Description
The VE-CT21 single phase current transformer is designed for accurate and reliable current monitoring across a wide range of commercial, industrial, and utility applications. It is suitable for use with standard metering and protection equipment and provides a safe way to measure electrical current without direct connection to high current conductors.
This transformer supports primary current ranges from 40A to 300A and offers either a 5A or 1A secondary output, making it compatible with most common energy meters and relay products. Its compact design and robust construction make it a dependable choice for long term electrical monitoring in demanding environments.
Features
The VE-CT21 single phase current transformer is supplied with both a DIN rail mounting clip and fixing feet, giving installers flexibility depending on the layout of the electrical panel.
Clear markings are moulded directly into the case to show the correct direction of primary current flow. This helps reduce installation errors and ensures accurate readings from connected meters or relays. The compact moulded case design allows the transformer to fit neatly into control panels where space may be limited.
A sealable terminal cover is included to protect wiring connections and support secure installation. The transformer also features a 21mm cable aperture, which allows it to accommodate a wide range of conductor sizes commonly used in commercial and industrial systems.
Applications
The VE-CT21 single phase current transformer is suitable for monitoring current flow in commercial buildings, industrial facilities, and utility installations. It is commonly used alongside energy meters, multifunction power meters, and protection relays that require a 5A or 1A secondary input.
Typical applications include energy monitoring, load measurement, sub metering, and electrical protection systems. It can be used in offices, factories, warehouses, plant rooms, and distribution panels where accurate current measurement is required to support energy management, fault detection, or system performance analysis.
Because of its reliable output and flexible mounting options, the VE-CT21 is well suited to both new installations and upgrades to existing electrical systems.
Accessories
The VE-CT21 series is supplied as standard with fixing feet and a robust DIN rail mounting clip. These accessories allow the transformer to be securely mounted inside electrical enclosures using the method that best suits the installation.
The transformer is designed to connect easily to standard metering and relay products. It is compatible with a wide range of monitoring equipment used in commercial and industrial electrical systems, making it a versatile addition to many energy measurement setups.
Technical overview
Primary current range from 40A to 300A
5A or 1A secondary output
44mm overall width
21mm cable aperture
Sealable terminal cover
Supplied with DIN rail mounting clip and mounting feet
Compact moulded case design
Clear indication of primary current flow with arrows on the case body
Similar products
For models that can support larger cables, check out our VE-CT28 and VE-CT40 models. As part of our range of current transformers we have single-phase mini split meters for measuring current without disconnecting existing wiring.
Primary and Secondary Current Ratings
Primary Current Range
40A to 300A
Secondary Current Options
5A or 1A
Design and Build
Width
44mm
Cable Aperture
21mm
Features
Cable
21mm Cable aperture
Housing
Features a sealable terminal cover
Design
Compact, making it suitable for spaces with limited room
Functionality
Designed for efficient primary current flow
