Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
33749 Wohner current transformer 100 A / 5 A
Wöhner 33749 CT3 current transformer with 100 A primary current, 5 A secondary output, 1.5 VA burden and class 0.5 accuracy for QUADRON 185Power size 00 switch-disconnectors.
£123.42
Why Choose the Wöhner 33749 Current Transformer?
The Wöhner 33749, manufacturer part number 33749 000, is a precision 100 A / 5 A current transformer designed for accurate current measurement in compatible QUADRON® 185Power size 00 fuse switch-disconnectors. With a 1.5 VA rated output and accuracy class 0.5, it delivers highly accurate current measurement for energy monitoring, metering and power management applications.
Manufactured in the compact CT3 frame size, the Wöhner 33749 integrates directly into compatible size 00 switch-disconnectors without increasing panel space. It provides a standard 5 A secondary output for connection to power meters, multifunction measuring instruments and protection equipment while maintaining the modular design of the Wöhner 185Power system.
Featuring class E insulation, a 720 V maximum operating voltage and a 6 kA thermal short-time current rating, the transformer is engineered for dependable long-term performance in industrial switchboards and commercial power distribution systems.
Key Advantages
- Precision 100 A / 5 A current transformer.
- Accuracy class 0.5 for highly accurate current measurement.
- Rated secondary burden of 1.5 VA.
- Compact CT3 frame size.
- Designed for QUADRON® 185Power size 00 devices.
- Ideal for energy monitoring and electrical metering.
- Halogen-free construction.
- Supplied complete with double terminal connections.
Key Features
- Primary rated current: 100 A.
- Secondary rated current: 5 A.
- Rated apparent power: 1.5 VA.
- Accuracy class: 0.5.
- Over-current limitation factor: FS5.
- Maximum operating voltage: 720 V.
- Insulation class: E.
- Double terminal connection.
- Suitable for copper conductors.
High-Accuracy Current Measurement
The Wöhner 33749 converts a primary current of 100 A into a standard 5 A secondary output, enabling accurate monitoring by ammeters, multifunction meters, energy management systems and protection relays. Its class 0.5 accuracy makes it particularly suitable for applications where improved measurement precision is required.
Designed specifically for QUADRON® 185Power size 00 fuse switch-disconnectors, the compact CT3 transformer integrates neatly into switchgear assemblies while maintaining safe electrical isolation between the primary circuit and measuring equipment. The FS5 over-current limitation factor also helps protect connected measuring devices during fault conditions.
Typical Applications
- Industrial switchboards.
- Low-voltage power distribution.
- Energy monitoring systems.
- Electrical metering.
- Power quality monitoring.
- Motor control centres.
- OEM machinery panels.
- Commercial electrical installations.
- Building energy management systems.
- QUADRON® 185Power size 00 switchgear.
Technical Specifications
Tick the specs you need, then view products that match.
| Conductor Size | 2.5–4 mm² | |
|---|---|---|
| Current | 100 A | |
| Manufacturer | Wöhner | |
| Part number | 33749 000 | |
| SKU | 33749 | |
| Product type | Current transformer | |
| System | 185Power / Measurement Technique | |
| Frame size | CT3 | |
| Compatible equipment | QUADRON® 185Power size 00 | |
| Primary rated current | 100 A | |
| Secondary rated current | 5 A | |
| Transformer ratio | 100/5 A | |
| Rated apparent power | 1.5 VA | |
| Accuracy class | 0.5 | |
| Maximum operating voltage | 720 V | |
| Thermal short-time current | 6 kA | |
| Over-current limitation factor | FS5 | |
| Insulation class | E | |
| Power dissipation (80% load) | 3.2 W | |
| Power dissipation (full load) | 5.0 W | |
| Connection type | Double terminal | |
| Conductor size | 2.5 to 4 mm² | |
| Suitable for aluminium conductors | No | |
| Dimensions (W × H × D) | 44 × 30 × 99 mm | |
| Weight | Approx. 0.28 kg | |
| Material | Halogen-free | |
| Pack quantity | 1 | |
| EAN | 4021267337490 | |
| ECLASS | 27210902 | |
| ETIM | EC002048 | |
| Standards | IEC 61869-1:2007, IEC 61869-2:2012 |
Frequently Asked Questions
What is the Wöhner 33749 used for?
The Wöhner 33749 is a current transformer used to convert a primary current of 100 A into a standard 5 A secondary output for electrical monitoring and metering equipment.
What is the transformer ratio?
The Wöhner 33749 has a transformer ratio of 100 A / 5 A, equivalent to a 20:1 ratio.
What accuracy class does the Wöhner 33749 provide?
The transformer has an accuracy class of 0.5, making it suitable for precise monitoring and measurement applications.
Which Wöhner system is it compatible with?
The Wöhner 33749 is designed for compatible QUADRON® 185Power size 00 fuse switch-disconnectors.
Can aluminium conductors be connected?
No. The transformer terminals are designed for copper conductors between 2.5 mm² and 4 mm² and are not suitable for aluminium cables.
Which standards does the transformer comply with?
The Wöhner 33749 complies with IEC 61869-1:2007 and IEC 61869-2:2012 for instrument transformers.
Trusted Current Measurement for Professional Switchgear
Wöhner current transformers are trusted by panel builders, electrical engineers and system integrators for delivering accurate current measurement, reliable long-term performance and seamless integration into industrial low-voltage power distribution systems.
