TF1-75.150/1

TF1-75.150/1A current transformer for aircraft systems

TF1-75.150/1A is an aircraft current transformer used in onboard AC electrical measurement systems. The unit scales higher alternating current values to a standardized secondary current suitable for aircraft ammeters and monitoring instruments. It allows current in aircraft electrical circuits to be measured without passing the full load current through the cockpit instrument. The transformer is an element of the measuring circuit, not a power converter, circuit breaker or engine control unit.

Current scaling through TF1-75.150/1A

The transformer converts primary AC current into a proportional secondary output for indication and monitoring. It supports two primary current ranges, selected by the way the primary conductor is passed through the transformer. With a different number of primary turns, the same transformer can be used for either lower or higher current measurement ranges. This makes correct installation important: the selected range must match the aircraft wiring diagram and the scale of the connected ammeter.

TF1-75.150/1A with onboard ammeters

The transformer is intended to work with aircraft AC ammeters or related measuring devices designed for a standardized secondary current. In this arrangement, the ammeter displays current in the monitored circuit while the transformer provides electrical isolation and current scaling. The unit is used in aircraft AC systems with aviation frequency, including standard 400 Hz networks. If current indication is incorrect, the check should include the transformer, ammeter, secondary wiring, primary conductor routing and circuit connection points.

Aircraft application of TF1-75.150/1A

TF1-75.150/1A is used in electrical measurement circuits of helicopters such as Mi-8, Mi-17 and Mi-26, depending on configuration. It may be installed in circuits related to engine, transmission or auxiliary system monitoring where AC current parameters must be controlled. Exact applicability depends on the aircraft modification, electrical system layout and associated measuring instrument. Similar transformers may differ by primary current range, secondary current, frequency range or installation method, so replacement should be confirmed by documentation.

Identification and ordering of TF1-75.150/1A

Before ordering, the full designation should be checked against the aircraft electrical documentation or product passport. The unit may also be referenced as TF1-75.150/1, but the secondary current designation should be confirmed before supply. For correct selection, provide the aircraft type, electrical system application, required current range, associated ammeter and a photo of the existing transformer if available. The product is also known under alternative designations TF1-75.150/1A and ТФ1-75,150/1А.

Product Type: Aircraft current transformer
Function: Scaling of alternating current for measurement
Application / Where Used: Aircraft electrical measurement systems
System / Installation Area: Engine and transmission monitoring circuits
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-26 helicopters
Nominal Secondary Current: 1 A
Primary Current Ranges: 0–75 A; 0–150 A
Frequency Range: 400 Hz; operable 350–1200 Hz
Current Error: Not more than ±0.5%
Phase Error: Not more than 40 min
Primary Winding Ampere-Turns: 150
Primary Winding Turns: 2 for 75 A; 1 for 150 A
Operating Temperature Range: −60 to +150 °C
Short-Term Maximum Temperature: +400 °C
Vibration Resistance: Up to 4.5 g at 20–200 Hz
Dimensions: 95 × 75 × 32 mm
Weight: 0.325 kg
Alternative Designations: TF1-75.150/1; TF1-75.150/1A; ТФ1-75,150/1А
Technical Documentation: Current Transformer TF1-75.150/1 technical documentation

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Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.