Description

The ABB PMSI 121 (Product ID: 3BSE005669R1) is a modular hardware power supply assembly engineered to deliver stable internal operating voltage feeds to local control node devices and bus expansion subsystems. This unified product pack supplies clean, regulated electrical power directly across field controller backplanes while simultaneously provisioning necessary physical bus termination. The PMSI 121 3BSE005669R1 kit includes the core power conversion unit alongside a dedicated power supply connector and a TB807 Modulebus terminator plug to prevent communication reflections over adjacent serial links. Built as a compact, rail-ready component, this unit establishes secure distribution lines to eliminate data line sagging and electrical coupling interference within multi-module automation clusters.

Features

• Complete integrated power assembly containing the core power unit, input power supply connector, and a TB807 Modulebus terminator.
• Space-saving compact form factor designed to optimize panel space utilization within industrial control cabinets.
• Combined electrical power delivery and physical Modulebus signal line termination inside a single asset drop.
• Low-loss internal component configuration designed to reduce thermal output and prolong operational durability under continuous load conditions.

Applications

• High-integrity centralized power sourcing for localized I/O clusters and rail-mounted control extensions.
• Specialized bus segment termination and auxiliary electrical supply regulation on dedicated Modulebus drops.
• Processing environments such as material handling, thermal processing plants, and water treatment skids.

Ordering Information

Technical Specifications

Installation Guidelines

• DIN Rail Installation: Snap the module vertically onto a standard top-hat TS 35 DIN rail. Verify that the rear ground grounding clips press tightly against the unpainted surface of the rail to secure a low-resistance EMI grounding bond.
• Bus Termination Sequence: Securely insert the provided TB807 Modulebus terminator plug into the open communication port located on the last physical drop of the segment chain to suppress signal reflection and prevent communication faults.
• Input Power Wiring: Connect the main feed lines into the designated positions of the included power supply connector plug. Double-check wire polarity markings before inserting the plug into the chassis terminal housing to avoid cross-wiring damage.
• Cooling and Ventilation: Maintain clear vertical airflow clearance zones of at least 50 mm above and below the module housing to enable passive convection and prevent structural overheating under full operating load.