DHR 200 C420 Current Transducer – Product Details

DHR200C420 Overview

The DHR 200 C420 is a compact AC/DC current transducer from the Swiss LEM Group, part of the DHR series. Designed to measure DC, AC, and pulsed currents, it utilizes open-loop Hall-effect technology with galvanic isolation between the primary (power) and secondary (measurement) circuits. The nominal primary current is 200A, with a measurement range up to ±600A peak. Featuring a standard industrial 4-20mA current output, it is ideal for industrial automation, smart grids, power supply management, motor control, and other applications where high accuracy and reliability are essential.

DHR200C420 Key Highlights

High Accuracy Across Full Range – 1% Precision Guaranteed

At rated current (IPN = 200A), the DHR 200 C420 achieves a total error of less than ±1%, with linearity also below ±1%. Combined with True RMS signal processing, it delivers accurate measurements for DC as well as distorted AC waveforms. An offset drift as low as ±6.4 μA/K ensures long-term measurement stability.

Rugged Performance in Harsh Environments – Wide Temperature & Frequency Range

Frequency response from DC to 6 kHz enables precise capture of complex currents from variable frequency drives (VFDs) and thyristor (SCR) controlled loads. With an operating temperature range of -40°C to +70°C, it performs reliably from freezing outdoor conditions to high-temperature industrial sites. A 5kVrms isolation test voltage (50Hz / 1min) guarantees safe operation in high-voltage electrical environments.

Industrial 4-20mA Standard Output – Easy System Integration

The 4-20mA current loop output is directly compatible with PLCs, DCS, and other industrial control systems, eliminating the need for signal conversion and reducing system integration costs and complexity. Response time is less than 150ms, enabling real-time monitoring.

Robust and Safe Design

The housing is made of UL94-V0 rated insulating plastic with excellent flame retardancy. The 32mm aperture allows non-contact measurement, eliminating insertion loss. IP20 protection rating and panel mounting make installation simple.

DHR200C420 Technical Specifications

DHR200C420 Applications

With its excellent measurement performance and industrial reliability, the DHR 200 C420 plays a critical role in various fields:

VFD-controlled loads – Precisely monitor VFD output current to reflect motor and load status, supporting equipment health management.

SCR-controlled loads – Accurately measure current under phase-angle or burst-firing control; faster response than temperature measurement.

Switching power supplies & electronic ballasts – True RMS detection is the most accurate method for input power measurement.

Smart grids & industrial automation – Enable precise current measurement and data acquisition for system transparency.

Motor drive & control – Real-time motor current monitoring for overload protection and energy optimization.

Energy management – Widely used in power management and energy efficiency monitoring systems.

Railway & renewable energy – LEM has deep expertise and proven applications in railway traction and renewable energy equipment.

DHR200C420 Certifications & Warranty

The DHR 200 C420 holds multiple international certifications:

CE certified – Compliant with EMC Directive 2004/108/EEC (IEC61326) and Low Voltage Directive 2006/95/EEC (IEC61010-1).

UL94-V0 – Housing meets UL94-V0 flame retardancy standard.

RoHS compliant – Lead-free, environmentally friendly design.

5-year warranty – Provided by LEM for worry-free use.

Refer to the official datasheet for detailed certification standards.

Why Choose DHR 200 C420?

LEM brand guarantee – Since 1972, the LEM Group has been a world leader in electrical transducers, trusted across industrial, railway, energy, automation, and automotive sectors.

True RMS measurement – Hall-effect based True RMS technology captures actual current in non-sinusoidal and noisy environments – a critical advantage for non-resistive loads like VFDs and switching power supplies.

No insertion loss – The 32mm large aperture allows measurement without inserting the transducer into the main circuit, so system operation is unaffected.

Long-term reliability – Wide temperature range, high isolation voltage, and low drift ensure stable operation even in harsh industrial conditions.

Supply chain security – The DHR 200 C420 is stocked by major authorized distributors; standard lead time from the factory is approximately 6 weeks, with ample spot availability.

The DHR 200 C420 combines decades of LEM electrical measurement expertise, an industrial-grade 4-20mA standard output, ±1% accuracy, and wide temperature/frequency adaptability. Whether you are designing VFD systems, upgrading smart grid infrastructure, or improving measurement precision in your power management system, the DHR 200 C420 is an ideal choice that balances performance and cost-effectiveness.