Description
Product Introduction
REF542 1VCR007346 G0028 is ABB’s REF542plus multifunction protection and switchgear bay control unit for medium-voltage applications. It integrates feeder, transformer, and motor protection with measurement, monitoring, control, and self-diagnostics in one package.
The unit supports IEC 61850, Modbus RTU, and Profibus, runs on 48–250V DC or 100–240V AC, and has expandable I/O (16 DI, 8 DO). Firmware G0028 is a specific revision; this product is discontinued since 2020, so inventory is limited to surplus stock.
Frequently Asked Questions
Q: Does it support hot-swapping?
A: Honestly, no. This is a protection and bay control unit tied to trip circuits. You must isolate the bay, disable trip outputs, and follow lockout-tagout before removing the unit.
Q: Is it obsolete? Are there direct replacements?
A: Yes—REF542plus (1VCR007346) is not active since 2020. For new installations, ABB recommends the Relion 615 series or newer REF542plus-compatible units. If you’re retrofitting an older REF542, this REF542plus is the functional replacement with nearly 100% compatibility.
Q: Will I lose my program during replacement?
A: The most common mistake is assuming settings carry over automatically. Back up all protection parameters, logic modules, event records, and communication configs before removal. REF542plus uses freely configurable software modules, so you must restore and verify each function point by point.
