Littelfuse 021506.3TXP Ceramic Fuse 6.3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 021506.3TXP is a ceramic cartridge fuse rated for 6.3 A at 250 V AC with slow-blow response characteristics. This fuse is designed for applications requiring overcurrent protection in AC circuits and operates across a temperature range of -55°C to 125°C. The part is active in production and carries multiple international approvals including UL, CE, VDE, CSA, and CCC certifications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time characteristics, and approval agency compliance.

Key Parameters

Parameter	Specification
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	1.5 kA
Operating Temperature Range	-55°C to 125°C
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Substitution Criteria (Must Match):

Current Rating: 6.3 A
Voltage Rating (AC): 250 V
Package / Case: 5mm x 20mm
Fuse Type: Cartridge, Ceramic
Mounting Type: Requires Holder

Secondary Substitution Criteria (Preferred Match):

Response Time: Slow Blow
Breaking Capacity @ Rated Voltage: 1.5 kA
Operating Temperature Range: -55°C to 125°C
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into three categories based on parameter alignment with the main part 021506.3TXP.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Package	Breaking Capacity (kA)	Melting I²t	Operating Temp (°C)	DC Cold Resistance (Ω)	Product Status
021506.3TXP	Littelfuse Inc.	6.3	250	—	Slow Blow	5x20mm	1.5	128.75	-55 to 125	0.0108	Active
021506.3HXP	Littelfuse Inc.	6.3	250	—	Slow Blow	5x20mm	1.5	128.75	-55 to 125	0.0108	Active
021506.3MXP	Littelfuse Inc.	6.3	250	—	Slow Blow	5x20mm	1.5	128.75	-55 to 125	0.0108	Active
028506.3HXP	Littelfuse Inc.	6.3	250	—	Slow Blow	5x20mm	1.5	130.977	-55 to 125	0.0107	Active
0001.2512	SCHURTER Inc.	6.3	250	150	Slow Blow	5x20mm	1.5	171	-55 to 125	—	Active
0034.2524	SCHURTER Inc.	6.3	250	125	Medium Blow	5x20mm	1.0	159	-40 to 85	—	Active
5HT 6.3-R	Bel Fuse Inc.	6.3	250	—	Slow Blow	5x20mm	1.5	181	-55 to 125	0.01	Active
BK/S505-6.3-R	Eaton - Electronics Division	6.3	250	—	Slow Blow	5x20mm	1.5	111	—	Active
BK1/S505-6.3-R	Eaton - Electronics Division	6.3	250	—	Slow Blow	5x20mm	1.5	111	—	Active
S505-6.3-R	Eaton - Electronics Division	6.3	250	—	Slow Blow	5x20mm	1.5	111	—	Active
0001.2512.G	SCHURTER Inc.	6.3	250	150	Slow Blow	5x20mm	1.5	171	-55 to 125	—	Active

Engineering Selection Recommendations

Littelfuse Series 215 (021506.3HXP, 021506.3MXP, 028506.3HXP): These parts are direct parametric equivalents from Littelfuse, matching the 6.3 A, 250 V AC rating, 5x20mm package, and slow-blow response. All three carry ROHS3 compliance and operate across -55°C to 125°C. The 021506.3HXP and 021506.3MXP are identical to the main part 021506.3TXP in all specified parameters. The 028506.3HXP (Series 285) differs only in melting I²t (130.977 vs 128.75) and carries PSE approval only, compared to the broader approval set of the main part.

SCHURTER SPT Series (0001.2512, 0001.2512.G): These parts match the primary substitution criteria with 6.3 A, 250 V AC, 5x20mm package, and slow-blow response. Both include 150 V DC rating capability and 1.5 kA breaking capacity. The .G variant is a packaging variant of 0001.2512. Operating temperature range matches the main part (-55°C to 125°C). Melting I²t is higher at 171 compared to 128.75.

