# Current Transducer, CTSR Series, PCB, -500mA to 500mA, 1.9 %, Voltage Output, 4.75 Vdc to 5.25 Vdc
**URL**: https://novapart.co/products/CTSR%200.3-P/current-transducer-ctsr-series-pcb-500ma-to-19
**SKU**: CTSR 0.3-P
**Manufacturer**: LEM
**Category**: Sensors & Transducers || Sensors || Current Sensors
**Price**: €32.2600
**Stock**: 100+
**Lead Time**: 78 days (indicative)
## Description
Sensor Output:Voltage; Supply Voltage DC Min:4.75V; Supply Voltage DC Max:5.25V; Current Measuring Range DC:-500mA to 500mA; Current Measuring Range AC:-500mA to 500mA; Response T
## Specifications
| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| Accuracy | ± 1.9% |
| Accuracy % | 1.9% |
| Product Range | CTSR Series |
| Response Time | 7µs |
| Primary Current | 300mA |
| Sensor Mounting | Through Hole |
| Measured Current | AC / DC / Pulsed |
| Sensor Output Type | Voltage |
| Supply Voltage Range | 4.75V to 5.25V |
| Secondary Signal Type | 2.5V |
| Supply Voltage Dc Max | 5.25V |
| Supply Voltage Dc Min | 4.75V |
| Current Sensor Technology | Closed Loop, Flux Gate |
| Operating Temperature Max | 105°C |
| Operating Temperature Min | -40°C |
| Current Measuring Range Ac | -500mA to 500mA |
| Current Measuring Range Dc | -500mA to 500mA |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:2664154/)
## **Current Transducer CTSR series**
## _I_ **= 300, 600 mA PRN**
## **Ref: CTSR 0.3-P, CTSR 0.6-P**
For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary circuit and the secondary circuit.
## **Features**
- ●Closed loop (compensated) current transducer
- ●Voltage output
- ●Single supply voltage
- ●PCB mounting.
## **Advantages**
## **Applications**
- ●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)
- ●High accuracy
- ●Very low offset drift over temperature
- ●Wide aperture
- ●High overload capability
- ●High insulation capability
- ●Reference pin with two modes, Ref In and Ref Out
- ●Degauss and test functions.
- ●Leakage current detection in stacked DC sources
- ●Single phase or three phase nominal current measurement up to ± 30 A per wire (DC or AC).
## **Standards**
- ●EN 50178: 1997
- ●IEC 61010-1: 2010
- ●UL 508: 2010.
## **Application Domain**
- ●Industrial
- ●Suitable to fulfil VDE 0126-1-1 and UL 1741.
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N°97.G9.A2.000.0, N°97.G9.G6.000.0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
26September2013/version 6
www.lem.com
**CTSR Series**
## **Absolute maximum ratings**
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**----- Start of picture text -----**
Parameter Symbol Unit Value
**----- End of picture text -----**
|**Parameter**|**Symbol**|**Unit**|**Value**|
|---|---|---|---|
|||||
|Supply voltage|_U_C|V|7|
|Primary conductor temperature|_T_B|°C|110|
|Impulse overload (100 µs, 500 A/µs)|_Î_P|A|3300|
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability.
## **UL 508: Ratings and assumptions of certification**
File # E189713 Volume: 2 Section: 3
## **Standards**
- CSA C22.2 NO. 14-10 INDUSTRIAL CONTROL EQUIPMENT - Edition 11 - Revision Date 2011/08/01
- UL 508 STANDARD FOR INDUSTRIAL CONTROL EQUIPMENT - Edition 17 - Revision Date 2010/04/15
## **Ratings**
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**----- Start of picture text -----**
Parameter Symbol Unit Value Version P Value Version TP
**----- End of picture text -----**
|**Parameter**|**Symbol**|**Unit**|**Value Version P**|**Value Version TP**|
|---|---|---|---|---|
||||||
|Primary involved potential*||V AC/DC|600|1000|
|Max surrounding air temperature|_T_A|°C|105||
|Primary current|_I_P|A|According to series primary currents||
|Secondary supply voltage|_U_C|V DC|7||
|Output voltage|_V_out|V|0 to 7||
- Enviromental: For use in Pollution degree 3.
