Littelfuse 02153.15TXP Ceramic Fuse 3.15A 250VAC 5x20mm - Equivalent & Substitute Parts

Part Overview

The Littelfuse 02153.15TXP is a ceramic cartridge fuse rated for 3.15A at 250VAC with slow-blow response characteristics. This component is designed for applications requiring overcurrent protection in AC/DC circuits with a 5mm x 20mm form factor. The part is active in production and widely stocked. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time characteristics, and regulatory compliance certifications.

Key Parameters

Parameter	Value
Current Rating	3.15 A
Voltage Rating (AC)	250 V
Voltage Rating (DC)	Not specified
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Ceramic
Breaking Capacity @ Rated Voltage	1.5kA
Melting I²t	43.255
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 02153.15TXP is determined by the following critical parameters:

Current Rating: 3.15A (exact match required)
Voltage Rating (AC): 250V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)

Substitute parts are grouped into three categories:

Parametric Equivalents (Littelfuse Series 215 & 285): Parts 02153.15HXP, 02153.15MXP, and 02853.15HXP share identical electrical and mechanical specifications with the main part. These differ only in internal construction or series designation but maintain full compatibility.

Direct Manufacturer Equivalents (SCHURTER & Bel Fuse): Parts 0001.2509, 5HT 3.15-R, and 0001.2709.11 meet all critical electrical parameters and mechanical dimensions. SCHURTER 0001.2509 and 0001.2709.11 provide enhanced DC voltage ratings (300V DC) while maintaining AC/DC slow-blow characteristics.

Manufacturer Recommended Alternatives (Eaton S505 Series): Parts BK/S505-3.15-R, BK1/S505-3.15-R, and S505-3.15-R are functionally equivalent with identical current, voltage, and response characteristics. These are cross-referenced in manufacturer substitution lists.

Limited Compatibility Option (SCHURTER FSM Series): Part 0034.2521 shares current rating and AC voltage but features medium-blow response and reduced DC voltage rating (125V DC). This part is suitable only for applications where medium-blow response is acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity (kA)	Melting I²t	Operating Temp (°C)	Inventory (Pcs)
02153.15TXP	Littelfuse Inc.	3.15	250	Not specified	Slow Blow	1.5	43.255	-55 to 125	732
02153.15HXP	Littelfuse Inc.	3.15	250	Not specified	Slow Blow	1.5	43.255	-55 to 125	1817
02153.15MXP	Littelfuse Inc.	3.15	250	Not specified	Slow Blow	1.5	43.255	-55 to 125	3808
02853.15HXP	Littelfuse Inc.	3.15	250	Not specified	Slow Blow	1.5	51.597	-55 to 125	1160
0001.2509	SCHURTER Inc.	3.15	250	300	Slow Blow	1.5	33.7	-55 to 125	38761
0034.2521	SCHURTER Inc.	3.15	250	125	Medium Blow	1.0	20.4	-40 to 85	1808
5HT 3.15-R	Bel Fuse Inc.	3.15	250	Not specified	Slow Blow	1.5	31	-55 to 125	135426
BK/S505-3.15-R	Eaton - Electronics Division	3.15	250	Not specified	Slow Blow	1.5	36.6	Not specified	2459
BK1/S505-3.15-R	Eaton - Electronics Division	3.15	250	Not specified	Slow Blow	1.5	36.6	Not specified	1777
S505-3.15-R	Eaton - Electronics Division	3.15	250	Not specified	Slow Blow	1.5	36.6	Not specified	946
0001.2709.11	SCHURTER Inc.	3.15	250	300	Slow Blow	1.5	33.7	-55 to 125	1388

Engineering Selection Recommendations

First Priority - Littelfuse Series 215 Parametric Equivalents (02153.15HXP, 02153.15MXP): These parts are direct internal variants of the 02153.15TXP with identical electrical specifications and full regulatory compliance. Selection among these three is based on inventory availability and internal construction preference. All carry ROHS3 compliance and comprehensive international certifications (CCC, CE, CSA, KC, PSE, SEMKO, UL, VDE).

