KTQ-3 Equivalent & Substitute Parts Reference

Part Overview

The KTQ-3 is a 3A 600VAC ceramic cartridge fuse manufactured by Eaton - Bussmann Electrical Division. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The KTQ-3 serves as a fast-blow protection device in electrical and industrial applications where cartridge-style fuses with holder mounting are specified. Substitute parts must maintain electrical compatibility across current rating, voltage rating, breaking capacity, and physical dimensions while meeting applicable approval standards.

Substiute Parts

KTQ-3

Eaton - Bussmann Electrical DivisionIn Stock: 1074KTQ-3 Datasheet

Current PartRFQ

BBS-3

Eaton - Bussmann Electrical DivisionIn Stock: 1005BBS-3 Datasheet

DirectRFQ

0KLQ003.T

Littelfuse Inc.In Stock: 10380KLQ003.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KTQ-3 are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Current Rating: 3 A (exact match required)
• Voltage Rating - AC: 600 V (exact match required)
• Breaking Capacity @ Rated Voltage: 10 kA (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Physical Dimensions: Cartridge form factor within tolerance

Two substitute parts meet these criteria:

BBS-3 (Eaton - Bussmann Electrical Division): Direct manufacturer alternative with identical electrical ratings and breaking capacity. Dimensions 0.410" Dia x 1.380" L fall within acceptable cartridge tolerance. Active product status enables current procurement.

0KLQ003.T (Littelfuse Inc., POWR-GARD® KLQ series): Equivalent electrical performance with 3A 600VAC rating and 10kA breaking capacity. Dimensions 0.406" Dia x 1.375" L match original specification within standard cartridge tolerances. Active product status with extended operating temperature range (-55°C ~ 125°C).

Parameter Comparison

Engineering Selection Recommendations

BBS-3 is the primary substitute for direct replacement applications. As an active product from the original manufacturer (Eaton - Bussmann), it maintains identical electrical specifications and fast-blow response characteristics. Dimensional tolerance (0.410" Dia x 1.380" L) is within standard cartridge fuse specifications. Approvals include CE, CSA, and UL, exceeding the original KTQ-3 UL-only certification.

0KLQ003.T serves as an alternative substitute with equivalent electrical performance. The POWR-GARD® KLQ series maintains 3A 600VAC rating and 10kA breaking capacity. Dimensions match the original specification precisely (0.406" Dia x 1.375" L). The primary distinction is slow-blow response time versus the original fast-blow characteristic. This difference requires circuit-level evaluation to confirm compatibility with the intended application. Extended operating temperature range (-55°C ~ 125°C) and RoHS3 compliance provide additional environmental advantages. UL and CE approvals support regulatory requirements.

Selection between BBS-3 and 0KLQ003.T depends on response time requirements. Applications requiring fast-blow protection should specify BBS-3. Applications tolerant of slow-blow response or requiring extended temperature operation may utilize 0KLQ003.T.

Frequently Asked Questions (FAQ)

Q: Can BBS-3 and 0KLQ003.T be used interchangeably with KTQ-3?

A: Both parts meet the core electrical requirements (3A, 600VAC, 10kA breaking capacity) and physical cartridge form factor. BBS-3 maintains identical fast-blow response. 0KLQ003.T differs in response time (slow-blow). Circuit compatibility must be confirmed based on application requirements before substitution.

Q: What is the significance of response time (fast-blow vs. slow-blow)?

A: Response time determines how quickly the fuse element melts under overcurrent conditions. Fast-blow fuses protect against sudden, high-magnitude faults. Slow-blow fuses tolerate temporary inrush currents while protecting against sustained overcurrent. Application circuit design specifies the required response characteristic.

Q: Are the dimensional differences between KTQ-3, BBS-3, and 0KLQ003.T significant?

A: All three parts are cartridge-style fuses requiring holder mounting. Dimensional variations (0.406"-0.410" diameter, 1.375"-1.380" length) fall within standard cartridge fuse tolerances and are compatible with standard cartridge holders. Physical fit in existing holders is not compromised.

Q: What approvals apply to each substitute?

A: KTQ-3 carries UL approval. BBS-3 adds CE and CSA approvals to UL. 0KLQ003.T carries CE and UL approvals. Selection should confirm that required regulatory certifications for the end application are present on the chosen substitute.

Q: Is RoHS compliance a factor in substitute selection?

A: BBS-3 is RoHS non-compliant. 0KLQ003.T is RoHS3 compliant. Applications subject to RoHS regulations should specify 0KLQ003.T. Applications without RoHS requirements may use either substitute based on response time and approval criteria.