CR8420-1000

Overview

The CR8420-1000 is a current sense transformer manufactured by CR Magnetics Inc., designed for non-invasive AC current monitoring. It features a rated primary current of 50 A and a turns ratio of 1000:1, providing precise signal isolation for measurement circuits. The device operates within a frequency range of 20 Hz to 1 kHz and exhibits a secondary DC resistance (DCR) of 22 Ohms. Constructed as an in-line component, it allows direct insertion into the conductor path without breaking the circuit integrity via external sensors. This model belongs to the CR8300 series, ensuring compatibility with standard mounting configurations.

Feature Summary

• Non-invasive in-line design for direct conductor integration
• High isolation capability for safe current monitoring
• Optimized frequency response for industrial power applications

Applications

• Industrial motor drive current monitoring
• Power supply output current sensing
• Energy metering systems requiring galvanic isolation

Procurement Notes

Verify the specific suffix against the manufacturer's latest datasheet to confirm mechanical dimensions and pinout compatibility. Ensure the operating environment remains within the specified 20 Hz to 1 kHz range to maintain accuracy. Cross-reference the 22 Ohm secondary resistance with downstream amplifier input requirements to prevent loading errors during system integration.

Selection Notes

Select this component when a 50 A primary rating and 1000:1 ratio align with the target application's signal conditioning needs. Consider the in-line form factor if space constraints prohibit split-core or clamp-on alternatives. Validate that the 22 Ohm secondary impedance matches the burden resistor design for optimal linearity across the specified bandwidth.

Part Context

This part belongs to the CR8300 series of current sense transformers from CR Magnetics Inc., which focuses on high-precision magnetic components for power electronics. The series offers various ratios and current ratings to suit different isolation and sensing requirements in industrial and commercial power conversion systems.

Replacement Considerations

CR8349-1000-N serves as a comparable alternative within the same series, though it utilizes a through-hole package rather than the in-line configuration of the CR8420-1000. Verify mechanical fit and mounting style differences before substitution.