Bussmann LPS-RK Low-Peak Class...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$148.07
Bussmann LPS-RK Low-Peak Class RK1 Dual-Element Time-Delay Fuse

Bussmann LPS-RK Low-Peak Class RK1 Dual-Element Time-Delay Fuse

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Model: LPS-RK-45SP

In Stock (leaves warehouse same day if ordered before 3pm ET)

$148.07
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Bussmann Time Delay Fuse LPS-RK Series 175A 600VAC/300VDC Class RK1 Dual Element Blade End Current Limiting

Professional-Grade Low-Peak Current Limiting Electrical Protection

The Bussmann LPS-RK Series 175A Time Delay Fuse delivers superior electrical protection and circuit safety for motor circuits, transformer protection, and industrial power distribution systems. This Class RK1 current limiting fuse features dual element time delay technology with blade end connections designed for electrical contractors, industrial facilities, and commercial installations, providing the reliable overcurrent protection and industry-leading safety that electrical professionals demand.

Professional Features & Benefits

Current Limiting Protection

  • 175A Current Rating - Handles high amperage loads with precise overcurrent protection for motor and transformer circuits
  • Class RK1 Current Limiting - Reduces available fault current to protect downstream equipment and minimize arc flash hazards
  • Dual Element Design - Provides time delay for motor starting currents while offering fast response to short circuit faults
  • 600VAC/300VDC Voltage Rating - Versatile voltage capability for AC and DC electrical systems in industrial applications

Safety & Standards Compliance

  • 100 kAIC Interrupt Rating at 300VDC - High fault current interrupting capability ensures safe fault clearing in demanding applications
  • CE Marked Compliance - Meets international electrical safety standards for global installations
  • Non-Indicating Design - Professional grade construction with reliable operation indication through external monitoring systems

Technical Specifications

175 ampere current rating, 600VAC/300VDC voltage rating, 100 kAIC interrupt rating at 300VDC, Class RK1 current limiting classification, dual element time delay operation, blade end x blade end connection, dimensions 1.61" H x 1.61" W x 9.63" L, weight 1.5 lb, electrically isolated end cap construction, non-indicating operation.

Installation & Setup

  1. Verify electrical system is de-energized and follow lockout/tagout procedures for safe fuse installation
  2. Confirm fuse holder compatibility with blade end connection and Class RK1 rejection features
  3. Insert fuse into holder ensuring proper blade contact alignment and secure mechanical connection
  4. Verify fuse amperage rating matches circuit protection requirements and motor full load current calculations
  5. Test installation with appropriate electrical testing equipment before energizing circuit
  6. Document fuse installation per NEC requirements and facility electrical maintenance procedures

Professional Applications

Ideal for:

  • Motor Protection Circuits - Large motor starters, variable frequency drives, and motor control centers requiring time delay protection
  • Transformer Primary Protection - Distribution transformers, control transformers, and power supply protection systems
  • Industrial Control Panels - Manufacturing equipment, process control systems, and automated machinery protection
  • Power Distribution Systems - Electrical panels, switchgear, and distribution boards in commercial and industrial facilities
  • Lighting Circuit Protection - High intensity discharge lighting, LED driver circuits, and commercial lighting systems
  • HVAC Equipment Protection - Air handling units, chillers, and building automation system electrical protection
  • Welding Equipment Circuits - Industrial welding systems and high current DC applications requiring dual voltage capability
  • Battery System Protection - DC power systems, UPS equipment, and renewable energy storage applications

Low-Peak Current Limiting Advantage

Bussmann LPS-RK series fuses utilize advanced current limiting technology that reduces peak let-through current and energy, minimizing damage to electrical equipment during fault conditions. The dual element design provides excellent time delay characteristics for motor starting while maintaining fast fault clearing capability, ensuring optimal selective coordination in electrical distribution systems.

Why Choose Bussmann Quality?

Bussmann demonstrates unwavering commitment to electrical safety through rigorous testing, international compliance standards, and reliable overcurrent protection technology. Each LPS-RK series fuse undergoes comprehensive quality control testing to ensure consistent performance in professional electrical installations, providing the circuit protection reliability and electrical system safety that contractors and facility managers require for critical applications.

Manufacturer Resources

Product Specs

Number Of Elements:
Dual
Class:
Class RK1
Fuse Type:
Time delay
Fuse Indicator:
Non-indicating
Voltage Rating:
600 Vac, 300 Vdc
Packaging Type:
Standard
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Time-Delay Fuse
Product Subgroup:
Fuses

Bussmann LPS-RK-45SP – Frequently Asked Questions

1) What amp ratings does the Bussmann LPS-RK Low-Peak fuse come in?
Seven ratings: 45A, 90A, 100A, 175A, 225A, 300A and 450A, ordered as LPS-RK-45SP through LPS-RK-450SP. The SP suffix is the single-pack designation on the Low-Peak part number. Size the amp rating to the motor full load current and the protection required by your calculation, not to the holder size.
2) Will a Class RK1 fuse fit my existing Class R fuse block?
Yes, if the block is a Class R block. RK1 and RK5 share the same case dimensions and the same rejection feature, so an LPS-RK drops into any Class R rejection holder. The reverse is not true: a Class R fuse will not fit a non-rejection Class H or K block. On the larger ratings here the ends are blade type rather than ferrule, so the holder must be a bolt-in or blade-clip style.
3) Should I use an RK1 fuse or an RK5 for motor protection?
Both are dual-element time-delay and both will ride through motor inrush. The difference is let-through energy: RK1 is the more current-limiting of the two, so it drops peak let-through current and I2t further and gives you better downstream component protection and a lower arc flash incident energy. Choose RK1 where you are relying on the fuse for series ratings or equipment protection; RK5 is the economy choice when only overcurrent protection is required. The LPS-RK is the RK1.
4) Why does a motor circuit need a dual-element time-delay fuse instead of a fast-acting one?
A motor pulls six or more times its running current for a few seconds on start. The LPS-RK uses two elements: the thermal overload element tolerates that starting surge without opening, while the short-circuit element clears a bolted fault in a fraction of a cycle. A fast-acting fuse sized to the motor's full load current would nuisance-open on every start, and one sized up to survive the start would no longer give close overload protection.
5) Does the LPS-RK have a blown fuse indicator?
No. The LPS-RK is non-indicating, so there is no pop-out pin or window to tell you it has opened. On a panel where you want visual or remote fault indication you will need an external blown-fuse monitoring relay or indicating fuse holder, or you test with a meter during troubleshooting.
6) Can I use these Low-Peak fuses on transformer primary protection?
Yes, that is one of the main uses for a dual-element Low-Peak. Transformers draw a heavy magnetizing inrush when energized, and the time-delay element lets that pass without opening while still holding the primary within NEC overcurrent limits. The same characteristic is why the series is used on HID and LED lighting circuits, chillers and air handlers, where inrush is high but the running load is modest.
How fast can I get the Bussmann LPS-RK-45SP delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Bussmann LPS-RK-45SP come with a warranty?
Absolutely. The Bussmann LPS-RK-45SP is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Bussmann LPS-RK-45SP?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Bussmann LPS-RK-45SP from ZenSupply?
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