What is the Additional Feature ?

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

What is the Terminal Form

Occurring at or forming the end of a series, succession, or the like; closing; concluding.

What is the Terminal Pitch

The center distance from one pole to the next.

What is the Max Output Voltage

The maximum output voltage refers to the dynamic area beyond which the output is saturated in the positive or negative direction, and is limited according to the load resistance value.

What is the Packaging

semiconductor package is a shell that encases and protects semiconductor components or integrated circuits, made from metal, plastic, glass, or ceramic.

Deyee Tech Limited - Global Electronic Component Distributor | IC, Aerospace, Automotive Electronics

Name: CTSR 0.3-P
Brand: LEM USA Inc.
SKU: CTSR 0.3-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Home > Products > Sensors, Transducers > Current Transducers

LEM USA Inc. CTSR 0.3-P

Part No.:: CTSR 0.3-P

Manufacturer:: LEM USA Inc.

Category:: Current Transducers

Package:: Module

Datasheet:: CTSR 0.3-P.pdf

Description:: SENSOR CURRENT FLUX 300MA AC/DC

Quantity:: RFQ Add To RFQ list Buy Now Add To Cart

Unit Price:$0

Ext Price:$0

Product details

Details
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The LEM CTSR 0.3-P is a high-precision fluxgate-based current sensor designed for residual (leakage) current detection

in industrial and renewable energy applications.

It operates on a closed-loop principle,

ensuring high accuracy and stability for measuring small AC, DC, or pulsed currents.

Key Features:

Measurement Principle: Fluxgate technology with galvanic isolation (5.4 kV RMS / 50 Hz / 1 min) .
Current Range:
- Nominal current (I<sub>PN</sub>): 300 mA RMS
- Measurement range: Up to 500 mA (some variants up to 850 mA) .
Accuracy:
- ±1.9% at +25°C (excluding offset drift) .
Frequency Response: DC to 9.5 kHz (-1dB), suitable for detecting fast transients .
Power Supply: Single +5V DC (unipolar), low power consumption (~17.8 mA) .
Output Signal: Voltage output (1.2V at full scale) .
Self-Test & Demagnetization: Built-in diagnostics to verify sensor health .
Mechanical Design:
- Large aperture (Ø20.1 mm) for easy cable routing .
- PCB-mountable, compact design (28g weight) .
- High insulation: 11 mm creepage/clearance distance .
Operating Temperature: -40°C to +105°C, suitable for harsh environments .

Primary Applications

The CTSR 0.3-P is widely used in safety-critical systems where residual current detection is essential:

Solar Power Systems
- Ground fault detection in PV inverters (complies with VDE 0126-1-1, UL 1741, IEC 60950-1) .
- Protection against electric shock in solar arrays .
Industrial Power Electronics
- Uninterruptible Power Supplies (UPS) .
- Switch-mode power supplies (SMPS) fault detection .
- Motor drives & converters (symmetrical fault detection) .
Electrical Safety Systems
- Ground leakage monitoring in industrial equipment .
- Personnel protection in high-voltage installations .
Medical & Telecom Equipment
- Residual current monitoring in isolated power systems .

Alternative/Similar Models

1. Within the CTSR Series (LEM)

Model	Nominal Current (I<sub>PN</sub>)	Accuracy (±%)	Output Signal	Key Differences
CTSR 0.3-P/SP1	300 mA	1.5%	0.743V	Higher accuracy variant
CTSR 0.6-P	600 mA	1.5%	1.486V	Higher current range
CTSR 1-P	1 A	1.9%	1.2V	Extended range for larger leakage currents
CTSR 0.3-TP	300 mA	1.9%	1.2V	Includes primary busbar for easier installation

2. Competing Models from Other Brands

Danisense DSF-300mA: High-precision fluxgate sensor (0.1% accuracy).
Allegro ACS712: Hall-effect-based, lower accuracy (±3%) but cheaper.
PEM CWT Ultra Mini: Rogowski coil-based, better for high-frequency AC.

Key Differentiators of CTSR 0.3-P

✔ Self-test capability (rare in competing models) .
✔ Wide temperature range (-40°C to +105°C) for industrial use .
✔ High overload tolerance (3300A for 100ms) .
✔ Compliance with safety standards (UL, VDE, IEC) .

