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3.0 Version Ttl Modbus-Rtu Voltage Current Frequency Power

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PZEM-004T 3.0 Version TTL Modbus-RTU Voltage Current Frequency Power Factor Energy Power Meter AC Single Phase 100A Ammeter

We provide the software to connect it with the PC. If you want to connect it with other terminal device such as PLC,SCM and so on, please prepare the fitable cable and write the program by yourself.

This document describes the specification of the PZEM-004T AC communication module, the module is mainly used for measuring AC voltage, current, active power, frequency, power factor and active energy, the module is without display function, the data is read through the TTL interface.

PZEM-004T-10A: Measuring Range 10A (Built-in Shunt)

PZEM-004T-100A: Measuring Range 100A (external transformer)

If you need the software, please download it via this link:


Very Important Notification:

For this product PZEM-004T, we have the update version to replace the old version. The old version has been sold out and no produce anymore. The update information as following:

1. the new version has the same size and TTL port as before

2. the software is new, we have English software as same as the PZEM-014,016, The communication protocol change to be Modbus–RTU, the display interface is changed. now it can test Voltage ,Current, Power, Power factor, Frequency and Energy 6 parameters.

3. the new version has higher precision, faster refresh speed and the more stability communication than the old version.

4. The new version increase a set for 0-10A

4. This is the module with the very nice outcase.

If there is any question, welcome to contact the service to get more information.

1. Working voltage: 80 ~ 260VAC

2. Test voltage: 80 ~ 260VAC

3. Rated power: 100A/22000W

4. Operating frequency: 45-65Hz

5. Measurement accuracy: 1.0 grade


  1. Voltage

1.1.1 Measuring range:80~260V

1.1.2 Resolution: 0.1V

1.1.3 Measurement accuracy: 0.5%

1.2 Current

1.2.1 Measuring range: 0~10A(PZEM-004T-10A); 0~100A(PZEM-004T-100A)

1.2.2 Starting measure current: 0.01A(PZEM-004T-10A); 0.02A(PZEM-004T-100A)

1.2.3 Resolution: 0.001A

1.2.4 Measurement accuracy: 0.5%

1.3 Active power

1.3.1 Measuring range: 0~2.3kW(PZEM-004T-10A); 0~23kW(PZEM-004T-100A)

1.3.2 Starting measure power: 0.4W

1.3.3 Resolution: 0.1W

1.3.4 Display format:

<1000W, it display one decimal, such as: 999.9W

≥1000W, it display only integer, such as: 1000W

1.3.5 Measurement accuracy: 0.5%

1.4 Power factor

1.4.1 Measuring range: 0.00~1.00

1.4.2 Resolution: 0.01

1.4.3 Measurement accuracy: 1%

1.5 Frequency

1.5.1 Measuring range: 45Hz~65Hz

1.5.2 Resolution: 0.1Hz

1.5.3 Measurement accuracy: 0.5%

1.6 Active energy

1.6.1 Measuring range: 0~9999.99kWh

1.6.2 Resolution: 1Wh

1.6.3 Measurement accuracy: 0.5%

1.6.4 Display format:

<10kWh, the display unit is Wh(1kWh=1000Wh), such as: 9999Wh

≥10kWh, the display unit is kWh, such as: 9999.99kWh

1.6.5 Reset energy: use software to reset.

1.7 Over power alarm

Active power threshold can be set, when the measured active power exceeds the threshold, it can alarm

1.8 Communication interface

RS485 interface

1 Communication protocol

1.1 Physical layer protocol

Physical layer use UART to TTL communication interface

Baud rate is 9600, 8 data bits, 1 stop bit, no parity

100% new brand high quality

1 x PZEM-004T AC Voltmeter Ammeter with outcase

1 x split CT+USB cable


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3. Payment must be received within 5 business days of auction closing.

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1. The default shipping is by China Post Registered Air Mail.

2. Item will be shipped within 2-3 working days after full payment is received.

3. Buyers need to provide the correct address, we’ll not be responsible for item loss because of wrong or undeliverable address, and we do not accept the dispute

4. The extra fee occured when the product pass through the customs should be paid by buyer.

5. For considering environmental protection, we don't usually send paper specification, if you need it, please find it on the product description page or contact with us.

Warranty and Guarantee

1. All the products we are selling include factory warranty, don’t cover items that have been abused, burned and damaged in any form.

2. Please contact us if you have NOT received item in 30 days, we will check it with post office ASAP.

3. In the unlikely event that your product is faulty in anyway, you must contact us ASAP and then return it within 7 days of receipt. The postage and packaging fee will NOT be refunded.

4. If you don't satisfy with our product, please return it within 14 days for a replacement or money back. But the items must be back in Factory Condition. This includes packaging, inserts, manuals etc. Please contact us and double check the return address before you return it.

5. We will not be responsible for the delivery or insurance charges incurred in returning item back to us.

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Customer satisfaction is very important to us. If you have any questions, please do not hesitate to contact us anytime before and after your purchase, our Customer Service staffs welcome you to email .We strive to answer all questions and resolve any problems as quickly as possible.

We try our best to reply to your emails as soon as possible, however, due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately.
Please allow 1-2 business days for us to response. If you do not receive any reply from us, please check your email ensuring your mailbox has not reached full size.

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Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

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How long does shipping take?

Shipping time varies by location. These are our estimates:
Location *Estimated Shipping Time
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Canada, Europe 10-30 Business days
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Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

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My tracking says “no information available at the moment”.

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For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.


Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

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We do not issue the refund if:

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  • Other exceptional circumstances outside the control of

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

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We try our best to make your shopping experience not only pleasant, seamless and hassle-free, but also secure.

Enjoy flexible international shipping services that currently operate in over 200 countries across the world.

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