CR4120S-75

Current Sensors Overview

The CR4120S-75 is a single-channel AC current transducer from the CR Magnetics CR4100 Series, designed for precise measurement of non-sinusoidal waveforms. It utilizes an adjustable transformer sensor type with a 75A detection range and bidirectional polarity. The module provides a proportional DC output signal, available in 4mA to 20mA or 0V to 5V configurations, powered by a 24V supply. Key electrical parameters include ±0.5% accuracy, a frequency response of 20Hz to 5kHz, and a 250ms response time. Operating within a temperature range of 0°C to 60°C, it supports DIN rail or panel mounting.

Current Sensors Feature Summary

• True RMS measurement capability for accurate monitoring of chopped wave and phase-fired control systems
• Bidirectional sensing using an adjustable transformer for versatile AC current applications
• Integrated connection diagram printed on the case for simplified installation and wiring

Current Sensors Applications

• Phase-fired controlled heaters
• Quickly varying motor loads
• Chopped waveform drivers
• Harmonic current monitoring

Current Sensors Procurement Notes

Verify the specific output configuration required, as the CR4120 series offers multiple options including 4-20 mA and 0-5 VDC. Confirm that the 'S' suffix indicates a split-core design, which requires separate verification against official manufacturer documentation to ensure compatibility with the primary conductor size. Ensure the application environment remains within the specified 0°C to 60°C operating temperature range for optimal performance.

Current Sensors Selection Notes

Select this component when high precision is required for distorted AC waveforms where standard transducers may fail. The True RMS feature makes it suitable for phase-fired controls and harmonic-rich environments. Compare input ranges and output types against system requirements; while this model detects up to 75A, verify if external current transformers are needed for extended ranges. Ensure the 24V DC power supply matches the facility's standards.

Current Sensors Part Context

This part belongs to the CR4100 Series of True RMS Current Transducers, which are engineered for superior accuracy compared to conventional devices. The series includes various models differentiated by element count (single, two, three) and input window sizes. The CR4120 specifically represents a single-element variant with a 0.79-inch window, supporting input ranges from 0.5 to 600 AAC depending on configuration.

Current Sensors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.