Design Considerations

PCB Layout: Ensure minimal noise for accurate small-current measurement.
Power Supply Stability: Requires clean +5V DC (±5%).
Self-Test Functionality: Useful for predictive maintenance

Packaging:: Bulk

Series:: CTSR

ProductStatus:: Active

ForMeasuring:: AC/DC

SensorType:: Flux Gate, Closed Loop

Current-Sensing:: 300mA

NumberofChannels:: 1

Output:: Ratiometric, Voltage

Sensitivity:: -

Frequency:: 3.5kHz

Linearity:: ±0.5%

Accuracy:: ±1.9%

Voltage-Supply:: 4.75V ~ 5.25V

ResponseTime:: 50µs

Current-Supply(Max):: 21.6mA

OperatingTemperature:: -40°C ~ 105°C

Polarization:: Bidirectional

MountingType:: PCB, Through Hole

Category:: Current Transducers

Datasheet:: CTSR 0.3-P.pdf

1. How to order CTSR 0.3-P on Deyee Tech Limited?

Currently, Deyee Tech Limited only provide peer-to-peer order processing. While you submit the RFQ, our professional agent will contact you with the competitive prices in the global market, and our agent will prompt you to finish the order if you accept our offers.

2. How does Deyee Tech Limited guarantee that CTSR 0.3-P is from the original manufacturer or authorized agents?

We have a professional and experienced quality control team to strictly verify and test the CTSR 0.3-P. All suppliers must pass our qualification reviews before they can publish their products including CTSR 0.3-P on Deyee Tech Limited; we pay more attention to the channels and quality of CTSR 0.3-P products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.

3. Are the CTSR 0.3-P price and inventory displayed accurate?

The price and inventory of CTSR 0.3-P fluctuates frequently and cannot be updated in time, it will be updated periodically within 24 hours. And, our quotation usually expires after 5 days.

4. What forms of payment are accepted?

Wire Transfer, PayPal, Alipay, Wechat, Credit Card, Western Union, MoneyGram, and Escrow are all acceptable.

Warm Tips: Some orders in certain payment forms may require handling fee.

5. How is the shipping arranged?

Customers can choose industry-leading freight companies, including DHL, UPS, FedEx, TNT, and Registered Mail. Shipping insurance is also available.

Once your order has been processed for shipment, our salesperson will send you an email advising you of the shipping status and tracking number.

Warm Tips: It may take up to 24 hours for the carriers to display tracking information. Usually, express delivery takes 3-5 days, and registered mail takes 25-60 days.

6. What is the process for return or replacement of CTSR 0.3-P?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the CTSR 0.3-P we delivered, we will accept the replacement or return of the CTSR 0.3-P only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of CTSR 0.3-P.

(3)The PartNo is unused and only in the original unpacked packaging.

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations

7.How to contact us to get technical supports, such as CTSR 0.3-P pin diagram, CTSR 0.3-P datasheet?

If you need any after-sales service, please do not hesitate to contact us.

Image
Part Number	CTSR 0.3-P	CTSR 0.6-P	CTSR 0.3-TP/SP4	CTSR 0.6-TP/SP2
Manufacturer	LEM USA Inc.	LEM USA Inc.	LEM USA Inc.	LEM USA Inc.
Packaging	Bulk	Bulk	Bulk	Bulk
Series	CTSR	CTSR	CTSR	CTSR
ProductStatus	Active	Active	Active	Active
ForMeasuring	AC/DC	AC/DC	AC/DC	AC/DC
SensorType	Flux Gate, Closed Loop	Flux Gate, Closed Loop	Flux Gate, Closed Loop	Flux Gate, Closed Loop
Current-Sensing	300mA	300mA	300mA	300mA
NumberofChannels	1	1	1	1
Output	Ratiometric, Voltage	Ratiometric, Voltage	Ratiometric, Voltage	Ratiometric, Voltage
Sensitivity	-	-	-	-
Frequency	3.5kHz	3.5kHz	3.5kHz	3.5kHz
Linearity	±0.5%	±0.5%	±0.5%	±0.5%
Accuracy	±1.9%	±1.9%	±1.9%	±1.9%
Voltage-Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
ResponseTime	50µs	50µs	50µs	50µs
Current-Supply(Max)	21.6mA	21.6mA	21.6mA	21.6mA
OperatingTemperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Polarization	Bidirectional	Bidirectional	Bidirectional	Bidirectional
MountingType	PCB, Through Hole	PCB, Through Hole	PCB, Through Hole	PCB, Through Hole