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. Model Code Interpretation (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, sobrecorrente, superaquecimento, stall, unbalance protection, etc.).

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

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

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

D28: I/O configuration (por exemplo: 16 entradas digitais / 16 saídas de relé).

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

2. Funções principais & Recursos de proteção
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. Medição & Monitoramento

Three-phase current, tensão, poder, freqüência, power factor

RTD temperature monitoring (windings, rolamentos, cooling medium)

Motor operating hours, start count statistics, gravação de eventos (1000+ records)

3. Comunicação & Controlar

Padrão: Modbus RTU

Opcional: CEI 61850, Profibus DP, DNP3.0

Programmable logic (CLP), remote switching, gravação de falhas

3. Aplicações Típicas

High-voltage induction/synchronous motors (bombas de água, fãs, compressores, laminadores)

Protection of generators and large rotating machinery

Critical motor circuits in industry, poder, metalurgia, petrochemical, municipal engineering, etc..

4. Parâmetros Técnicos (Referência)

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

CT input: 1A or 5A

E/S: 16 DE / 16 FAZER (saídas de relé)

RTD: 6–10 channels Pt100/Pt1000

Accuracy: 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)