SCHURTER FSM Series (0034.2524): This part meets the primary substitution criteria for current, voltage, and package but differs in response time (Medium Blow vs Slow Blow), breaking capacity (1.0 kA vs 1.5 kA), operating temperature range (-40°C to 85°C vs -55°C to 125°C), and carries no listed approval agencies. Use only when medium-blow response is acceptable for the application.

Bel Fuse 5HT Series (5HT 6.3-R): This part matches all primary substitution criteria and secondary criteria including 6.3 A, 250 V AC, 5x20mm package, slow-blow response, and 1.5 kA breaking capacity. Operating temperature range is -55°C to 125°C. Melting I²t is 181, higher than the main part. Carries CCC, CE, CSA, cURus, SEMKO, and VDE approvals.

Eaton S505 Series (BK/S505-6.3-R, BK1/S505-6.3-R, S505-6.3-R): All three variants match the primary substitution criteria with 6.3 A, 250 V AC, 5x20mm package, slow-blow response, and 1.5 kA breaking capacity. Melting I²t is 111, lower than the main part. Operating temperature range is not specified. All carry comprehensive approval agency certifications including BSI, CCC/CQC, CSA, cULus, IMQ, KC, PSE/JET, SEMKO, and VDE.

Frequently Asked Questions (FAQ)

Q: Can 021506.3HXP and 021506.3MXP be used interchangeably with 021506.3TXP?

A: Yes. Both parts are parametric equivalents from Littelfuse Series 215 with identical electrical ratings (6.3 A, 250 V AC), response time (slow blow), package dimensions (5x20mm), breaking capacity (1.5 kA), melting I²t (128.75), operating temperature range (-55°C to 125°C), and approval certifications. All three are active production parts with ROHS3 compliance.

Q: What is the difference between the Littelfuse 028506.3HXP and 021506.3TXP?

A: The 028506.3HXP is from Series 285 and differs in melting I²t (130.977 vs 128.75) and approval agency coverage (PSE only vs CCC, CE, CSA, KC, PSE, SEMKO, UL, VDE). All other parameters including current, voltage, package, response time, and operating temperature are identical.

Q: Can SCHURTER 0001.2512 replace the Littelfuse 021506.3TXP?

A: The SCHURTER 0001.2512 meets the primary substitution criteria (6.3 A, 250 V AC, 5x20mm, slow blow, 1.5 kA breaking capacity) and extends functionality with 150 V DC rating. The melting I²t is higher at 171. Operating temperature range matches (-55°C to 125°C). Substitution is valid when DC voltage capability is acceptable or beneficial.

Q: Why does the SCHURTER 0034.2524 have different specifications?

A: The 0034.2524 is from the FSM series with medium-blow response instead of slow-blow, lower breaking capacity (1.0 kA vs 1.5 kA), and narrower operating temperature range (-40°C to 85°C). These differences indicate it is designed for different application requirements. Use only when medium-blow response is specified for the circuit.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status. The main part 021506.3TXP and most substitutes are explicitly marked ROHS3 Compliant. Verify compliance documentation for specific procurement requirements.

Q: What approval agencies are common across all substitute parts?

A: CCC, CSA, KC, PSE, and VDE approvals are present across multiple substitute parts. The main part 021506.3TXP carries the broadest approval set including CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE. Verify specific approval requirements for your application before selection.

Q: Can Eaton S505 series fuses be used in place of Littelfuse 021506.3TXP?

A: Yes, the Eaton S505 variants (BK/S505-6.3-R, BK1/S505-6.3-R, S505-6.3-R) meet all primary substitution criteria with 6.3 A, 250 V AC, 5x20mm package, slow-blow response, and 1.5 kA breaking capacity. The melting I²t is lower at 111. Operating temperature range is not specified in the provided data. Substitution is valid when these parameter differences are acceptable.

Q: What is the difference between 0001.2512 and 0001.2512.G?

A: The 0001.2512.G is a packaging variant of the base product 0001.2512. Both parts are electrically and mechanically identical with 6.3 A, 250 V AC, 150 V DC, 5x20mm package, slow-blow response, and 1.5 kA breaking capacity. The .G designation indicates a different packaging configuration.

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