ABB NTD101 Digital Interface Termination Unit

The ABB NTD101 Digital Interface Termination Unit (often listed as Bailey ABB NTD101) is a 125 V digital interface termination module designed for ABB Bailey Infi 90 and Network 90 cabinets. As a termination unit, it handles field-wire terminations and provides the interface between digital I/O devices and the control network, enabling reliable signal integrity for digital inputs and outputs inside the cabinet. This device is part of the Infi 90/Network 90 family of I/O interface modules and is commonly cataloged with assembly data such as 6632113A1 for the +125 variant. The NTD101 is a legacy component used in older Bailey/ABB installations to complete a digital I/O subassembly within a cabinet, specifically configured for 125 V digital interface applications within that ecosystem.