## **Conditions of acceptability**
_When installed in the end-use equipment, consideration shall be given to the following:_
- _1 - A suitable enclosure shall be provided in the end-use application._
- _2 - The insulation between the primary and the secondary sensing circuits were evaluated with 4250 V AC for CTSR 0.6-TP/ SP and 2200 V AC for CTSR 0.6-P in dielectric voltage withstand test._
- _5 - CTSR series is intended to be mounted on the printed wiring board of the end-use equipment._
- _7 - The uninsulated live parts of primary feeder and secondary circuit clearance spacing of Model CTSR XX-P series shall maintain at least 5.5 mm apart._
- _8 - Primary feeder of the devices shall be connected after an overvoltage device or system which has been evaluated by the Standard for Transient Voltage Surge Suppressors, UL 1449._
## **Marking**
Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL's Follow-Up Service. Always look for the Mark on the product.
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**CTSR Series**
## **Insulation coordination**
**==> picture [512 x 25] intentionally omitted <==**
**----- Start of picture text -----**
Parameter Symbol Unit Value Comment
**----- End of picture text -----**
|**Parameter**|**Symbol**|**Unit**|**Value**|**Comment**|
|---|---|---|---|---|
||||||
|Rms voltage for AC insulation test 50 Hz/1 min|_U_d|kV|5.4||
|Impulse withstand voltage 1.2/50 µs|_Û_W|kV|10.1||
|Partial discharge extinction rms voltage @ 10 pC|_U_e|kV|1.65||
|Clearance (pri. - sec.)|_d_CI|mm|11|Shortest distance through
air|
|Creepage distance (pri. - sec.)|_d_Cp|mm|11|Shortest path along device
body|
|Comparative tracking index|_CTI_|V|600||
|Application example|-|V|1000|Reinforced insulation, CAT
III, PD2 non uniform feld
according to EN 50178|
|Application example|-|V|600|Reinforced insulation, CAT
III, PD3 non uniform feld
according to EN 50178,
IEC 61010|
## **Environmental and mechanical characteristics**
|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
|Ambient operating temperature|_T_A|°C|-40||105||
|Ambient storage temperature|_T_S|°C|-50||105||
|Mass|_m_|g||28|||
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26September2013/version 6
**CTSR Series**
## **Electrical data CTSR 0.3-P**
At _T_ A = 25 °C, _U_ C = ± 5 V, output voltage referred to _V_ ref, unless otherwise noted (see Min., Max., typical definition paragraph) in page 10.
**==> picture [513 x 22] intentionally omitted <==**
**----- Start of picture text -----**
Parameter Symbol Unit Min Typ Max Comment
**----- End of picture text -----**
|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Primary nominal residual rms current|_I_PRN|mA||300|||
|Primary residual current, measuring range|_I_PRM|mA|-500||500||
|Supply voltage|_U_C|V|4.75|5|5.25||
|Current consumption|_I_C|mA|16|17.5|21.6|+_I_P(mA)/_N_S
With_N_S= 1000 turns
- 40 .. 105 °C|
|Output voltage referred to GND
(during Degauss cycle)|_V_out|V||0.3|0.5|Note1)|
|Output voltage referred to_V_ref
(test current)|_V_out|V|0.7|1.2|1.7|Note1)|
|Reference voltage @_I_P= 0|_V_ref|V|2.495|2.5|2.505|Internal reference|
|External reference voltage|_V_ref|V|2.3||4|Internal reference of
_V_refinput = 499 Ω
Note1)|
|Electrical offset current
referred to primary (Note2))|_I_OE|mA|-24|7|24||
|Temperature coeffcient of_V_ref@_I_P= 0|_TCV_ref|ppm/K|||±50|- 40 .. 105 °C|
|Temperature coeffcient of_V_OE@_I_P= 0|_TCV_OE|ppm/K|||±570|ppm/K of 2.5 V
- 40 .. 105 °C|
|Theoretical sensitivity|_G_th|V/A||4|||
|Sensitivity error (Note2))|_εG_|%|-1.6|0.5|1.6|_R_L> 500 kΩ|
|Temperature coeffcient of_G_|_TCG_|ppm/K|||±230|- 40 .. 85 °C|
||||||±400|- 40 .. 105 °C|
|Linearity error|_ε_L|% of_I_PRM||0.5|1||
|Magnetic offset current (1000 x_I_PRN)
referred to primary|_I_OM|mA||17|||
|Output rms voltage noise (spectral
density) 1 .. 10 kHz referred to primary|_V_no|mV||6||_R_L> 500 kΩ|
|Reaction time @ 10 % of_I_PRN|_t_ra|µs||7||_R_L> 500 kΩ,
d_i_/d_t_> 5 A/µs|
|Response time @ 90 % of_I_PN|_t_r|µs||50||_R_L> 500 kΩ,
d_i_/d_t_> 5 A/µs|
|Frequency bandwidth (- 1 dB)|_BW_|kHz||3.5||_R_L> 500 kΩ|
|Accuracy (Note3))|_X_|%|||1.9|= (_ε_G
2+_ε_L 2)1/2|
Notes: 1) See “Application information” section.