Second Priority - SCHURTER SPT Series (0001.2509, 0001.2709.11): Both parts provide identical AC/DC slow-blow performance with enhanced 300V DC rating. These are suitable for applications requiring higher DC voltage margins. Both maintain 1.5kA breaking capacity and full temperature range operation (-55°C to 125°C). Regulatory certifications include CCC, cURus, VDE, and PSE/JET.

Third Priority - Bel Fuse 5HT Series (5HT 3.15-R): This part meets all electrical and mechanical requirements with comprehensive international certifications (CCC, CE, CSA, cURus, IMQ, PSE, SEMKO, VDE). Highest inventory availability (135,426 pcs) supports supply chain continuity.

Fourth Priority - Eaton S505 Series (BK/S505-3.15-R, BK1/S505-3.15-R, S505-3.15-R): All three variants provide identical slow-blow 3.15A 250VAC performance with 1.5kA breaking capacity. These are manufacturer-recommended cross-references with broad regulatory approval (BSI, CCC/CQC, CSA, cULus, IMQ, KC, PSE/JET, SEMKO, VDE).

Limited Use - SCHURTER FSM Series (0034.2521): This part is suitable only for applications where medium-blow response is acceptable. The reduced DC voltage rating (125V DC) and lower operating temperature ceiling (-40°C to 85°C) restrict its use to specific thermal and voltage environments.

Frequently Asked Questions (FAQ)

Q: Can I use 02153.15HXP or 02153.15MXP as direct replacements for 02153.15TXP?

A: Yes. Both parts are parametric equivalents with identical current rating (3.15A), voltage rating (250VAC), response time (slow blow), and mechanical dimensions (5mm x 20mm). All three carry ROHS3 compliance and equivalent regulatory certifications.

Q: What is the difference between the Littelfuse 215 series and 285 series fuses?

A: The 02853.15HXP (Series 285) differs from the main part in melting I²t value (51.597 vs. 43.255) and has limited regulatory approval (PSE only vs. comprehensive multi-agency certification). Use only when application-specific thermal characteristics require the higher I²t value.

Q: Can SCHURTER 0001.2509 replace the Littelfuse 02153.15TXP?

A: Yes, with the advantage of enhanced 300V DC rating. Both parts share identical 3.15A 250VAC slow-blow characteristics, 1.5kA breaking capacity, and 5mm x 20mm form factor. The SCHURTER part is suitable for applications requiring higher DC voltage protection margins.

Q: Why would I choose Bel Fuse 5HT 3.15-R over other substitutes?

A: The 5HT 3.15-R provides identical electrical performance with the highest inventory availability (135,426 pcs), ensuring supply chain reliability. It carries comprehensive international certifications and operates across the full -55°C to 125°C temperature range.

Q: Is SCHURTER 0034.2521 a suitable replacement?

A: The 0034.2521 is not a direct replacement. While it maintains the 3.15A 250VAC rating and 5mm x 20mm form factor, it features medium-blow response (not slow-blow) and reduced DC voltage rating (125V vs. unspecified). Use only when application requirements specifically allow medium-blow response and lower DC voltage operation.

Q: What are the key parameters I must verify before substitution?

A: Verify current rating (3.15A), AC voltage (250V), response time (slow blow), and mechanical package (5mm x 20mm). For DC applications, confirm the substitute part's DC voltage rating meets or exceeds circuit requirements. Confirm regulatory certifications match application compliance needs.

Q: Can I mix different manufacturers' fuses in the same circuit?

A: Yes, provided all substitutes meet identical electrical specifications (3.15A, 250VAC, slow-blow, 1.5kA breaking capacity) and mechanical dimensions (5mm x 20mm). Verify that the substitute carries required regulatory certifications for your application.

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