ABB Bailey NTRO04 Relay Output Termination Unit / Terminal Board

FAQ

Q1: What is the ABB Bailey NTRO04 used for?
A: It is a relay output termination unit used to interface digital output signals from the control system with field devices.

Q2: Is NTRO04 an electronic I/O module?
A: No. It is a termination/interface board, normally used together with the corresponding I/O module.

Q3: What type of signals does NTRO04 handle?
A: It is designed for digital output signals, using relay contacts for field-side switching.

Q4: Which systems use NTRO04?
A: It is associated with ABB Bailey INFI 90 / Net 90 / Harmony control systems.

Q5: Does NTRO04 contain relays?
A: Yes. The NTRO04 belongs to the relay-output termination-unit family used for switching field loads.

Q6: What is the difference between NTRO04 and NTRO04-A?
A: They are different versions of the NTRO04 termination unit. The “-A” version should be matched to the specific I/O module and system configuration rather than assumed to be universally interchangeable.

Q7: What is the difference between NTRO04 and NTRO03?
A: Both are ABB Bailey relay-output termination units, but they are different part numbers with different circuit/relay configurations. They should be replaced only according to the original system documentation.

Q8: What are the dimensions and weight of NTRO04?
A: A practical reference value is approximately 17.8 × 10.2 × 12.7 cm and 0.5 kg. Exact dimensions and shipping weight can vary by revision and packaging.

ABB Bailey NTRO04

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