2) Only with a primary nominal residual current, see paragraph “Primary nominal residual current and primary nominal current”.
> 3) Accuracy @ _T_ A and _I_ P: _X_ TA = ( _X_ 2 + ( _TCG_ •100•( _T_ A - 25))2 + ( _TCV_ OE•2.5•( _T_ A - 25 )/ _G_ th•100/ _I_ P )2)1/2.
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
26September2013/version 6
**CTSR Series**
## **Typical performance characteristics CTSR 0.3-P**
**==> picture [365 x 131] intentionally omitted <==**
**----- Start of picture text -----**
| Sa SSS N
Frequency (Hz)
Phase (°)
Relative sensitivity (dB)
**----- End of picture text -----**
_Figure 1: Frequency response_
_Figure 2: Output noise, spectral density_
_Figure 3: Output noise, cumulated rms_
_Figure 4: Typical step response_
_Figure 5: Typical step response_
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26September2013/version 6
**CTSR Series**
## **Electrical data CTSR 0.6-P**
At _T_ A = 25 °C, _U_ C = ± 5 V, output voltage referred to _V_ ref, unless otherwise noted (see Min., Max., typical definition paragraph) in page 10.
**==> picture [512 x 22] intentionally omitted <==**
**----- Start of picture text -----**
Parameter Symbol Unit Min Typ Max Comment
**----- End of picture text -----**
|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Primary nominal residual rms current|_I_PRN|mA||600|||
|Primary residual current, measuring range|_I_PRM|mA|-850||850||
|Supply voltage|_U_C|V|4.75|5|5.25||
|Current consumption|_I_C|mA|16|17.5|21.6|+_I_P(mA)/_N_S
With_N_S= 1000 turns
- 40 .. 105 °C|
|Output voltage referred to GND
(during Degauss cycle)|_V_out|V||0.3|0.5|Note1)|
|Output voltage referred to_V_REF
(test current)|_V_out|V|0.4|0.75|1.1|Note1)|
|Reference voltage @_I_P= 0|_V_ref|V|2.495|2.5|2.505|Internal reference|
|External reference voltage|_V_ref|V|2.3||4|Internal reference of
_V_refinput = 499 Ω
Note1)|
|Electrical offset current
referred to primary (Note2))|_I_OE|mA|-24|4.2|24||
|Temperature coeffcient of_V_ref@_I_P= 0|_TCV_ref|ppm/K|||±50|- 40 .. 105 °C|
|Temperature coeffcient of_V_OE@_I_P= 0|_TCV_OE|ppm/K|||±520|ppm/K of 2.5 V
- 40 .. 105 °C|
|Theoretical sensitivity|_G_th|V/A||2.476|||
|Sensitivity error (Note2))|_εG_|%|-0.7|0.3|0.7|_R_L> 500 kΩ|
|Temperature coeffcient of_G_|_TCG_|ppm/K|||±100|- 40 .. 105 °C|
|Linearity error|_ε_L|% of_I_PRM||0.4|1.3||
|Magnetic offset current (1000 x_I_PRN)
referred to primary|_I_OM|mA||17|||
|Output rms voltage noise (spectral
density) 1 .. 10 kHz referred to primary|_V_no|mV||4||_R_L> 500 kΩ|
|Reaction time @ 10 % of_I_PRN|_t_ra|µs||5||_R_L> 500 kΩ,
d_i_/d_t_> 5 A/µs|
|Response time @ 90 % of_I_PN|_t_r|µs||30||_R_L> 500 kΩ,
d_i_/d_t_> 5 A/µs|
|Frequency bandwidth (- 1 dB)|_BW_|kHz||9.5||_R_L> 500 kΩ|
|Accuracy (Note3))|_X_|%|||1.5|= (_ε_G
2+_ε_L 2)1/2|
Notes: 1) See “Application information” section.
2) Only with a primary nominal residual current, see paragraph “Primary nominal residual current and primary nominal current”.
> 3) Accuracy @ _T_ A and _I_ P: _X_ TA = ( _X_ 2 + ( _TCG_ •100•( _T_ A - 25))2 + ( _TCV_ OE•2.5•( _T_ A - 25 )/ _G_ th•100/ _I_ P )2)1/2.
