CR8420-1000-G

Overview

The CR8420-1000-G is a current sense transformer manufactured by CR Magnetics Inc., designed for non-invasive current monitoring in electronic circuits. It features a free-hanging (in-line) installation type with wire lead termination, suitable for through-hole or direct wiring integration. The component supports a rated current of 20 A and provides a precise current ratio of 1000:1 for accurate signal scaling. It operates within a frequency range of 20 Hz to 1 kHz, making it appropriate for standard power line frequencies and low-frequency applications. The DC resistance (DCR) of the secondary winding is specified at 44 Ohms. The device is RoHS compliant and classified under ECCN EAR99, indicating general commercial availability without strict export restrictions.

Feature Summary

• Non-invasive solid core design allows for easy integration into existing wiring without circuit interruption
• High isolation capability ensures safety and noise immunity in sensitive measurement environments
• Linear response characteristics maintain accuracy across the specified operating frequency range

Applications

• Current monitoring in industrial motor drives and inverters
• Power quality analysis and energy metering systems
• Protection relay circuits requiring isolated current feedback

Procurement Notes

Verify the specific ordering suffix to ensure the correct packaging and lead time requirements are met for your production schedule. Confirm that the 20 A rating aligns with the maximum expected load current in your application to prevent saturation. Check for any specific environmental certifications required by your target market, such as UL or CE compliance documentation, before finalizing procurement orders.

Selection Notes

Select this model when a non-invasive, in-line current sensing solution is required for currents up to 20 A. Ensure the system frequency falls within the 20 Hz to 1 kHz operational range for optimal performance. Consider the 1000:1 turns ratio to determine if the resulting secondary current matches the input impedance of your downstream measurement or protection circuitry without additional scaling components.

Part Context

This component belongs to the CR Magnetics current sense transformer family, which specializes in high-isolation magnetic sensors. The CR8420 series specifically targets applications requiring robust, non-invasive monitoring with reliable linear performance. These transformers are engineered to provide stable operation in demanding electrical environments, supporting both measurement and protection functions in modern power electronics infrastructure.

Replacement Considerations

Direct substitutes may include other models from the CR8300 or CR8400 series with matching 20 A ratings and 1000:1 ratios. Verify physical dimensions and terminal styles to ensure mechanical compatibility. Cross-reference datasheets for identical frequency ranges and DC resistance values to maintain circuit performance integrity.