Product Core Brief
- Model: ABB REM610C55HCNN02
- Brand: ABB
- Series: REL610
- Core Function: MV feeder protection, control, and supervision
- Product Type: Numerical protection relay (IED)
- Key Specs: 1 A / 5 A CT input | 110–250 V AC/DC auxiliary supply | IEC 60870-5-103 / Modbus RTU
- Condition: New Original (New Surplus)
Product Introduction
ABB REM610C55HCNN02 is a numerical feeder protection relay in the REL610 platform designed for medium-voltage distribution networks. It provides selective protection for feeders using time-graded overcurrent and earth-fault elements, supported by thermal and phase unbalance supervision.
The C55HCNN02 configuration defines a specific hardware and I/O architecture within the REL610 family, typically used in industrial switchgear, utility substations, and retrofit projects where IEC 60870-5-103 or Modbus RTU communication is required. The relay integrates protection, control logic, and event recording in a single device to reduce external interlocking hardware.
Frequently Asked Questions
Q: Can REM610C55HCNN02 be hot-swapped?
A: No. CT secondary circuits must never be opened under load. De-energize and short CTs before removal to avoid dangerous voltage buildup.
Q: Is this relay still supported?
A: Yes, but REL610 is considered legacy. ABB continues limited lifecycle support for installed base systems. Firmware and spare availability must be verified per configuration code.
Q: Will I lose settings during replacement?
A: Yes if not backed up. In practice, engineers should export settings via PCM600/PCM500 and physically document terminal wiring and I/O mapping before removal.
