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July 2025
778717-66
NI 778717-66, Screw-Terminal, Front-Mounting, TB-2666 PXI Module Relay Terminal Block
Actual item may vary if no part number is provided on quote request.
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Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
Carol Zimme**** Verified Buyer
" Very responsive and helpful, competitive pricing. Good source! "
July 2025
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
National Instruments 778717-66 PXI Module Relay Terminal Block
Part number 778717-66 from National Instruments is the identifying part number for model name TB-2666, which is a Front-Mounting Terminal Block created especially for the PXIe-2566 PXI Relay Switch Module. This terminal block offers engineers quick access to each of the sixteen onboard relays via individual screw terminals, eliminating the need for cables to be connected straight into the front connector. With this design, users can avoid potential damage to the relay hardware due to excessive wear and tear from repeatedly connecting and disconnecting. Having the terminal block mounted flat against the relay module within a PXI chassis also reduces clutter and makes cable management much easier, which is particularly important in densely populated automated test racks where available space and signal quality are critical considerations.
In addition to providing access to the sixteen (16) relays via individual screw terminals, the 778717-66 provides two (2) dedicated inputs/outputs for coordinating the operation of one or more relay switches and/or other instruments/modules involved in a larger test sequence. The ability to route triggers to/from one or more relay switches is highly beneficial in test sequences requiring synchronization of relay closures with other synchronized events, such as multiplexed measurements or sequential signal path tests. The 778717-66 is rated at 150V peak and can withstand transients (impulses) of up to 800V. It offers ample margin for most general-purpose switching, signal routing, and moderate-level power applications common in manufacturing test, product validation, and laboratory-based measurement applications.
Due to its configuration and application, the terminal block is best suited for direct installation into PXI-2566-equipped chassis currently being utilized in automated test environments. Typical uses for the terminal block include functional test stands, production line quality control stations, and research/test stations that require reliable relay switching utilizing easily accessible screw-type terminals versus proprietary connectors. Due to its design and implementation methodology, the terminal block reduces wiring complexity and total system footprint size and increases ease of repair/troubleshooting over cable-based terminal block options. Users creating large-scale PXI-based test architectures will frequently request this terminal block be included as part of their solution requirements when they have requirements for synchronous triggering capabilities, as well as for simple, serviceable relay connectivity.
| Model | 778717-66 |
|---|---|
| Model Name | TB-2666 |
| Part Type | PXI front-mount terminal block |
| Compatible Module | PXIe-2566 |
| Relay Count | 16 |
| Relay Architecture | SPDT Form C (nonlatching) |
| Contact Terminals | NC, NO, COM per relay |
| Max Operating Voltage | 150 V |
| Impulse Rating | 800 V |
| Isolation Resistance | 100 GΩ (channel-to-channel) |
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