Eaton Bussmann BK/JJS-30 Equivalent & Substitute Parts

Part Overview

The Eaton Bussmann BK/JJS-30 is a 30A 600VAC fast-blow cartridge fuse from the Limitron™ JJS series. This component is classified as an active product with full regulatory compliance (CE, CSA, UL). Cartridge fuses of this specification are critical in electrical and industrial applications where circuit protection at 30 amperes and 600 volts AC is required. Substitute parts may be necessary due to inventory availability, supply chain considerations, or specific application requirements that align with equivalent electrical and mechanical parameters.

Substiute Parts

BK/JJS-30

Eaton - Bussmann Electrical DivisionIn Stock: 1273BK/JJS-30 Datasheet

Current PartRFQ

JLLS030.T

Littelfuse Inc.In Stock: 859JLLS030.T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/JJS-30 is determined by the following critical parameters:

• Current Rating: Must be 30A
• Voltage Rating (AC): Must be 600 VAC minimum
• Fuse Type: Must be Cartridge
• Response Time: Must be Fast Blow
• Class: Must be T
• Breaking Capacity: Must be 200kA at rated voltage
• Physical Dimensions: Must be compatible with standard cartridge fuse holders (0.560" diameter nominal tolerance)
• Regulatory Compliance: Must hold CE, CSA, and/or UL certifications

The Littelfuse JLLS030.T meets all substitution criteria. While it provides additional DC voltage capability (300 VDC) and slightly different dimensional tolerances (0.563" Dia), these parameters remain within acceptable substitution boundaries for AC-rated applications. Both parts share identical current, AC voltage, class, response time, and breaking capacity specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the Eaton BK/JJS-30 and Littelfuse JLLS030.T are active products with current regulatory compliance. Selection between these parts should be based on:

• Holder compatibility: Verify that the cartridge fuse holder accommodates the dimensional tolerances of either part (0.560" to 0.563" diameter range)
• Regulatory requirements: Both parts carry CE and CSA certifications. The Eaton part holds UL approval; the Littelfuse part holds UR approval. Confirm which certification is required for your application
• DC voltage capability: The Littelfuse JLLS030.T provides 300 VDC rating in addition to 600 VAC, offering broader application flexibility if DC circuits are present
• RoHS compliance level: The Littelfuse part meets ROHS3 Compliant status, while the Eaton part meets RoHS Compliant status
• Inventory and lead time: Eaton BK/JJS-30 has 1165 units in stock; Littelfuse JLLS030.T has 775 units in stock

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse JLLS030.T be used as a direct replacement for the Eaton BK/JJS-30?

A: Yes, for 600 VAC applications. Both parts share identical current rating (30A), voltage rating (600 VAC), fuse class (T), response time (fast blow), and breaking capacity (200kA). Dimensional differences (0.560" vs 0.563" diameter) are within standard cartridge fuse holder tolerances. Verify holder compatibility before installation.

Q: What is the significance of the additional 300 VDC rating on the Littelfuse part?

A: The Littelfuse JLLS030.T is rated for both 600 VAC and 300 VDC operation. This dual-voltage capability makes it suitable for applications that include DC circuits. The Eaton BK/JJS-30 is specified for AC operation only. If your circuit is AC-only, this additional rating does not affect performance.

Q: Are there any certification differences between these parts?

A: Both parts hold CE and CSA certifications. The Eaton part is UL-approved; the Littelfuse part is UR-approved. Confirm which certification standard is required by your application or regional regulations before selection.

Q: What holder type is required for these cartridge fuses?

A: Both the Eaton BK/JJS-30 and Littelfuse JLLS030.T require a separate cartridge fuse holder. The holder must accommodate cartridge fuses with a nominal 0.560" to 0.563" diameter and 1.500" length. Verify your existing holder specifications before substitution.

Q: Are both parts RoHS compliant?

A: Yes. The Eaton BK/JJS-30 is RoHS Compliant. The Littelfuse JLLS030.T is ROHS3 Compliant, which represents a more recent compliance standard. Both parts meet RoHS requirements.