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True RMS current transducer with 4-20 mA output
| Supply Voltage | 2) +20 ... 50 V DC |
| Operating Temperature Range | −40 ... +70 °C |
| Isolation Test Voltage | 4.0 kV |
| Current Consumption (IC) | 30 mA + I Advantages |
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 4.0 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 7.3 kV |
VFD Controlled Loads VFD output indicates how the motor and attached load are operating, SCR Controlled Loads Acurate measurement of phase angle fired or burst fired (time proportioned) SCRs. Current measurement gives faster response than temperature measurement, Switching Power Supplies and Electronic Ballasts True RMS sensing is the most accurate way to measure power supply or ballast input power. Application Domain, Energy and Automation.
The DHR 400 C420 is a None current transducer from LEM for the electronic measurement of currents: DC, AC, pulsed..., with galvanic isolation.
Typical applications include VFD Controlled Loads VFD output indicates how the motor and attached load are operating, SCR Controlled Loads Acurate measurement of phase angle fired or burst fired (time proportioned) SCRs. Current measurement gives faster response than temperature measurement, Switching Power Supplies and Electronic Ballasts True RMS sensing is the most accurate way to measure power supply or ballast input power. Application Domain and Energy and Automation. Page 1/4 LEM International SA Chemin des Aulx 8 www.lem.com.
Key characteristics from the official datasheet: operating temperature −40 ... +70 °C.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | DHR |
| Product Reference | DHR 400 C420 |
| Supply Voltage | 2) +20 ... 50 V DC |
| Measurement | currents: DC, AC, pulsed... |
| Mounting | Panel Mount |
| Application Domain | Energy and Automation |
| Electrical Data — DHR 400 C420 | |
|---|---|
| Supply Voltage (UC) | 2) +20 ... 50 V DC |
| Current Consumption (IC) | 30 mA + I Advantages |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 4.0 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 7.3 kV |
| Creepage Distance (dCp) | 7.2 mm |
| Clearance (dCI) | 7.2 mm |
| Comparative Tracking Index (CTI) | 600 |
| Overvoltage Category / Pollution Degree | Over voltage category CAT · Pollution degree PD2 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | −40 ... +70 °C |
| Ambient Storage Temperature (TA st) | −40 ... +85 °C |
| Mass (m) | 260 g |
| Case Material | Insulating plastic case recognized according to UL 94-V0. |
| Standards & Certifications | |
|---|---|
| for Safety | |
Note: Specifications are taken from the official DHR 400 C420 datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the DHR 400 C420.
Outline dimensions, pin layout and connection diagrams of the DHR 400 C420 are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 260 g |
| Case Material | Insulating plastic case recognized according to UL 94-V0. |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the DHR 400 C420.
Characteristic curve diagrams are not included in the DHR 400 C420 datasheet; the relevant characteristics are the accuracy and dynamic performance data listed below.
Note: For the full set of performance data, refer to the datasheet.
Other models of the dhr Series share the same measurement principle, mounting concept and output interface family.
