CT-0500-D20

Overview

The Littelfuse CT-0500-D20 is a solid core current sense transformer designed for industrial applications. It features a donut-style construction with a 2-inch (50.8 mm) window diameter, facilitating straightforward installation around conductors without the need to disconnect wiring. The device operates with a current ratio of 500:5, enabling accurate measurement of primary currents up to 500 A by stepping down the signal to a standard 5 A secondary output. This configuration supports reliable monitoring and protection functions within electrical systems.

Feature Summary

• Solid core donut design for non-intrusive conductor mounting
• Standardized 500:5 current transformation ratio
• 2-inch internal window diameter for flexible cable routing

Applications

• Industrial power distribution monitoring
• Electrical panel current sensing
• Motor control circuit protection

Procurement Notes

Verify that the required primary current does not exceed 500 A to ensure safe operation within the rated limits. Confirm that the secondary load impedance remains compatible with the 5 A output specification to maintain accuracy. Ensure the conductor size fits within the 2-inch window clearance. Cross-reference the part number against official Littelfuse documentation to confirm availability and specifications before finalizing procurement orders.

Selection Notes

Select this component when a 500:5 ratio is specifically required for high-current industrial monitoring. The 2-inch window accommodates larger cables or busbars commonly found in heavy-duty applications. Consider the solid core design if frequent disconnection of the primary circuit is undesirable during maintenance. Evaluate space constraints to ensure the donut form factor fits within the enclosure layout.

Part Context

This model belongs to the Littelfuse CT Series of current transformers, which provides various ratios and window sizes for different current levels. The D20 suffix typically denotes the 2-inch window dimension within this product family. These sensors are engineered for durability and precision in demanding electrical environments, offering a standardized solution for current feedback in industrial control systems.

Replacement Considerations

Direct substitutes include other Littelfuse models with identical 500:5 ratios and 2-inch windows, such as variants from the same CT series. Verify physical dimensions and mounting requirements when considering alternative brands. Ensure the replacement maintains the same insulation voltage ratings and accuracy class for critical applications.