CFP-RLY-421 NATIONAL INSTRUMENTS Relay Module Spst

Review NATIONAL INSTRUMENTS Relay Output Module 8ch Spst 5-35vdc/5-250vac

The National CFP-RLY-421 is an eight-channel SPST (Single Pole, Single Throw) relay module designed for both DC (5-35V) and AC (5-250V) applications. This versatile relay module offers a compact size, making it an ideal choice for various automation projects.

Each channel is independently controlled by an NO (Normally Open) form C form contact. When the input voltage is applied to the corresponding channel, the relay closes, allowing the DC or AC load to be energized. Conversely, when the input voltage is removed, the relay opens, disconnecting the load.

The CFP-RLY-421 is built with high-quality components, ensuring reliable operation, even in demanding environments. Each channel can handle a maximum load current of 1 A and a maximum load voltage of 250V AC, making it suitable for applications requiring the switching of low to medium power loads.

The module's design includes an LED indicator for each channel, which illuminates when the corresponding relay is activated. This feature is helpful in verifying the status of each channel in real-time.

The CFP-RLY-421 is housed in a robust and durable aluminum case, providing excellent heat dissipation and protection against electromagnetic interference. The module also features screw terminals for easy wiring, ensuring a secure connection to the load and input power sources.

In summary, the National CFP-RLY-421 is an eight-channel relay module that offers versatile switching capabilities for DC and AC loads. Its compact size, reliable operation, and easy-to-use design make it an essential tool for various automation projects.

The National CFP-RLY-421 relay module is a 8-channel SPST (Single Pole Single Throw) relay with a voltage range of 5Vdc to 35Vdc for the coil and 5Vac to 250Vac for the contacts. Here are some pros and cons of buying this relay module:

1. Versatile voltage range: The relay module supports both low voltage coils (5Vdc to 35Vdc) and high voltage contacts (5Vac to 250Vac), making it suitable for a wide range of applications.

2. Large contact rating: Each contact can handle up to 10A and 250Vac, making it suitable for heavy-duty applications.

3. Compact size: The module is relatively small, measuring 5.3 x 4.1 x 1.1 inches, making it easy to integrate into small projects.

4. Easy to use: The module has screw terminals for easy wiring, and each channel has an LED indicator to show when the relay is activated.

1. Limited number of channels: The module only has 8 channels, which may not be sufficient for larger projects.

2. High power consumption: Each coil consumes approximately 0.3W when activated, which can add up quickly for larger projects with many relays.

3. No opto-isolated inputs: The module does not have opto-isolated inputs, which may be a concern for projects requiring isolation between the control and load circuits.

In conclusion, the National CFP-RLY-421 relay module is a versatile and easy-to-use option for projects requiring a large number of heavy-duty SPST relays. However, it may not be the best choice for larger projects with many relays or for projects requiring opto-isolation.

Recommendation: If you only need a few heavy-duty relays with a wide voltage range, the National CFP-RLY-421 relay module is an excellent choice. However, if you require more channels, lower power consumption, or opto-isolation, you may want to consider other options such as solid-state relays or opto-isolated relay modules.

Details:

If you do not have an account no worries. voltage rating: 5-35vdc, 5-250vac. For compact field point. Specifications: model #: CFP-RLY-421.

Configuration: 8-channel spst-no relay. Current rating: 1.5a. This is a surplus item.

specifications genpurrelays:

• brand: National Instruments
• mpn: Cfp-rly-421
• part type: Instrument Module
• current type: Ac/dc

general genpurrelays:

• category: Business & Industrial > Electrical Equipment Supplies > General Purpose Relays

offer genpurrelays:

• availability: in stock
• prices: $330.00–$2330.63
• item condition:
  • Used
  • Gebraucht
• best offers: true
• in stock #: 5
• started: march 31, 2026
• sold #: 12
• options: ship-to-home

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• policy: returns accepted
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