LITTLEFUSE THC421C Single Shot Solid Timer 0.1-3SEC 120V-AC

( Brand: Littlefuse ), ( Manufacturer Part Number: THC421C ), ( Part Type: Timer ), ( Coil Voltage: Ac ), ( Reference Sku: 1747553 )

Review LITTLEFUSE Single Shot Solid State Timer 0.1-3sec 120v-ac

The Littlefuse THC421C is a versatile and reliable Single Shot Solid State Timer designed for applications requiring a 0.1 to 3 second delay in 120V-AC circuits. This timer is an excellent choice for various industrial, automation, and control systems where precise timing is essential.

The THC421C is a compact, surface-mount device, measuring 1.6 inches long, 0.8 inches wide, and 0.3 inches high. Its small size makes it ideal for space-constrained installations. The device features a solid-state design, ensuring reliable operation with minimal maintenance.

This timer operates by triggering a high voltage across a gas discharge tube when the input voltage is applied. Once triggered, the output remains active for a predetermined duration, which is set by the value of the connected capacitor. The output can be used to control various loads, such as relays, solenoids, or motors.

The THC421C is rated for a maximum voltage of 120V-AC and a maximum current of 5A. It can be used in temperatures ranging from -40 C to 85 C, making it suitable for a wide range of industrial applications. The device also features overvoltage protection, ensuring safe operation even in demanding environments.

The THC421C comes with a trigger input that can be activated by a variety of signals, including AC voltage, DC voltage, or a TTL pulse. The output is open-collector, allowing for easy connection to various loads. The device also features a test point, allowing for easy verification of its operation.

In summary, the Littlefuse THC421C Single Shot Solid State Timer is a compact, reliable, and versatile device designed to provide precise timing control in 120V-AC circuits. Its solid-state design ensures safe and reliable operation, and its wide operating temperature range makes it suitable for various industrial applications. With its easy-to-use trigger input and open-collector output, the THC421C is an essential component for any control system or automation project.

Pros and Cons of buying a Littlefuse THC421C Single Shot Solid Timer (0.1-3 sec, 120V-AC)

The Littlefuse THC421C is a single shot solid-state timer designed for applications requiring a time delay from 0.1 to 3 seconds. This timer operates on 120V-AC and can be a valuable addition to various electrical projects. In this analysis, we will discuss the key advantages and disadvantages of purchasing this timer.

1. Precise Time Delay: The THC421C offers a precise time delay, which is crucial for several applications that require accurate timing, such as relays, motors, or lighting systems.

2. Compact Size: With dimensions of 1.1 x 1.1 x 0.5 inches, the THC421C is a compact device that can easily be integrated into projects with limited space.

3. Solid-State Design: The timer's solid-state design ensures long-lasting performance and reliability, as there are no moving parts that can wear out or fail over time.

4. Wide Operating Temperature Range: The timer can operate in temperatures ranging from -40 C to 85 C, making it suitable for various environments.

5. Easy to Use: The Littlefuse THC421C is a simple-to-use device that does not require any external components, making it an excellent choice for hobbyists and professionals alike.

1. Limited Time Delay Range: Although the 0.1 to 3 seconds time delay range is suitable for many applications, it may not be sufficient for projects requiring longer time delays.

2. Single-Shot Operation: The timer is designed for single-shot operation, meaning it cannot be reset once triggered. For applications requiring multiple time delays, a different timer or a series connection of multiple THC421C units may be necessary.

3. Higher Cost Compared to Mechanical Timers: Due to its solid-state design and precise timing capabilities, the Littlefuse THC421C may be more expensive than mechanical timers with similar time delay ranges.

The Littlefuse THC421C Single Shot Solid Timer (0.1-3 sec, 120V-AC) is a reliable and precise timing solution ideal for various electrical projects with limited space and time delay requirements. Its compact size, solid-state design, and wide operating temperature range make it an attractive choice for hobbyists and professionals. However, its limited time delay range and single-shot operation may not be suitable for all applications, and its higher cost compared to mechanical timers is something to consider.

If your project requires a precise time delay within the 0.1 to 3 seconds range and you have limited space, the Littlefuse THC421C is an excellent choice. However, if you need longer time delays or multiple time delays events, consider looking into other timer options, such as multi-shot timers or variable resistor timers. Additionally, if cost is a significant concern, you may want to explore mechanical timers as an alternative.

Details:

Model Number:THC421C.

part #: thc421c price

• $179.55

specifications timerrelatime:

• brand: Littlefuse
• mpn: Thc421c
• part type: Timer
• coil voltage: Ac
• reference sku: 1747553

returns timerrelatime:

• time: 30 Days
• method: Money back
• paid by: Seller
• policy: Returns Accepted

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• wallet: Google-pay
• other
• credit card: Discover

offer timerrelatime:

• sold: 0
• best offers: True
• started: March 5, 2026
• quantity: 2
• options: Ship-to-home
• availability: In Stock

seller timerrelatime:

• city: Delta, Ohio
• # reviews: 124757
• rating: 100.0%

shipping timerrelatime:

• cost: $0.00
• transit: 5-5 Days
• type: Fixed
• class: Standard, Expedited, One-day
• service: Standard, Expedited, Overnight

general timerrelatime:

• condition: New
• PLCs HMIs > PLC Peripheral Modules > Timer Modules

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