| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 280V 9.5A |
4 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 560V 3.5A |
3 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 560V 9.5A |
0 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 132V 2.5A |
0 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 280V 3.5A |
34 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 280V 10A |
2 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 140V 5A |
5 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 280V 15A |
0 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 140V 10A |
16 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 280V 3.5A |
3 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 140V 2A |
4 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 140V 5A |
4 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 140V 10A |
0 |
|
 |
Staco Energy Products Co. |
MOTORIZED VRBLE TRANSF 280V 5A |
6 |
|
 |
Krohn-Hite Corporation |
IMPEDANCE MATCHING TRANSFORMER |
2 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 120V 12A |
5 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 140V 22A |
4 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 132V 2.5A |
12 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 280V 35A |
2 |
|
 |
Staco Energy Products Co. |
VARIABLE TRANSFORMER 280V 35A |
0 |
|
Variable transformers are adjustable electrical devices that provide precise voltage transformation ratios for testing, calibration, and power control applications. By enabling continuous voltage adjustment between primary and secondary circuits, these transformers play a critical role in power electronics development, electrical safety testing, and industrial process optimization. Their ability to simulate real-world voltage conditions ensures their importance in modern electrical engineering workflows.
| Type | Functional Characteristics | Application Examples |
|---|---|---|
| Autotransformer | Single winding with multiple taps, compact design, galvanic isolation | Motor starting circuits, voltage regulation in distribution systems |
| Isolation Transformer | Separate primary/secondary windings, safety isolation, noise suppression | Medical equipment testing, industrial safety systems |
| Multi-tap Transformer | Fixed voltage steps via mechanical switching, high precision | Transformer ratio testing, laboratory calibration |
| Variable AC Transformer (Variac) | Continuous sliding contact, 0-130% voltage range, manual adjustment | Prototyping, production line testing, power quality analysis |
Typical construction includes: - Core: Cold-rolled silicon steel laminations for high magnetic efficiency - Windings: Copper/aluminum conductors with thermal class F/H insulation - Adjustment Mechanism: Rotary knob or motorized actuator with precision scale - Enclosure: Powder-coated steel with thermal protection and EMI shielding - Connections: Safety terminal blocks with IP20 protection rating
| Parameter | Importance |
|---|---|
| Voltage Range (0-130% Vnom) | Defines operational flexibility and test coverage |
| Power Rating (VA/kVA) | Determines load capacity and thermal stability |
| Regulation Accuracy ( 0.5%) | Impacts measurement precision and repeatability |
| Frequency Range (50-60Hz standard) | Dictates compatibility with different power systems |
| Insulation Class (F/H) | Affects safety and long-term reliability |
| Response Time (ms range) | Critical for dynamic voltage control applications |
Key industries include: - Power Generation: Grid simulation and protection system testing - Electronics Manufacturing: Component stress testing and burn-in - Automotive: EV charging system validation - Aerospace: Avionics power quality compliance testing - Research Labs: Experimental power circuit development
| Manufacturer | Representative Product |
|---|---|
| Keysight Technologies | N6700 series programmable AC sources |
| Tektronix | ISOVOLT series isolation transformers |
| Fischer Elektronik | FTS 1000 transformer test systems |
| MEAS Switzerland | LVDT-based variable transformers |
Consider: 1. Voltage/power requirements with 20% safety margin 2. Adjustment resolution vs. application precision needs 3. Thermal stability in continuous operation 4. Digital interface requirements (GPIB/USB/LAN) 5. Safety certifications (IEC 61557-5, UL 61010)
Current developments include: - Integration of IoT-enabled remote control systems - Adoption of amorphous core materials for reduced losses - Development of solid-state variable transformers (SSVT) - Increased focus on wide-bandgap semiconductor compatibility - Implementation of predictive maintenance via embedded sensors
A semiconductor manufacturing plant uses 10kVA variable transformers to simulate voltage sags and swells during equipment qualification, ensuring compliance with SEMI F47 standards for voltage immunity requirements.