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
26September2013/version 6
**CTSR Series**
## **Typical performance characteristics CTSR 0.6-P**
**==> picture [372 x 133] intentionally omitted <==**
**----- Start of picture text -----**
SS SS SSS
| Wt SSS \
| SN
| we
Frequency (Hz)
Phase (°)
Relative sensitivity (dB)
**----- End of picture text -----**
_Figure 6: Frequency response_
**==> picture [473 x 164] intentionally omitted <==**
**----- Start of picture text -----**
Noise voltage spectral density of VM Cumulated RMS noise voltage of VM
-60 Device: CTSR 0.6-P #05-61 10-1 Device: CTSR 0.6-P #05-61
-65
-70 aU ai nef enenfrbed Ld mmnedefendedebeb eenedeomnbecdocdd HE Ee LH 10-2 a id ato i ma EEELEE ee een _ i mi mi fetta il i Lae
-75
-80-85 emeeeimlda ileH Loi LLELnoe PoE ELLY PoEELGHi|| 10-3 eeeBod gE EEELL itea etPoriiiiil EOEace
-90 10-4
-95
-100 10-5
-105
-110100 101 102 103 104 105 10-6100 101 102 103 104 105
f (Hz) f c (Hz)
(V) V n
(dBVrms/rtHz) v n
**----- End of picture text -----**
_Figure 7: Output noise, spectral density_
_Figure 8: Output noise, cumulated rms_
_Figure 9: Typical step response_
_Figure 10: Typical step response_
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26September2013/version 6
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**CTSR Series**
## **Application information**
## **Filtering, decoupling CTSR transducer**
## **Supply voltage** _**U**_ **c (5 V):**
The CTSR transducers have internal decoupling capacitors, but in the case of a power supply track on the application PCB having a high impedance, it is advised to provide local decoupling, 100 nF or more, located close to the transducer.
## **Reference** _V_ **ref**
Ripple present on the _V_ ref pin can be filtered with a low value of capacitance because of the internal 499 ohm series resistance. The CTSR transducers have an internal capacitor of 22 nF between _V_ ref pin and Gnd pin and the maximum filter capacitance value which could be added is 1 µF. Adding a larger decoupling capacitor will increase the activation delay of degauss.
## **Output** _V_ **out**
The CTSR transducers have an internal low pass filter 470 ohm/22 nF; if a decoupling capacitor is added on _V_ out pin, the bandwidth and the response time will be affected. In case of short circuit, the transducer CTSR can source or sink up to a maximum of 10 mA on its output _V_ out.
## **Using an external reference voltage**
If the _V_ ref pin of the transducer is not used it could be either left unconnected or filtered according to the previous paragraph “Reference _V_ ref”.
The _V_ ref pin has two modes Ref out and Ref In:
- In the Ref out mode the 2.5 V internal precision reference is used by the transducer as the reference point for bipolar measurements; this internal reference is connected to the _V_ ref pin of the transducer through a 499 ohms resistor. It tolerates sink or source currents up to ± 5 mA, but the 499 ohms resistor prevents this current to exceed these limits.
- In the Ref In mode, an external reference voltage is connected to the _V_ REF pin; this voltage is specified in the range 2.3 to 4 V and is directly used by the transducer as the reference point for measurements. The external reference voltage _V_ ref must be able:
- _Vref_ − 5.2
- o either to source a typical current of 499 , the maximum value will be 3 mA when _V_ ref = 4 V.
- or to sink a typical current of 5.2499 − _Vref_ , the maximum value will be 0.4 mA when _V_ ref = 2.3 V.
The following graphs show how the measuring range of the transducer depends on the external reference voltage value _V_ ref ( _U_ c = 5 V).
**==> picture [240 x 230] intentionally omitted <==**
**----- Start of picture text -----**
600
I PRM 500 mA
400
200
0
-200
-400
-600
2 3 4
V ref (V)
Upper limit: I P= 500 mA ( V ref = 2.3 .. 2.625 V)
Upper limit: I P= -250* V ref+1156.25 ( V ref = 2.625 .. 4 V)
Lower limit: I P= -250* V ref+93.75 ( V ref= 2.3 .. 2.375 V)
Lower limit: I P= -500 mA ( V ref = 2.375 .. 4 V)
(mA)
PRM
I
**----- End of picture text -----**
**==> picture [238 x 223] intentionally omitted <==**
**----- Start of picture text -----**
1000
800 I PRM 850 mA
600
400
200
0
-200
-400
-600
-800
-1000
2 3 4
V ref (V)
Upper limit: I P= 850 mA ( V ref = 2.3 .. 2.52 V)
Upper limit: I P= -403.88* V ref+1867.93 ( V ref = 2.52 .. 4 V)
Lower limit: I P= -403.88* V ref+151.45 ( V ref = 2.3 .. 2.48 V)
Lower limit: I P= -850 mA ( V ref = 2.48 .. 4 V)
(mA)
PRM
I
**----- End of picture text -----**
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## **CTSR Series**
## **Primary nominal residual current and primary nominal current**
The primary nominal residual current is the sum of the instantaneous values of all currents flowing through the aperture of the transducer.
