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Closed loop (compensated) current transducer
| Primary Residual Current, Measuring Range | -500 ... 500 mA |
| Accuracy (X) | 1.9 % |
| Step Response Time to 90 % of IPN | 50 µs |
| Isolation Test Voltage (50 Hz, 1 min) | 6 kV |
| Reference Voltage @ IP = 0 | 2.495 ... 2.505 V |
| Operating Temperature Range | -40 … 105 °C |
Residual current measurement, Leakage current measurement in transformerless PV inverters, First human contact protection of PV arrays, Failure detection in power sources, Symmetrical fault detection (e.g. after motor inverter), Leakage current detection in stacked DC sources, Single phase or three phase nominal current measurement.
The CTSR 0.3-TP/SP4 is a closed loop (compensated) current transducer from LEM for the electronic measurement of current: DC, AC, pulsed..., with galvanic isolation, delivering an instantaneous output voltage of 0.7 ... 1.7 V.
Typical applications include Residual current measurement, Leakage current measurement in transformerless PV inverters, First human contact protection of PV arrays and Failure detection in power sources.
Key characteristics from the official datasheet: linearity error 0.5 ... 1 % of IPRM; accuracy 1.9 %; operating temperature -40 … 105 °C.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | CTSR |
| Product Reference | CTSR 0.3-TP/SP4 |
| Primary Nominal Current | 300 mA |
| Supply Voltage | 4.75 ... 5.25 V |
| Measurement | current: DC, AC, pulsed... |
| Mounting | PCB Mount |
| Application Domain | Suitable to fulfil VDE 0126-1-1 and UL 1741 |
| Electrical Data — CTSR 0.3-TP/SP4 | |
|---|---|
| Primary Nominal Residual RMS Current (IPRN) | 300 mA |
| Primary Residual Current, Measuring Range (IPRM) | -500 ... 500 mA |
| Supply Voltage (UC) | 4.75 ... 5.25 V |
| Current Consumption (IC) | 17.5 ... 21.6 mA |
| Output Voltage Referred to Vref (Test Current) | 0.7 ... 1.7 V |
| Reference Voltage @ IP = 0 (Vref) | 2.495 ... 2.505 V |
| External Reference Voltage (Vref) | 2.3 ... 4 V |
| Theoretical Sensitivity (Gth) | 4 V/A |
| Accuracy & Dynamic Performance | |
|---|---|
| Sensitivity Error (εG) | -1.6 ... 1.6 % |
| Linearity Error (εL) | 0.5 ... 1 % of IPRM |
| Accuracy (X) | 1.9 % |
| Electrical Offset Current Referred to Primary (IOE) | -24 ... 24 mA |
| Magnetic Offset Current (IOM) | 17 mA |
| Temperature Coefficient of Vref (TCVref) | ±50 ppm/K |
| Temperature Coefficient of VOE (TCVOE) | ±570 ppm/K |
| Temperature Coefficient of G (TCG) | ±230 ppm/K (-40 … 85 °C) · ±400 ppm/K (-40 … 105 °C) |
| Output RMS Noise Voltage (1 Hz … 10 kHz) (Vno) | 6 mV |
| Reaction Time @ 10 % of IPRN (tra) | 7 µs |
| Step Response Time to 90 % of IPN (tr) | 50 µs |
| Frequency Bandwidth (-1 dB) (BW) | 3.5 kHz |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 6 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 11.2 kV |
| Partial Discharge Extinction RMS Voltage @ 10 pC (Ue) | 2.475 kV |
| Clearance (pri.-sec.) dCI | 13.5 mm |
| Creepage Distance (pri.-sec.) dCp | 33.2 mm |
| Comparative Tracking Index (CTI) | 600 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | -40 … 105 °C |
| Ambient Storage Temperature (TA st) | -50 … 105 °C |
| Mass (m) | 55 g |
| Standards & Certifications | |
|---|---|
| EN 50178 | 1997 |
| IEC 61010-1 | 2010 |
| UL 508 | 2010 |
Note: Specifications are taken from the official CTSR 0.3-TP/SP4 datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the CTSR 0.3-TP/SP4.
Outline dimensions, pin layout and connection diagrams of the CTSR 0.3-TP/SP4 are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 55 g |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the CTSR 0.3-TP/SP4.
The characteristic curves of the CTSR 0.3-TP/SP4 from the official datasheet are shown below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Theoretical Sensitivity (Gth) | 4 V/A |
| Sensitivity Error (εG) | -1.6 ... 1.6 % |
| Linearity Error (εL) | 0.5 ... 1 % of IPRM |
| Accuracy (X) | 1.9 % |
| Temperature Coefficient of Vref (TCVref) | ±50 ppm/K |
| Temperature Coefficient of VOE (TCVOE) | ±570 ppm/K |
| Temperature Coefficient of G (TCG) | ±230 ppm/K (-40 … 85 °C) · ±400 ppm/K (-40 … 105 °C) |
| Step Response Time to 90 % of IPN (tr) | 50 µs |
| Frequency Bandwidth (-1 dB) (BW) | 3.5 kHz |
Note: Refer to the datasheet for the complete set of characteristic curves.
Other models of the CTSR Series share the same measurement principle, mounting concept and output interface family.
