BRN120T5A-2S

BRN120T5A-2S voltage regulator in the aircraft AC power system

BRN120T5A-2S is an aircraft voltage regulator unit used in three phase alternating current power generation systems. It works in the generator control channel and keeps the generator phase voltage within the required operating range. The unit is not a power source by itself. It is part of the regulation circuit that controls how the generator holds voltage under load. In aircraft electrical documentation, BRN120T5A-2S is normally listed with AC generators, generator control circuits, protection units, distribution buses, and the wiring used for the onboard power generation system.

Voltage control function of BRN120T5A-2S

The main function of BRN120T5A-2S is regulation and stabilization of generator phase voltage. During operation, the unit receives power from the DC supply and works with the three phase AC generator system. It maintains the rated adjustable voltage required by aircraft electrical consumers operating at aviation frequency. In practice, the regulator helps keep the generator output stable when load changes occur in the onboard network. It is used in continuous duty operation, so it must remain connected and active during normal generator work rather than only during switching or test procedures.

BRN120T5A-2S and generator system integration

BRN120T5A-2S is installed according to the approved aircraft electrical installation scheme. The regulator is connected into the generator control channel and interacts with the generator excitation and voltage feedback circuits, depending on the exact aircraft wiring. It should be checked together with generator output voltage, control wiring, circuit protection, and power distribution elements. If voltage instability appears in the aircraft AC network, the regulator is only one possible point to inspect. Generator condition, wiring, connectors, and related control units also need to be verified before replacing the unit.

Aircraft application of the BRN120T5A-2S regulator

The unit is used in onboard aircraft electrical power generation and distribution systems with three phase AC generation. Its application depends on the aircraft electrical system design and the approved parts catalog for the specific airframe. BRN120T5A-2S is intended for operation under the environmental and electrical conditions defined by the manufacturer documentation. For aircraft that have passed overhaul or modernization, the installed regulator version should be checked by marking, passport data, and wiring scheme. A regulator with a similar designation may not be enough for correct supply if the aircraft documentation calls for a specific modification.

Identification and interchangeability of BRN120T5A-2S

Before ordering BRN120T5A-2S, the marking on the unit should be compared with the aircraft parts catalog and the manufacturer passport. The unit is specified as interchangeable with BRN120T5A, which is useful when checking available stock or replacement options. Still, the final decision should follow the aircraft documentation and repair records. For procurement, it is better to provide the exact designation from the removed unit, the generator system where it is installed, and the required documentation set. The product is also known under alternative designations BRN120T5A-2S and BRN120T5A.

Product Type: Voltage regulator unit
Function: Regulation and stabilization of three phase aircraft generator phase voltage
Application / Where Used: Aircraft electrical power systems
System / Installation Area: Aircraft three phase AC power generation and distribution system
Compatible Aircraft / Equipment: Aircraft generator control channels using BRN120T5A-2S / BRN120T5A regulator configuration
Operating Voltage: 24.0 to 29.4 V DC
AC Supply Voltage: 22 to 29 V per phase, three phase, 800 Hz
Rated Adjustable Voltage: 117 V, three phase, 400 Hz
Static Voltage Regulation Error: Not more than ±4 V within 115 to 119 V range
Operating Mode: Continuous
Weight: Not more than 1.7 kg
Service Life: As specified in the manufacturer passport
Shelf Life: In manufacturer packaging within the specified period
Interchangeability: Interchangeable with BRN120T5A
Condition: As applicable
Technical Documentation: Manufacturer passport 8A2.549.178 PS and technical documentation available

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