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July 2025
cFP-RLY-421 Request for Availability
cFP-RLY-421, 8 Input Channel, Relay Output Module for Compact FieldPoint
Rated 4.6/5 | 18 ratings
Actual item may vary if no part number is provided on quote request.
✔ 2 Year Warranty Included
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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 cFP-RLY-421 Relay Output Module for Compact FieldPoint
The NI cFP-RLY-421 (Part Number: 777318-421) has eight SPST electromechanical relays. This Relay Output Module is designed to be mounted on a cFP-BP-x Compact FieldPoint backplane, which delivers operational power to the module. The cFP-CB-x Connector Block has connections for the eight relay channels on the cFP-RLY-421 module, as well as for an external supply to power field instruments. If this Relay Output Module is being utilized for hazardous voltage application, then they must use the cFP-CB-1 Connector Block or an appropriate hazardous voltage cable. A hazardous voltage is considered to be greater than 42.4 Vpeak or 60 VDC. The device is equipped with a SPST, non-latching, and normally open (NO) relay type; with a relay operate time of 8 ms. Another feature is a relay release and release bounce time of 4 ms.
Every relay channel of the NI cFP-RLY-421 has two terminals: one NO (normally open) and one IC (isolated common). All of the COM terminals are linked internally and all of the VSUP terminals are also linked internally. However, National Instruments does not suggest utilizing the COM and VSUP terminals with the cFP-RLY-421 Relay Output Module. An important fact to remember is that cascading power between two modules defeats isolation between those modules. Also, cascading power from the network module defeats all isolation between modules in the FieldPoint bank. The device has a recommended operating temperature of – 40 to 55 °C. It has a maximum AC switching power of 375 VA, and a maximum DC switching power of 60 W.
To link loads to the National Instruments cFP-RLY-421 Relay Output Module, the user must wire an external power supply to the load and the IC terminal of the separate channel. The user can install a 1.5 A, 250 V maximum, quick-acting fuse appropriate for the load at the IC terminal to protect the module and the load from harm. The device has a weight of 4.8 oz., with the dimensions: 4.3 x 4.3 x 3.6 in. It has an expected mechanical life of 2 × 107 operations minimum, an expected electrical life of 100,000 operations. As the cFP-RLY-421 is a UL recognized component, the system must be installed in a NEMA, IP, or UL listed enclosure to ensure safe use.
The cFP-RLY-421 is no longer available from National Instruments, but Apex Waves stocks end-of-life hardware in perpetuity. The Relay Output Module will remain available with us! Request a quote today.
| Model | cFP-RLY-421 |
|---|---|
| Manufacturer | National Instruments |
| Part Number | 777318-421 |
| Type | Relay Output Module for Compact FieldPoint |
| Channels | 8 |
| Relay Type | SPST, Nonlatching, Normally Open |
| Relay Operate Time | 8 ms |
| Dimensions | 4.3 by 4.3 by 3.6 in. |
| Weight | 4.8 oz. |
| Warranty | 2-3 Year Warranty |
| cFP-RLY-421 Manual | User Manual and Maintenance Manual Available for Download |
| Price | Request a Quote Today for Pricing Information |
Associated part numbers for cFP-RLY-421:
National Instruments cFP-RLY-421 Frequently Asked Questions
Question: What is the relay release time for the cFP-RLY-421 module?
Answer: The relay release time of the Relay Output Module is 4 ms.
Question: What is the maximum switching frequency of the NI cFP-RLY-421?
Answer: The maximum switching frequency is 20 operations per second.
Question: What do the LED indicators on the cFP-RLY-421 show?
Answer: The green Power LED indicator on the module shows when power is on and the self-test has been passed. The green Ready LED indicator shows when the module is configured and ready.
Question: What is the operating temperature range of the NI cFP-RLY-421?
Answer: The operating temperature range spans from -40 to 55 °C.
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