CT-0400-D20

Overview

The Littelfuse CT-0400-D20 is a donut-style current transformer designed for industrial applications. It features a 400:5 current ratio and a 2-inch sensor hole window. The device operates within a 120V to 600V range, supporting primary currents from 0.5A to 5A. This component provides accurate current sensing in control circuits.

Feature Summary

• Donut style construction with a 2-inch sensor hole window
• 400:5 current ratio for precise measurement
• Includes bypass circuitry for compatibility with cooling anticipators

Applications

• Industrial current sensing
• 24VAC control circuits
• Systems requiring operation with cooling anticipators ≥ 3000 ohms

Procurement Notes

Verify the specific voltage rating requirements against the datasheet, as sources indicate both 120V and 600V classifications. Confirm the physical dimensions of the 2-inch window fit the installation space. Ensure the 400:5 ratio matches the system's current monitoring needs before procurement.

Selection Notes

Select this model when a 2-inch aperture is required for cable passage. The 400:5 ratio suits applications needing step-down current transformation. Consider the integrated bypass circuitry if interfacing with high-resistance cooling anticipators in 24VAC environments.

Part Context

This part belongs to the Littelfuse CT series of current transformers. It is a free-hanging, in-line component designed for general-purpose current sensing. The series includes various ratios and window sizes to accommodate different industrial monitoring requirements.

Replacement Considerations

The CT-0400-F30 is a related model with a 3.0-inch window but identical 400:5 ratio. Verify window size compatibility when substituting. Other models in the series offer different ratios such as 500:5 or 600:5.