ABB Bailey NTRL03 Remote Link Termination Unit

Network Termination and Signal Integrity

The ABB Bailey NTRL03 terminates remote communication links in Bailey control networks. This unit prevents signal reflections on long-distance data cables. It ensures reliable data transmission between distributed system nodes.

Technical Specifications

Parameter	Specification
Model	NTRL03
Category	Remote Link Termination Unit
Height	130 mm
Width	45 mm
Depth	105 mm
Weight	0.28 kg
Termination Resistance	120 Ω (precision metal film)
Isolation Voltage	2500 V RMS (field to system)
Cable Type Supported	Twisted-pair shielded (Belden 9841)
Maximum Cable Length	1200 meters
Number of Connections	2 x screw terminal pairs (in/out)
Connector Type	1 x 6-pin screw terminal block
Status Indicator	None (passive device)
Internal Components	1 resistor network, 1 surge suppressor, 1 terminal block
Energy Storage	None (no battery or capacitor)

Internal Architecture and Signal Termination

The NTRL03 contains three primary internal components for link termination. One precision 120 Ω metal film resistor terminates the communication line. One surge suppressor protects against voltage spikes and lightning strikes. A 6-pin screw terminal block provides incoming and outgoing cable connections. The ABB Bailey NTRL03 uses no active electronics or power supply. This passive design ensures zero power consumption and infinite reliability.

Installation and Network Configuration

Install this termination unit at both ends of each remote link segment. Connect the incoming cable to the “LINE IN” terminal pair first. Wire the outgoing cable to the “LINE OUT” terminals for daisy-chaining. Set the termination jumper to “ON” only at the physical line ends. Leave the jumper “OFF” for all intermediate connection points. The NTRL03 matches the characteristic impedance of Belden 9841 cable perfectly.

Surge Protection and Isolation Features

This termination unit provides 2500 V RMS isolation between field and system. The internal surge suppressor clamps voltages above 30 V safely. It diverts excess energy away from the connected communication module. The ABB Bailey NTRL03 withstands repetitive lightning strikes without damage. You can install it in outdoor cabinets or exposed locations.

Physical Dimensions and Mounting Guidelines

The ABB Bailey NTRL03 weighs only 0.28 kilograms for simple mounting. Its height measures 130mm, width 45mm, and depth 105mm. Mount this termination unit on standard DIN rails inside the cabinet. Place the NTRL03 as close as possible to the communication module. The unit operates reliably from -40°C to +85°C ambient temperature. This wide range suits outdoor and harsh environment installations.

Energy Storage and Maintenance Status

The NTRL03 stores no electrical energy internally. It includes zero batteries or capacitors of any kind. Hence, this termination unit requires no periodic maintenance whatsoever. You will never replace batteries or discharge stored energy. The resistor network will last indefinitely under normal operating conditions.