ABB APBU‑44C Branching Unit

Description / Overview

The ABB APBU‑44C is a high-performance branching unit kit designed to extend and manage communication channels in ABB automation networks. It enables multiple I/O modules to connect to the main bus while maintaining signal integrity and galvanic isolation. Moreover, its robust design provides EMC protection and ensures reliable operation in industrial environments. The unit supports both DIN‑rail and rack installation, offering modular expansion without compromising network stability. An enhanced APBU‑44CE version is also available for extreme temperatures and stronger EMC suppression.

Technical Specifications

• Model: APBU‑44C

• Part Number: 64688391 C

• Type: Channel Branching Unit Kit

• System Compatibility: ABB ACS800 drives, DCS/PLC systems

• Max Branch Channels: 4 per unit

• Backplane Bandwidth: 100 Mbps

• Communication Interface: RS‑485 / RS‑422

• Supply Voltage: 24 V DC (±10%)

• Power Consumption: ~3 W (standby)

• Isolation Level: ≥1500 VAC channel‑to‑channel and channel‑to‑rack

• Operating Temperature: 0 °C to +60 °C

• Storage Temperature: –40 °C to +85 °C

• Protection Class: IP20 (with rack enclosure)

• Mounting: DIN-rail or rack plug-in installation

• Country of Origin: Finland

• Weight: 0.9 kg

FAQ

Q1: How many branch channels does the APBU‑44C support?
It supports up to four independent branch channels per unit.

Q2: What communication standards does it support?
The unit supports RS‑485 and RS‑422 communication standards.

Q3: Can it be used in extreme temperatures?
The standard APBU‑44C operates from 0 °C to +60 °C, while APBU‑44CE supports extended ranges.

Q4: How is the unit mounted?
It can be installed on DIN-rails or racks with quick plug-in/out capability.

Q5: Does it provide isolation for signal integrity?
Yes, galvanic isolation is maintained between all channels to prevent interference.