Wöhner 33744 CT5 current transformer with a 150 A primary rating, 5 A secondary output, 1.5 VA rated power and class 1 accuracy for industrial current monitoring and metering.
£107.29
The Wöhner 33744, manufacturer part number 33744 000, is a precision 150 A / 5 A current transformer designed for accurate current measurement in industrial low-voltage distribution and monitoring systems. Featuring a 1.5 VA rated output and accuracy class 1, it provides a dependable secondary signal for compatible meters, monitoring equipment and control systems.
Built in the compact CT5 frame size, the Wöhner 33744 is suitable for applications associated with NH sizes 1 to 3. Its compact dimensions allow it to be integrated into professional switchgear and electrical distribution assemblies where space-efficient current measurement is required.
The transformer provides a standard 5 A secondary output from a 150 A primary current and is supplied with 2.5 mm² connection leads measuring 1.5 metres. Its halogen-free construction, class B insulation and compliance with IEC current-transformer standards make it suitable for demanding commercial and industrial installations.
The Wöhner 33744 converts a primary current of up to 150 A into a proportional 5 A secondary signal that can be processed by compatible ammeters, multifunction meters, energy-management systems and monitoring equipment. This enables electrical loads to be measured safely without routing the full primary current through the measuring instrument.
Its class 1 measurement accuracy makes the transformer suitable for general monitoring and operational metering applications. The FS5 over-current limitation factor helps protect connected measuring instruments by limiting the secondary current under high primary-current conditions.
With a thermal short-time current rating of 9 kA and class B insulation, the transformer is engineered for dependable performance in industrial switchboards and distribution equipment. The supplied connection leads also help reduce wiring time during panel construction and maintenance.
| Current | 150 A |
|---|---|
| Manufacturer | Wöhner |
| Part number | 33744 000 |
| SKU | 33744 |
| Product type | Current transformer |
| Product system | Measurement Technique |
| Frame size | CT5 |
| Associated equipment sizes | NH sizes 1 to 3 |
| Primary rated current | 150 A |
| Secondary rated current | 5 A |
| Transformer ratio | 150/5 A |
| Secondary rated apparent power | 1.5 VA |
| Accuracy class | Class 1 |
| Maximum operating voltage | 720 V |
| Thermal short-time current | 9 kA |
| Over-current limitation factor | FS5 |
| Insulation class | B |
| Typical power dissipation at 80% load | 1.0 W |
| Power dissipation at full load | 1.5 W |
| Connection | Pre-fitted leads |
| Lead cross-section | 2.5 mm² |
| Lead length | 1.5 m |
| Dimensions | 49 × 27 × 70 mm |
| Weight | Approx. 0.14 kg |
| Sealable | No |
| Material properties | Halogen-free |
| Pack quantity | 1 |
| EAN | 4021267337445 |
| ECLASS 14.0 | 27210902 |
| ETIM 5.0 / 8.0 / 10.0 | EC002048 |
| Standards | IEC 61869-1:2007 and IEC 61869-2:2012 |
The Wöhner 33744 is a current transformer used to convert a primary current of 150 A into a standard 5 A secondary signal for electrical monitoring and metering equipment.
The transformer has a ratio of 150 A / 5 A, equivalent to a transformation ratio of 30:1.
The Wöhner 33744 has a class 1 current accuracy rating, making it suitable for general operational monitoring and metering applications.
The rated secondary apparent power is 1.5 VA.
Yes. It is supplied with 2.5 mm² pre-fitted leads measuring 1.5 metres.
FS5 is the over-current limitation factor. It indicates that the transformer is designed to limit the secondary current during high primary-current conditions, helping protect connected measuring instruments.
The current transformer is manufactured in accordance with IEC 61869-1:2007 and IEC 61869-2:2012.
Wöhner current transformers provide panel builders, electrical engineers and system integrators with reliable current measurement, compact installation and dependable integration into industrial power distribution assemblies.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...