NI USB-6525 8 Solid-State Relays, 8 DI, Counter, Ch-to-Ch Isolated

Starting at $ 319 (view pricing options)
  • Eight 60 VDC/30 Vrms, 500 mA solid-state relays and eight ±60 VDC digital inputs
  • One 32-bit, 5 kHz counter
  • 60 VDC channel-to-channel isolation
  • Screw terminals and built-in strain relief
  • Industrial feature set including change detection, power-up states, filters, and watchdog timers
  • NI-DAQmx driver software for highest productivity and performance
  • View Support Resources
The NI USB-6525 is a bus-powered USB device with eight normally open solid-state relay outputs featuring 60 VDC/30 Vrms switching voltage and 500 mA per channel maximum switching current. The solid-state relay outputs are ideal for controlling pumps, valves, motors, and various other industrial actuators. The USB-6525 also features eight ±60 VDC channel-to-channel isolated digital inputs to read from industrial digital sensors. You can use one of the digital input channels as a 5 kHz, 32-bit counter for counting digital pulses and measuring frequency and pulse widths.

Isolated channels break ground loops and offer protection from noise and spikes on external signals. For added ease of use and reliability, the USB-6525 features built-in screw terminals and strain relief.

Industrial Feature Set
NI industrial digital I/O devices offer a set of high-reliability features designed to automate even the most demanding applications. Programmable power-up states provide safe operation when connected to pumps, valves, motors, and relays. Digital I/O watchdog timers detect computer or application crashes and ensure safe recovery. Change detection triggers your application and performs a read operation after a digital event with minimal processor usage. Programmable input filters eliminate glitches/spikes and remove noise.

Driver Software
The USB-6525 works with NI-DAQmx driver software, which features an easy-to-use and intuitive interface for programming. The device, which is compatible with NI LabVIEW, NI LabWindows™/CVI, ANSI C/C++, C#, Visual Basic .NET, and Visual Basic 6.0, works with standard Windows OSs.

The mark LabWindows is used under a license from Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the United States and other countries.

Specifications Documents

  • View Data Sheet

Specifications Summary


NI USB-6525 and Accessories

NI USB-6525 - 779640-01 Qty $ 319 each
Optional Accessories

Subtotal: $ 319

Add to Cart
Request Quote

Service Programs for Hardware

At NI, we produce high-performance hardware and are committed to helping you maintain that performance for years to come. Our three- or five-year service programs for hardware and systems provide the coverage you need while ensuring lowest total cost of ownership over the life of your system:

  • Get up and running faster with system assembly and configuration services
  • Operate on a fixed budget with prepaid repair and calibration services
  • Maintain peak performance with a discounted calibration plan
  • Simply call us to schedule your service—no budget approval needed

To learn more about service programs for hardware and systems, see

Technical Support

With the knowledge, experience, and responsiveness of NI applications engineers in more than 30 languages and 40 countries, we have the technical support resources to ensure your success. Through our standard NI technical support program, we can help you:

  • Consult on how to use NI products
  • Overcome development challenges
  • Quickly resolve issues pre- or post-deployment

To access NI technical support services for your hardware, visit

Training and Certification

With extensive training options for new and experienced users, we can help you reduce development time and costs through faster learning and increased productivity with your NI hardware and systems. Gain the skills you need to design and develop high-quality applications:

  • Learn recommended techniques to reduce development time and improve application performance and scalability
  • Leverage more than 40 training courses taught by NI and industry experts
  • Attend training in a variety of formats, including online, virtual, and classroom settings

To find training courses for your hardware, visit

Consulting and Integration

NI and the extensive network of NI Alliance Partners provide a wide range of professional services so that together, we can assist you with the design, development, and deployment of even the most complex systems. Take advantage of the team’s in-depth knowledge of NI products and applications with the following services:

  • Prototyping and feasibility analysis
  • Startup, consulting, and development assistance
  • System integration
  • Migration and upgrade assistance

For more information on NI professional services and the Alliance Partner Network, see