TPL-BE 125A 170VDC Cylindrical Fuse Cartridge Equivalent & Substitute Parts

Part Overview

The TPL-BE is an active Telpower® cylindrical fuse cartridge rated for 125A at 170VDC, designed for bolt mount applications in telecom systems. This component provides overcurrent protection in high-voltage DC circuits. Substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity while maintaining identical electrical and mechanical specifications.

Substiute Parts

TPL-BE

Eaton - Bussmann Electrical DivisionIn Stock: 1116TPL-BE Datasheet

Current PartRFQ

L17T125.T

LittelfuseIn Stock: 791L17T125.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TPL-BE is determined by strict equivalence across the following critical parameters:

• Current Rating: 125A (exact match required)
• Voltage Rating: 170VDC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Bolt Mount (exact match required)
• Package / Case: Cylindrical, Blade Terminal (Bolt) (exact match required)
• Size / Dimension: 1.000" Dia x 1.157–1.160" L (tolerance range acceptable)
• Breaking Capacity: 100kA (exact match required)

The substitute part L17T125.T from Littelfuse meets all mandatory electrical and mechanical parameters and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the TPL-BE and L17T125.T are active products with identical electrical ratings and mechanical specifications. Selection between these components may be based on:

• Approval agency requirements: The L17T125.T carries CSA certification in addition to CE and UR, providing broader regulatory coverage in North American applications.
• RoHS compliance level: The L17T125.T meets ROHS3 Compliant status, while the TPL-BE meets RoHS Compliant status.
• Response time specification: The L17T125.T is specified as Fast Blow, providing defined protection characteristics for time-sensitive applications.
• Packaging format: TPL-BE is supplied in Bulk packaging; L17T125.T is supplied in Box packaging.
• Inventory availability: Selection may depend on stock levels and lead times from respective distributors.

Frequently Asked Questions (FAQ)

Q: Can L17T125.T be used as a direct replacement for TPL-BE in existing installations?

A: Yes. Both components share identical current rating (125A), voltage rating (170VDC), fuse type (Cartridge), mounting type (Bolt Mount), package configuration (Cylindrical, Blade Terminal), and breaking capacity (100kA). Physical dimensions are within acceptable tolerance (1.157" vs. 1.160" length). No circuit redesign or mechanical modification is required.

Q: What are the key differences between these two parts?

A: The primary differences are manufacturer (Eaton vs. Littelfuse), series designation (Telpower® TPL vs. POWR-GARD® L17T), response time specification (unspecified vs. Fast Blow), approval agencies (CE/UR vs. CE/CSA/UR), and RoHS compliance level (RoHS Compliant vs. ROHS3 Compliant). Electrical and mechanical performance are equivalent.

Q: Are there any compatibility concerns with bolt mount terminals?

A: No. Both parts use identical Cylindrical, Blade Terminal (Bolt) configuration with matching 1.000" diameter. Bolt hole spacing and terminal geometry are compatible with standard fuse holders designed for this package type.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. For North American markets requiring CSA certification, L17T125.T is preferred. For applications requiring specific response time characteristics, L17T125.T (Fast Blow) provides defined protection. For general telecom applications, either part meets specifications.

Q: What is the significance of the 0.003" dimension difference in length?

A: The 0.003" difference (1.160" vs. 1.157") is within standard manufacturing tolerance for cylindrical fuse cartridges and does not affect mechanical fit, electrical performance, or safety characteristics in standard bolt mount fuse holders.