Eaton BK/ACK-250 Fuse - Time-delay Stud-Mount 48 Vdc 250 A
Part Number: BK/ACK-250
Quick Summary
The Eaton BK/ACK-250 fuse is a time-delay, stud-mounted DC protection device designed for lift trucks and battery chargers. Engineers often encounter nuisance trips during high-current charging cycles, which this fuse helps mitigate by tolerating inrush while preserving protection. While the data notes Not Applicable for formal certifications, the Bussmann series design emphasizes robust DC protection with copper terminals, dual elements, and silver-plated fuse caps for reliable long-term service. In practice, this combination supports efficient fleet operations and reduced maintenance downtime, making it suitable for industrial electrical protection in material handling and warehouse applications. This model aligns with core business needs for uptime, safety compliance, and cost-effective inventory management in demanding DC power environments.
Product Information
Extended Description
BK/ACK-250 Eaton: Eaton Bussmann series ACK fuse, Time-delay stud-mounted fuse, Lift truck and battery charger fuse, 250 A, Dual, Non-indicating, 100 sec at 200%, 35 sec at 300%, 13 sec at 500%, Copper terminal, Bulk, 100, 48 Vdc
Product Name
Eaton Bussmann series ACK fuse
Catalog Number
BK/ACK-250
UPC
051712616638
Product Length/Depth
3.63 in
Product Height
1.063 in
Product Width
1.063 in
Product Weight
0.306 lb
Warranty
Not Applicable
Compliances
Not Applicable
Certifications
Not Applicable
Catalog Notes
Bulk
Amperage Rating
250 A
Response time
100 sec at 200%, 35 sec at 300%, 13 sec at 500%
Voltage rating
48 Vdc
Material
Copper terminal
Number of elements
Dual
Packaging type
Standard Bulk
Fuse indicator
Non-indicating
Mounting method
Stud
Quantity
100
Special features
Silver-plated fuse caps
Bussmann series complete full line catalog no. 1007
Bussmann series complete full line catalog no. 1007
Bussmann series Fuseology
Eaton Specification Sheet - BK/ACK-250
Feature: Time-delay dual-element protection at 250 A with a 48 Vdc rating → Business impact: Smooths inrush and transient faults, reducing nuisance trips and unplanned downtime in lift-truck charging systems. Application: Ideal for high-current DC circuits in industrial fleets. Feature: Stud mounting with copper terminal → Business impact: Quick, secure installation and reliable electrical contact, minimizing overheating risks. Application: Fleet maintenance and retrofit projects. Feature: Dual elements and non-indicating design → Business impact: Continuous protection without visual indicators that might mislead during routine checks, enabling safer battery charger integration. Application: Dense warehouse charging stations. Feature: Silver-plated fuse caps → Business impact: Improved contact reliability and corrosion resistance in harsh industrial environments. Application: Long service life in battery and charger protection. Feature: Bulk packaging (100 units) → Business impact: Lower procurement costs and streamlined stocking for service centers. Application: Large-scale installation and distribution. Industry context: This fuse supports DC protection in lift trucks, battery chargers, and other 48 Vdc DC power systems, delivering predictable performance and clear ROI through reduced downtime and safer operation.
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FAQs
BK/ACK-250 is a stud-mounted fuse with a copper terminal, designed for 48 Vdc DC circuits and high-current applications. It ships in bulk (100 units) and is straightforward to install on standard busbars and stud connections. For best results, ensure clean, tight connections and proper torque on the mounting studs to prevent overheating and arcing in demanding lift-truck charging stations.
The fuse offers time-delay protection with measured response times of 100 seconds at 200% fault current, 35 seconds at 300%, and 13 seconds at 500%. This behavior supports coordination with upstream protections to tolerate inrush during charging while still preventing extended fault currents. When planning protection schemes, pair BK/ACK-250 with upstream breakers or fuses sized for the system’s peak currents to minimize nuisance trips.
Yes. The BK/ACK-250 is specifically built as a lift truck and battery charger fuse, rated for 250 A at 48 Vdc with dual elements and copper terminals. Its time-delay characteristics help handle charging inrush, while its robust construction ensures reliable protection in fleet environments and reduces downtime due to protection-related outages.
The specification data provided indicates Not Applicable for certifications and compliance. While formal certifications are not listed in this dataset, the device is designed for high-current DC protection in industrial settings. Always verify your project’s regulatory requirements and consult the vendor for any updated certifications relevant to your region or application.
With a bulk 100-unit packaging and a durable copper/ silver-plated terminal design, maintenance cycles are typically infrequent if installation is done correctly. The 48 Vdc, 250 A rating supports high-current DC protection with predictable trip behavior, which reduces unplanned downtime in lift-truck fleets and battery charging operations. The result is improved equipment uptime, lower maintenance costs, and a favorable return on investment for fleets requiring dependable DC protection.