The primary nominal current is the current flowing through any conductor placed into the aperture of the transducer. The presence of a primary nominal current DC or AC leads to an additional uncertainty.
For example, with a primary nominal current of 30 A the uncertainty referred to primary is typical 4.3 mA.
## **CTSR transducer in Test mode**
When the transducer exhibits a fixed value (see specification) as if it measured a primary test current. _V_ ref pin is forced at a low level voltage between 0 and 1 V and is maintained at this level, the output voltage _V_ out of CTSR The activation time of test mode is min 30 ms. The CTSR transducer can be maintained in test mode as long as needed for checking that it is fully operating.
## **CTSR transducer in Degauss mode**
The CTSR transducers go in degauss mode automatically at each power on or on demand by using the _V_ ref pin. At power on:
A degauss is automatically generated at each power on of the CTSR transducer; during degaussing the output voltage _V_ out is maintained at 0.3 V typ. (max 0.5 V). After c.a. 110 ms, the output voltage _V_ out is released and takes the normal operation level in relation with the measured primary current.
## Using _V_ REF pin:
When the pin _V_ ref is released from the Low level voltage defined in the Test mode above, there is a rising edge on _V_ ref which generates an automatic degauss.
The activation of degauss takes typically 40 µs after releasing _V_ ref pin, then degauss lasts typically 110 ms.
**==> picture [306 x 174] intentionally omitted <==**
**----- Start of picture text -----**
Summary of test and degauss modes at V ref = 2.5 V
V ref
Measuring Test mode Degauss mode Measuring
2.5 V
1 V
Vout referred to V ref
1.7 V (0.3-P) or 110 ms
1.1 V (0.6-P)
0.7 V (0.3-P) or
0.4 V (0.6-P)
Measured I PR 30 ms -2 V
-2.5 V Measured I PR
**----- End of picture text -----**
## **Isolation around the CTSR transducer housing**
Due to the joint between the case and the cover of the CTSR transducer, there is some isolation distance to respect when primary conductors pass around the CTSR housing.
The figure below shows the joint and the apertures where the clearance between the secondary part inside the CTSR transducer and the surface of the housing is 3 mm (label E).
**==> picture [197 x 131] intentionally omitted <==**
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**CTSR Series**
## **PCB footprint CTSR series**
**==> picture [191 x 151] intentionally omitted <==**
## **Assembly on PCB**
- ●Recommended PCB hole diameter
- ●Maximum PCB thickness
- ●Wave soldering profile No clean process only
1.2 mm for secondary pin 2 mm for retention pin 2.4 mm maximum 260 °C, 10 s
The two retention pins inserted into the case of the transducer are electrically isolated by the housing. Because one of them is close to the secondary connector, it is recommended to connect both to the secondary side GND or + _U_ c.
Consequently any primary conductor must be placed in the PCB at the requested isolation distance regarding these secondary sides (see also paragraph “Isolation around the CTSR transducer housing”).
## **Definition of typical, minimum and maximum values**
Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shown in “typical” graphs.
On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower limits and a probability for measured values to lie within this interval.
Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that the probability for values of samples to lie in this interval is 99.73 %.
For a normal (Gaussian) distribution, this corresponds to an interval between -3 sigma and +3 sigma. If “typical” values are not obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to an interval between -sigma and +sigma for a normal distribution.
Typical, maximal and minimal values are determined during the initial characterization of a product.
## **Safety**
This transducer must be used in limited-energy secondary circuits according to IEC 61010-1.
This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturer’s operating instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a build-in device, whose conducting parts must be inaccessible after installation. A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
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**CTSR Series**
## **Dimensions** (in mm, general tolerance ± 0.3 mm)
**==> picture [512 x 493] intentionally omitted <==**
**----- Start of picture text -----**
Connection
out
U C
R M V ref
V out Out
in
**----- End of picture text -----**
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## Links
- [View this product on Novapart](https://novapart.co/products/CTSR%200.3-P/current-transducer-ctsr-series-pcb-500ma-to-19)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/lem/ctsr-0-3-p/current-sensor-0-3a-voltage-o/dp/2664154)
---
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