Condition: New Original (New Surplus), not refurbished. Limited stock available.
The RET650 300 5A is a transformer protection IED from the Relion 650 series engineered for reliable operation on systems with 5A secondary current transformers. It targets two- and three-winding power transformers, autotransformers, and similar assets in utility and industrial substations.
This configuration provides the standard suite of differential protection with harmonic restraint alongside backup overcurrent, thermal, and supervision functions. Procurement teams choose it when matching existing 5A CT circuits without additional adapters. It integrates cleanly into 650 series environments with support for modern station bus protocols.
Key Technical Specifications
- Application: 2/3 winding transformer protection (5A CT inputs)
- Protection Principle: Stabilized percentage differential with 2nd/5th harmonic blocking
- Rated Current: 5A nominal (phase and neutral inputs)
- Rated Frequency: 50/60 Hz
- Communication: IEC 61850, Modbus, IEC 60870-5-103
- Event Recording: Disturbance recorder with non-volatile memory
- Power Supply: 24-250 V DC / 100-240 V AC (verify nameplate)
- Operating Temperature: -25 to +55°C
- Mounting: 19″ rack or flush, modular withdrawable where applicable
- Firmware: Record specific revision on receipt (typical 1.x or 2.x)
- I/O Configuration: Multiple CT/VT inputs depending on exact hardware module
Incoming Inspection Verify packing list and any available import declaration. Match serial number to label for authenticity. Visual inspection confirms no corrosion, scratches, repair marks, or aging. Check for included accessories and documentation.
Live Functional Test Conducted on RET650 test rack with appropriate simulator. Power-on self-check validates LEDs and boot behavior. Comms handshake tested on supported protocols. Full I/O simulation covers differential and backup functions. Unit runs continuously over 24 hours with temperature monitored. Test Report generated; photos and video evidence available upon request.
