for rotating machines (motors/generators) from Schneider Electric’s MiCOM P243 series. It is a high-end digital protection device mainly used for the full protection, control and monitoring of large motors and synchronous motors.

1. Interprétation du code modèle (P243-311A2MCD28M)

P243: Base series, motor differential protection and integrated management relay.

3: Hardware configuration/version (corresponding to I/O, power supply and interface combination).

11: Protection function configuration (including complete motor protection such as differential, surintensité, surchauffe, stall, unbalance protection, etc.).

A2: Auxiliary power supply rating (typically 220–240V AC/DC or 110V DC, subject to nameplate).

M.: CT input type (1UN / 5UN).

C: Communication interface (including Modbus RTU, optional IEC 61850, Profibus-DP).

D28: I/O configuration (par ex.: 16 entrées numériques / 16 sorties relais).

M.: RTD temperature monitoring (supports 6–10 platinum resistance thermometers for winding/bearing temperature measurement).

2. Fonctions principales & Protection Features
3. Main Protection

87 Motor differential protection (phase-to-phase/turn-to-turn faults)

50/51 Overcurrent/instantaneous overcurrent, 49 Stator overheating, 48 Stall/locked rotor

51N/50N Earth-fault overcurrent, 37 Underpower/overpower, 24 Speed supervision

2. Mesures & Monitoring

Three-phase current, tension, pouvoir, fréquence, facteur de puissance

RTD temperature monitoring (windings, bearings, cooling medium)

Motor operating hours, start count statistics, event recording (1000+ enregistrements)

3. Communication & Control

Standard: Modbus RTU

Facultatif: CEI 61850, Profibus-DP, DNP3.0

Programmable logic (API), remote switching, fault recording

3. Applications typiques

High-voltage induction/synchronous motors (pompes à eau, les fans, compresseurs, rolling mills)

Protection of generators and large rotating machinery

Critical motor circuits in industry, pouvoir, metallurgy, petrochemical, municipal engineering, etc..

4. Paramètres techniques (Reference)

Operating power supply: 24–240 V CA/CC (wide range)

CT input: 1A or 5A

I/O: 16 DI / 16 DO (sorties relais)

RTD: 6–10 channels Pt100/Pt1000

Précision: Current ±0.2%, Voltage ±0.5%

Ambient: -25°C ~ +70°C, front panel IP54

5. Differences Within the Same Series

P241: Standard motor protection (without differential)

P242: Enhanced motor protection

P243: Top configuration with differential protection (corresponding to model P243-xxxx)