Bussmann NOS60 60 Amp Class K5 600V UL Listed Fuse

1. Introduction

This manual provides essential information for the safe and effective use of the Bussmann NOS60 60 Amp Class K5 600V UL Listed fuse. This fuse is designed for overcurrent protection in various electrical applications. Please read this manual thoroughly before installation or operation and retain it for future reference.

2. Safety Information

WARNING: Risk of electric shock or fire. Improper installation or use can result in serious injury or death.

• Always disconnect power before installing, removing, or inspecting fuses.
• Installation and maintenance should only be performed by qualified electrical personnel.
• Ensure the fuse rating (voltage and current) matches the circuit requirements and equipment specifications.
• Do not use fuses that are damaged or appear altered.
• Never bypass a fuse or replace it with a fuse of a higher rating than specified.
• Adhere to all local and national electrical codes.

3. Product Overview

The Bussmann NOS60 is a 60 Amp, 600 Volt, Class K5, fast-acting cylindrical midget fuse. It is UL Listed, ensuring compliance with safety standards for overcurrent protection. This fuse is constructed from copper material, designed for reliable performance in appropriate electrical circuits.

Figure 1: Bussmann NOS60 60 Amp Class K5 600V UL Listed Fuse. This image shows the cylindrical body of the fuse with its ratings printed on the label.

4. Setup and Installation

1. Power Disconnection: Before beginning any installation, ensure that all power to the circuit where the fuse will be installed is completely disconnected and locked out. Verify with a voltage tester.
2. Fuse Holder Compatibility: Ensure that the fuse holder or disconnect switch is designed to accommodate a Class K5, 60 Amp, 600 Volt cylindrical midget fuse with dimensions of 1.0625" diameter x 5.5" length.
3. Fuse Inspection: Visually inspect the new Bussmann NOS60 fuse for any signs of damage, such as cracks, discoloration, or bent end caps. Do not install a damaged fuse.
4. Installation: Carefully insert the fuse into the designated fuse clips or holder. Ensure it is seated firmly and makes good electrical contact. Do not force the fuse into place.
5. Verification: Double-check that the correct fuse rating (NOS60, 60A, 600V) has been installed for the specific circuit.
6. Power Restoration: Once the fuse is securely installed and all safety checks are complete, restore power to the circuit.

5. Operation

The Bussmann NOS60 fuse operates as a sacrificial device designed to protect electrical circuits and equipment from overcurrent conditions. When an overcurrent (a current exceeding the fuse's 60 Amp rating) occurs, the metallic element within the fuse melts, opening the circuit and interrupting the flow of electricity. This prevents damage to wiring, motors, and other components that could be caused by excessive current or short circuits.

As a fast-acting fuse, it is designed to open quickly under overcurrent conditions, providing rapid protection for sensitive equipment.

6. Maintenance

Fuses are generally maintenance-free components. However, periodic inspection is recommended as part of a comprehensive electrical system maintenance program.

• Visual Inspection: During routine power-off maintenance, visually inspect fuses for any signs of physical damage, overheating (discoloration of the fuse body or end caps), or loose connections in the fuse holder.
• Replacement: A blown fuse will typically show a visible indication (e.g., a broken element if visible, or a darkened window if applicable, though this fuse type may not have one). If a fuse has blown, it must be replaced with an identical Bussmann NOS60 fuse (same brand, model, voltage, and current rating). Never attempt to repair a blown fuse.
• Cleaning: Ensure fuse clips and holders are clean and free of corrosion to maintain good electrical contact.

7. Troubleshooting

If a circuit protected by the Bussmann NOS60 fuse loses power, the fuse may have blown. Follow these steps:

1. Disconnect Power: Immediately disconnect all power to the affected circuit.
2. Identify Blown Fuse: Carefully remove the fuse from its holder. A blown fuse may show signs of a melted element or discoloration. If unsure, use a multimeter to check for continuity across the fuse. A good fuse will show continuity (very low resistance), while a blown fuse will show an open circuit (infinite resistance).
3. Investigate Cause: A fuse blows for a reason, typically an overload or a short circuit. Before replacing the fuse, investigate and rectify the cause of the overcurrent. Simply replacing the fuse without addressing the underlying issue will likely result in the new fuse blowing as well.
4. Replace Fuse: Replace the blown fuse with a new Bussmann NOS60 fuse of the exact same rating (60 Amp, 600V, Class K5).
5. Restore Power: Once the cause is resolved and the new fuse is installed, restore power to the circuit.

If fuses continue to blow, consult a qualified electrician to diagnose the electrical system.

8. Specifications

9. Warranty Information

Specific warranty terms for the Bussmann NOS60 fuse are typically provided by the manufacturer or the point of purchase. Fuses are consumable components designed to fail under specific conditions to protect other equipment. For detailed warranty information, please refer to the documentation provided with your purchase or contact Bussmann directly through their official website or customer service channels.

10. Support

For technical assistance, product inquiries, or further support regarding the Bussmann NOS60 fuse, please contact Bussmann customer service or visit their official website. You may also reach out to the authorized distributor or retailer from whom you purchased the product.

When contacting support, please have the product model (NOS-60) and any relevant purchase information readily available.