REF 541

Overview

REF 541 is an ABB feeder terminal designed for versatile applications in switchgear, supporting a wide range of network types and offering integrated protection, control, measurement, and automation functions.

Applications

• Compatible switchgear: Single busbar, double busbar, and duplex systems

• Supported networks: Isolated neutral, resonant-earthed, and partially earthed networks

• Additional applications: Medium-sized three-phase asynchronous motors, shunt capacitor banks for reactive power compensation

Functional Capabilities

• Protection functions: Overcurrent, earth fault, and network protection

• Control and monitoring: Measurement, control, condition monitoring, general functions

• PLC functions: Integrated automation and sequence logic for substation automation

Communication Standards

• SPA bus

• LON bus

• IEC 60870-5-103

• IEC 61850 via SPA-ZC 400

• Profibus DPV1 via SPA-ZC 302

• DNP 3.0

• Modbus

• Benefit: LON communication combined with PLC functions reduces hardwiring between feeder terminals

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