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What is a plug-on current transformer with UL approval (CTB)?
The CTB is a plug-on current transformer with pluggable spring-loaded terminal (Cage Clamp) for tool-free secondary connection and a UL approval that also makes it suitable for systems with US-American or internationally standardized certification requirements.
When a CTB is the right choice
The CTB is suitable wherever a UL certification is required in addition to the pure measuring function – for example in export projects or systems with international acceptance requirements. Without this requirement, the classic plug-on current transformer (ASK) is usually the more obvious choice.
Technical features
- Primary current 50 A to 2.500 A
- Secondary current 1 A and 5 A
- Accuracy classes 1 and 3
- 20 % continuous overload possible
- UL-certified, plug-in terminal (Cage Clamp)
Mounting and safety
The secondary circuit of a current transformer must never be operated open during operation – before disconnecting measuring devices in the secondary circuit, it must be short-circuited.
The unbreakable, self-extinguishing polycarbonate housing guarantees maximum safety and durability
Versions at a glance
The available CTB variants can be found in the product list above. If you have any questions about the right selection, please use our contact form or call us.