CT-0400-F20

Overview

The Littelfuse CT-0400-F20 is an industrial current transformer designed for accurate current sensing in control circuits. It features a 400:5 current ratio and a 2-inch (50.8 mm) sensor hole window, accommodating primary conductors up to 400 A. The device operates at 120 VAC with a secondary output range of 0.5-5 A. Constructed as a footed model, it utilizes terminal block termination for secure wiring connections. This non-invasive solid core design allows for installation without breaking the primary circuit, ensuring reliable performance in demanding industrial environments.

Feature Summary

• Foot-mounted construction for stable mechanical installation
• Integrated bypass circuitry compatible with cooling anticipators
• Non-invasive solid core design for safe primary conductor monitoring
• Terminal block termination style for straightforward electrical connection

Applications

• Industrial current sensing applications
• 24VAC control circuit monitoring
• Systems requiring compatibility with high-impedance cooling anticipators
• Primary conductor current measurement up to 400 A

Procurement Notes

Verify the specific suffix requirements against the official Littelfuse datasheet to ensure correct window size and mounting configuration. Confirm that the application voltage and current ratings align with the 120 VAC and 400 A specifications. Check for any regional shipping restrictions or compliance documentation required for procurement. Ensure the selected variant matches the necessary bypass circuitry requirements for your specific control circuit design.

Selection Notes

Select this component when a 400:5 ratio and a 2-inch window are required for primary conductor sizes. Consider the footed design if mechanical stability and terminal block access are priorities. Verify compatibility with existing cooling anticipator impedances due to the integrated bypass feature. Ensure the operating environment supports the specified voltage and current parameters for optimal sensor performance.

Part Context

This part belongs to the Littelfuse SymCom CT Series of current transformers. The series offers various ratios and window sizes to accommodate different primary conductor dimensions. The F20 suffix denotes a 2-inch window with footed mounting, distinguishing it from other variants like the D20 or F30 models which offer different physical configurations while maintaining similar electrical characteristics.

Replacement Considerations

Direct substitutes include the CT-0400-D20, which shares the same 400:5 ratio but differs in mounting style. Ensure that any replacement maintains the 2-inch window requirement and terminal block termination. Verify that the alternative part supports the same bypass circuitry functionality for cooling anticipator compatibility.