TPS-50 Equivalent & Substitute Parts Reference

Part Overview

The TPS-50 is a 50A 170VDC cartridge fuse manufactured by Eaton - Bussmann Electrical Division, part of the Telpower® TPS series. This component is designed for telecom applications requiring reliable DC circuit protection in holder-mounted configurations. The part maintains active product status with 1007 units in current inventory. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification, enabling direct replacement in existing designs without circuit modification.

Substiute Parts

TPS-50

Eaton - Bussmann Electrical DivisionIn Stock: 1066TPS-50 Datasheet

Current PartRFQ

0TLS050.T

Littelfuse Inc.In Stock: 11680TLS050.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TPS-50 is determined by strict alignment of the following electrical and mechanical parameters:

• Current Rating: Must be 50A
• Voltage Rating (DC): Must be 170 VDC
• Fuse Type: Must be Cartridge
• Mounting Type: Must require holder configuration
• Breaking Capacity @ Rated Voltage: Must be 100kA
• Package / Case: Must be Cartridge, Non-Standard
• Physical Dimensions: Diameter 0.563" (14.30mm); Length within 0.874" to 0.880" L (22.20mm to 22.35mm)
• Regulatory Compliance: Must hold CE certification; UR or cURus certification acceptable

The 0TLS050.T from Littelfuse Inc. meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the TPS-50 and 0TLS050.T maintain active product status with current manufacturing support and inventory availability. Selection between these parts should be based on:

Certification Requirements: The TPS-50 carries CE and UR certifications, while the 0TLS050.T carries CE and cURus certifications. Verify that your application's regulatory framework accepts cURus certification as equivalent to UR certification before selecting the Littelfuse substitute.

Dimensional Tolerance: The 0TLS050.T length specification (0.880" L) is 0.006" longer than the TPS-50 (0.874" L). Confirm that the holder assembly accommodates this minor dimensional variance without mechanical interference.

Response Characteristic: The 0TLS050.T is specified as Fast Blow, while the TPS-50 response time is not specified in available documentation. If your circuit design depends on a specific response characteristic, clarify the TPS-50 response profile before substitution.

RoHS Compliance: Both parts meet RoHS requirements. The 0TLS050.T carries ROHS3 designation, representing the current RoHS standard iteration.

Frequently Asked Questions (FAQ)

Q: Can the 0TLS050.T replace the TPS-50 in existing designs?

A: The 0TLS050.T is electrically and mechanically equivalent to the TPS-50 across all critical parameters: 50A current rating, 170VDC voltage rating, 100kA breaking capacity, and cartridge form factor. Both parts require holder mounting and share identical diameter specifications. Substitution is valid provided your application's regulatory framework accepts cURus certification and the holder assembly tolerates the 0.006" length difference.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by matching: current rating (50A), DC voltage rating (170VDC), fuse type (cartridge), breaking capacity (100kA), package form (cartridge, non-standard), physical diameter (0.563"), and regulatory certifications (CE required; UR or cURus acceptable). Length tolerance is 0.874" to 0.880" L.

Q: Are there inventory or lead time considerations?

A: The TPS-50 has 1007 units in stock; the 0TLS050.T has 1109 units in stock. Both parts maintain active product status with current manufacturing support.

Q: What is the difference between UR and cURus certifications?

A: Both certifications indicate compliance with UL standards. UR is the UL Recognized mark; cURus is the combined Canadian-US mark. Verify your application's regulatory requirements to confirm acceptance of either certification.

Q: Does the Fast Blow response characteristic of the 0TLS050.T affect compatibility?

A: The response time specification indicates how quickly the fuse opens under overcurrent conditions. If your circuit design requires a specific response profile, confirm the TPS-50 response characteristic before substitution. Both parts share identical 100kA breaking capacity at rated voltage.