CT-0300-D10

Overview

The Littelfuse CT-0300-D10 is a donut-style current transformer designed for non-invasive alternating current measurement. It features a 300:5 current ratio and a 1-inch (25.4 mm) sensor hole window. The device operates at 24VAC with a current rating of 300A, supporting a secondary output range of 2-20A. This solid-core configuration allows for direct wire insertion without circuit interruption.

Feature Summary

• Donut-style solid core design for non-invasive current sensing
• High accuracy 300:5 current transformation ratio
• 1-inch aperture accommodates standard wiring configurations

Applications

• Industrial power monitoring systems
• Electrical panel current sensing
• Energy management metering

Procurement Notes

Verify the specific ordering suffix matches the required termination style and insulation class. Confirm that the 1-inch window dimension aligns with the conductor size in your installation. Ensure the 300:5 ratio meets the input requirements of your connected measuring instrument or relay. Cross-reference the datasheet for environmental operating limits before deployment.

Selection Notes

Select this model when a 300A primary current capacity is required with a 5A secondary output. The 1-inch window size dictates the maximum cable diameter that can pass through the sensor. Consider the physical mounting constraints of the donut form factor within the electrical enclosure space available for installation.

Part Context

This component belongs to the Littelfuse SymCom CT series of current transformers. These devices are engineered for industrial applications requiring reliable current monitoring. The series offers various window sizes and ratios to suit different conductor dimensions and current levels.

Replacement Considerations

Direct substitutes include other Littelfuse models with identical 300:5 ratios and 1-inch windows, such as the CT-0300-D20 if the window size permits. Verify mechanical fit and electrical specifications before swapping components.