HE3321A0400 LITTLE FUSE Reed Relay Spst Hole

Review LITTLE FUSE Reed Relay Spst-no 500ma 5v Through Hole

The Fuse Industries HE3321A0400 reed relay is a single-pole, single-throw (SPST) device designed for use in applications requiring the switching of low currents and voltages. This particular model is rated for a maximum contact capacity of 500mA and can be operated with a voltage range of 5V DC.

This compact relay measures approximately 18.5mm x 27.5mm x 12.5mm (L x W x H), making it a suitable choice for space-constrained applications. Its reed contact design ensures reliable operation with minimal wear, as the contacts are sealed within a glass tube filled with an inert gas. This design also guarantees a quiet switching action, making it an excellent option for applications where noise is a concern.

The terminals on the relay are provided with a 2.54mm pitch, ensuring compatibility with standard 0.1" headers and PCBs. The NO (Normally Open) configuration of the relay means that the contacts are open when the coil is not energized, and they close when the coil is activated.

The HE3321A0400 reed relay from Fuse Industries is a robust and versatile component, suitable for a wide range of applications in various industries, including automotive, telecommunications, medical equipment, and test and measurement systems. Its compact size, quiet operation, and reliable contact switching make it an essential tool for engineers and designers seeking a high-performance solution for their low-current switching needs.

The HE3321A0400 Reed Relay from Honeywell is a commonly used electromechanical switch that operates on a 5V DC supply and can handle up to 500mA of current. Here are some pros and cons of buying this relay:

1. Reed relays are known for their reliability and long life due to the absence of moving contacts.

2. They have a low power consumption, making them an energy-efficient option.

3. The HE3321A0400 has a compact size, which makes it suitable for space-constrained applications.

4. It can handle a relatively high current and voltage, making it suitable for various applications.

5. Reed relays have a fast switching time, which is useful in applications where quick switching is required.

1. Reed relays may produce some noise during operation due to the magnetic attraction and repulsion of the reed contacts.

2. They are not as fast as solid-state relays, which may limit their use in high-speed applications.

3. The coil resistance of the relay can affect the overall circuit design, which may require additional components and considerations.

4. Reed relays can be sensitive to magnetic fields, which may require shielding in certain applications.

The HE3321A0400 Reed Relay from Honeywell is a reliable and energy-efficient option for applications requiring a compact, low-power switch with a decent current and voltage handling capability. Its fast switching time makes it suitable for various applications, but the potential noise and sensitivity to magnetic fields are important considerations. Overall, the pros outweigh the cons, making it a good choice for many applications where a reed relay is appropriate.

If you require a reliable and compact switch for your application and can tolerate the potential noise and sensitivity to magnetic fields, the HE3321A0400 Reed Relay is a good option to consider. However, if you need a faster switch, a solid-state relay may be a better choice, or if your application requires high-speed switching and is sensitive to magnetic fields, consider an optocoupler or other isolation technology.

Details:

Series: he3300. Life expectancy: 100,000 operations. Rated current: 500 ma. Coil resistance: 500 ohms.

specifications genpurrelays:

• brand: Little Fuse
• mpn: He3321a0400

offer genpurrelays:

• sold #: 20
• prices: $11.99–$21.74
• item condition: New
• availability: in stock
• started: july 31, 2025
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• in stock #: 5

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