Description

1. Product Title

ABB REF543CM129AAAA‑ Feeder Protection Relay

2. Product Overview

REF543CM129AAAA is ABB REF543 series multifunctional protection and control relay for medium‑voltage switchgear feeders. It integrates over‑current protection, earth‑fault protection, voltage supervision, measuring functions and bay‑level control logic. Local HMI display shows measurement values, fault records and event logs. Supports IEC61850, Modbus and SPA‑Bus communication for substation SCADA connection. REF543CM129AAAA is spare protection device for power‑plant and industrial medium‑voltage switchgear cabinets.

3. Technical Specifications

• Brand: ABB
• Model: REF543CM129AAAA
• Warranty: One Year
• Condition: 100% New & Original
• Application: MV feeder protection & bay control
• Protection Functions: Over‑current, earth‑fault, voltage protection
• Communication: IEC61850, SPA‑Bus, Modbus
• Power Supply: 24‑250 V DC / AC
• Operating Temp: ‑25°C ~ +55°C
• Mounting: Panel‑mount for switchgear bay
• Front‑panel Protection: IP54
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4. Application Scenarios

• Industrial Medium‑voltage Switchgear: Feeder protection & bay‑control relay replacement.
• Power‑plant Auxiliary MV Distribution Cabinet: Protection spare for motor and transformer feeders.
• Substation Automation Retrofit Project: Drop‑in spare for existing REF543‑series protection installations.