Description
Product Overview
The Bussmann TL20PK4 is a 20 Amp time delay plug fuse designed for 125 Volt systems. Engineered by Cooper Bussmann, a trusted name in electrical safety, this fuse combines a copper core with a surface‑mount form factor, allowing easy installation on panels without the need for specialized tools. Its time‑delay characteristic means the fuse can tolerate brief inrush currents—common when motors start or large appliances turn on—while still providing reliable overload protection. The compact dimensions of 3.6 × 2.2 × 2.3 inches and a lightweight 2.4‑ounce construction make it suitable for tight panel spaces, and the copper material ensures excellent conductivity and heat dissipation. With a unit count of four fuses per package, electricians and DIY enthusiasts can stock up for multiple projects, from residential remodels to small commercial installations. The product carries the UL‑listed certification and meets industry standards for safety and performance, giving confidence that each fuse will operate as intended under demanding conditions. Additionally, the fuse’s surface‑mount design reduces the risk of accidental contact during installation, enhancing overall workplace safety.

Usage
This plug fuse is ideal for protecting circuits in a variety of environments. In residential settings, it safeguards lighting circuits, kitchen appliance lines, and HVAC units where occasional high‑current spikes occur. For commercial applications, the TL20PK4 can be used in small office panel boards, vending machine power supplies, and light industrial control panels. The fuse’s 20 Amp rating aligns with typical branch circuit requirements, making it a versatile choice for electricians who need a reliable, time‑delay solution. Installation is straightforward: simply insert the fuse into a compatible plug‑type holder, ensuring the correct orientation and secure contact. Because the fuse is surface‑mount, it can be placed on the front of a panel board, allowing easy access for future replacement. The product’s durability and copper construction also make it suitable for environments with temperature fluctuations, as the material resists corrosion and maintains performance over time.
Why Choose Us
Choosing the Bussmann TL20PK4 means selecting a fuse backed by decades of engineering expertise and a reputation for quality. Cooper Bussmann’s manufacturing processes adhere to strict quality control standards, ensuring each fuse meets exact specifications for current rating, voltage tolerance, and time‑delay performance. The copper core not only provides superior electrical conductivity but also contributes to a longer service life compared to aluminum alternatives. Our surface‑mount design reduces installation time, allowing professionals to complete projects faster and with fewer errors. In addition, the product is supported by comprehensive technical documentation and responsive customer service, offering guidance on proper selection, installation, and troubleshooting. Should any issues arise, our dedicated support team is ready to assist, reinforcing the confidence that comes with purchasing a trusted brand. By investing in this fuse, you benefit from reliable protection, ease of use, and the peace of mind that comes from a proven, high‑quality component.
Key Features
- Time‑delay technology handles brief inrush currents without nuisance trips
- Copper construction ensures excellent conductivity and heat dissipation
- Surface‑mount design simplifies installation and saves panel space
- UL‑listed for safety compliance in residential and commercial applications
- Supported by responsive customer service and detailed technical resources
FAQ
What does a time‑delay fuse do?
A time‑delay (or slow‑blow) fuse allows short, high‑current surges—such as motor start‑up currents—to pass without opening the circuit, while still protecting against sustained overloads.
Can I replace this fuse with a standard fast‑acting fuse?
While a fast‑acting fuse will provide protection, it may nuisance‑trip during normal inrush events. The TL20PK4 is specifically designed for applications where a brief delay is beneficial.
Is this fuse suitable for outdoor panels?
The copper core resists corrosion, and the fuse’s rating is appropriate for indoor‑rated panels. For outdoor use, ensure the panel enclosure provides adequate protection from moisture.
How many fuses are included in the package?
The package contains four individual 20 Amp time‑delay plug fuses, allowing you to protect multiple circuits or keep spares on hand.
What size holder is required for this plug fuse?
The TL20PK4 fits standard 20 Amp plug‑type fuse holders that accept surface‑mount fuses. Verify the holder’s specifications to ensure compatibility.





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