ABB REF545KB133AAAA – Feeder Protection and Bay Control for Medium-Voltage Switchgear

The ABB REF545 (REF54x platform) is a multifunction feeder protection and control terminal designed for medium-voltage networks. Model REF545KB133AAAA follows the familiar REF54x architecture with integrated bay control, comprehensive overcurrent/earth-fault protection, and a clear front-panel HMI for fast operation. From my experience, plants choose REF545 when they want dependable protection with solid interoperability to legacy SCADA—without overcomplicating day-to-day switching.

Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: typically 1 week if in stock; no more than 1 month latest
• Payment: 50% advance; full balance prior to delivery
• Express shipping: FedEx, UPS, DHL
• Packaging: anti-static, shock-resistant, moisture-protected for electrical equipment

Key Features

• Feeder protection suite – Typically includes phase/earth overcurrent (50/51, 50N/51N), directional earth fault (67N), thermal overload, under/overvoltage, and under/overfrequency options for MV feeders.
• Integrated bay control – Front HMI with single-line mimic, interlocking, and breaker/isolator command for safe, intuitive switching.
• Breaker failure and autoreclose – BFP and reclosing logic to improve system availability after transient faults.
• Event and disturbance records – Time-tagged events and fault records, typically exportable in COMTRADE for post-fault analysis.
• Flexible I/O – CT/VT measurement, binary inputs, and powerful output contacts to match most switchgear schemes.
• Multi-protocol communications – SPA-bus, IEC 60870‑5‑103, Modbus RTU, and LON (depending on option boards) for smooth SCADA/RTU integration.
• Reliable auxiliary supply – Wide-range AC/DC auxiliary input that fits common substation DC systems.
• Proven platform – REF54x family devices have long field history; spare parts and service know-how are broadly available.

Technical Specifications

Note: Exact I/O count and protocol set depend on the “KB133AAAA” optioning; we can verify against your wiring diagram before shipment.

Application Fields

• Medium-voltage feeder protection in AIS/GIS switchgear and RMUs
• Industrial power distribution (mining, metals, oil & gas, data centers, manufacturing)
• Utility distribution substations and ring networks
• Renewable integration feeders and CHP plants where reclosing and SCADA integration matter

One thing I appreciate is how the REF545 handles everyday operations—operators get a clear mimic and interlocking guidance, which in many cases reduces switching errors during busy maintenance windows.

Advantages & Value

• Reliability in service – Mature hardware with stable firmware; typically low nuisance trip rates when set correctly.
• Compatibility – Multi-protocol support eases integration with existing RTUs/PLCs and legacy SPA-bus networks.
• Lifecycle savings – Retrofitting REF54x within existing panels often minimizes re-wiring and downtime.
• Supportability – Settings and IED management tools are well known in the market, so knowledge transfer is straightforward.

A maintenance supervisor told us their crew cut fault-finding time by half after enabling disturbance recording and standardizing the I/O mapping across bays—seems to be a common win with this platform.

Installation & Maintenance

• Panel/cabinet – Mount on a rigid, grounded switchgear door with adequate ventilation; avoid high-vibration spots.
• Wiring – Use shielded twisted pairs for CT/VT secondaries and time-critical signals; verify CT polarity and burden; segregate power and communication wiring.
• Grounding – Single-point grounding of cable shields; maintain low-impedance protective earth per IEC 60255-27.
• Commissioning – Secondary injection for 50/51/67N pick-up and time checks; validate interlocks and trip circuits; document settings.
• Routine maintenance – Clean the HMI and terminals annually, check tightening torque, back up settings; update firmware where applicable and approved.
• Configuration – The REF54x family is typically engineered with ABB CAP 505; keep a controlled settings baseline for each bay.

Quality & Certifications

• Standards: Designed for protection relays to IEC 60255 series (measurement, insulation, EMC)
• Compliance: CE marked; RoHS compliance typical for the series; UL recognition may apply to certain variants
• Manufacturer quality systems: ISO 9001 production processes (typical for ABB protection devices)
• Warranty: 365-day warranty from us on this unit

If you share your one-line diagram or a picture of the existing relay terminal block, we can confirm the REF545KB133AAAA optioning (I/O map and protocol card) and pre-parameterize to shorten your outage window.