ABB REF545KC133AAAA Protective Relay Module
The ABB REF545KC133AAAA Protective Relay Module delivers advanced electrical system protection, ensuring operational reliability and safeguarding critical equipment against faults and overloads. Engineered for industrial environments demanding high-performance safety solutions, this module provides comprehensive protection for power distribution networks, manufacturing facilities, and critical infrastructure.
Technical Specifications
| Brand | ABB |
| Model | REF545KC133AAAA |
| Type | Protection Relay |
| Rated Voltage | Up to 380V AC |
| Rated Current | Up to 20A |
| Frequency Range | 50/60 Hz |
| Protection Functions | Overcurrent, Earth Fault, Phase Disconnection, Overvoltage, Undervoltage |
| Communication | Modbus, Ethernet |
| Operating Temperature | -40°C to +85°C |
| Certifications | IEC 61000-4-4, IEC 61000-4-5 |


Applications & Compatibility
Designed for critical protection in industrial power systems including manufacturing plants, substations, and energy distribution networks. The REF545KC133AAAA integrates seamlessly with ABB’s Relion® protection series and compatible with control systems using Modbus protocols. Ideal for motor protection, transformer safeguarding, and feeder monitoring applications where rapid fault detection is essential.
Our Services
Apex Automation – Founded in 2014, we specialize in ready-to-ship industrial automation solutions with expert technical support. Our team provides:
- Pre-sales technical consultation for optimal system integration
- Comprehensive 1-year warranty on all products
- Priority replacement service for defective units
- Custom sourcing for discontinued or hard-to-find models
Contact us for pricing and availability:
WhatsApp Support |
Email: anikaqx@gmail.com

















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