Littelfuse 0217.800TXP Glass Cartridge Fuse 800mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0217.800TXP is an 800mA, 250VAC fast-blow glass cartridge fuse in 5x20mm form factor, designed for AC/DC circuit protection applications requiring holder mounting. This component is active in production and widely stocked. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part number becomes unavailable or when alternative certifications are required for specific regional or application requirements.

Key Parameters

Parameter	Value
Current Rating	800 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0217.800TXP are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalents (Littelfuse Series 217 & 235): Parts 0217.800HXP, 0217.800MXP, 0235.800HXP, and 0235.800MXP share identical current rating (800mA), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), package dimensions (5x20mm), mounting requirement (holder), breaking capacity (35A), and operating temperature range (-55°C to 125°C). These parts differ in approval agency certifications and melting I²t characteristics, which determine suitability for specific regional or application-specific compliance requirements.

Direct Manufacturer Equivalents (Cross-Brand): Part 0034.1515 (SCHURTER) and FSD-800MA (OptiFuse) meet all critical electrical and mechanical parameters: 800mA current, 250VAC voltage, fast-blow glass cartridge, 5x20mm package, 35A breaking capacity, and -55°C to 125°C operating range. These cross-brand alternatives provide substitution options when Littelfuse parts are unavailable.

Key Parameters Determining Substitution Eligibility:

Current Rating: 800 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Breaking Capacity: 35A (exact match required)

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Fuse Type	Response Time	Package	Breaking Capacity	Operating Temp	Melting I²t	DC Cold Resistance	Approval Agencies	Inventory (Pcs)
0217.800TXP	Littelfuse	800 mA	250 V	Cartridge, Glass	Fast Blow	5x20mm	35A	-55°C to 125°C	0.85	0.1203 Ω	CCC, CE, CSA, KC, SEMKO, UR, VDE	908
0217.800HXP	Littelfuse	800 mA	250 V	Cartridge, Glass	Fast Blow	5x20mm	35A	-55°C to 125°C	0.85	0.1203 Ω	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	1067
0217.800MXP	Littelfuse	800 mA	250 V	Cartridge, Glass	Fast Blow	5x20mm	35A	-55°C to 125°C	0.85	0.1203 Ω	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	1989
0235.800HXP	Littelfuse	800 mA	250 V	Cartridge, Glass	Fast Blow	5x20mm	35A	-55°C to 125°C	0.253	0.192 Ω	CE, CSA, KC, UL	1395
0235.800MXP	Littelfuse	800 mA	250 V	Cartridge, Glass	Fast Blow	5x20mm	35A	-55°C to 125°C	0.253	0.192 Ω	CE, CSA, KC, UL	2890
0034.1515	SCHURTER	800 mA	250 V	Cartridge, Glass	Fast Blow	5x20mm	35A	-55°C to 125°C	0.508	Not Specified	CCC, cURus, VDE	1844
FSD-800MA	OptiFuse	800 mA	250 V	Cartridge, Glass	Fast Blow	5x20mm	35A	-55°C to 125°C	0.5747	Not Specified	cURus, IEC 60127	4537

Engineering Selection Recommendations

Littelfuse Series 217 Parts (0217.800HXP, 0217.800MXP): These are direct parametric equivalents to the 0217.800TXP with identical melting I²t (0.85) and DC cold resistance (0.1203 Ω). Selection between these three Littelfuse 217 parts depends on regional certification requirements. The 0217.800TXP includes UR and KC approvals; the 0217.800HXP and 0217.800MXP include K-MARK and UL approvals. All three are active products with robust inventory levels.

Littelfuse Series 235 Parts (0235.800HXP, 0235.800MXP): These parts maintain electrical and mechanical compatibility but feature different thermal characteristics (melting I²t of 0.253 versus 0.85, and DC cold resistance of 0.192 Ω versus 0.1203 Ω). Series 235 parts carry fewer approval agencies (CE, CSA, KC, UL) compared to Series 217. Selection of Series 235 is appropriate when regional compliance requirements align with these certifications and when the lower melting I²t is acceptable for the application.

SCHURTER 0034.1515 (FSF 5x20 Series): This cross-brand alternative meets all critical electrical and mechanical parameters with a melting I²t of 0.508. It carries CCC, cURus, and VDE approvals. This part is suitable for applications where SCHURTER certification is acceptable and inventory availability is prioritized.

OptiFuse FSD-800MA: This cross-brand alternative provides the highest inventory availability (4537 pcs) and meets all electrical and mechanical requirements with a melting I²t of 0.5747. It carries cURus and IEC 60127 approvals. This part is suitable for applications where OptiFuse certification satisfies compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute 0217.800TXP with 0235.800HXP or 0235.800MXP?

A: Yes, from an electrical and mechanical standpoint. Both Series 235 parts share the same current rating (800mA), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), package dimensions (5x20mm), and breaking capacity (35A). However, Series 235 parts have different melting I²t values (0.253 versus 0.85) and DC cold resistance (0.192 Ω versus 0.1203 Ω). Verify that your application and regional compliance requirements accept the Series 235 certifications (CE, CSA, KC, UL) before substitution.

Q: What is the difference between 0217.800TXP, 0217.800HXP, and 0217.800MXP?

A: All three are Littelfuse Series 217 parts with identical electrical and mechanical specifications, including current rating, voltage, fuse type, package, and melting I²t (0.85). The differences lie in approval agency certifications. The 0217.800TXP includes UR and KC; the 0217.800HXP and 0217.800MXP include K-MARK and UL. Select based on your regional or application-specific certification requirements.

Q: Can I use SCHURTER 0034.1515 or OptiFuse FSD-800MA as a direct replacement?

A: Yes, both parts meet the critical electrical and mechanical parameters: 800mA current, 250VAC voltage, fast-blow glass cartridge, 5x20mm package, 35A breaking capacity, and -55°C to 125°C operating range. However, they differ in melting I²t values and approval agencies. Confirm that your application and regional compliance framework accept SCHURTER or OptiFuse certifications before substitution.

Q: Why do melting I²t values differ among these parts?

A: Melting I²t is a thermal characteristic that affects the fuse's response to overcurrent conditions. Different manufacturers and series employ different element designs, resulting in different I²t values. While all listed parts are fast-blow fuses rated at 800mA, 250VAC, their thermal response curves may differ. Verify that the substitute part's I²t is acceptable for your specific circuit protection requirements.

Q: Are all these parts RoHS3 compliant?

A: Yes, all listed parts are ROHS3 compliant. All are also REACH unaffected and carry ECCN EAR99 classification.

Q: What holder is required for these 5x20mm fuses?

A: All listed parts require a 5x20mm fuse holder. Ensure your circuit board or equipment uses a compatible holder designed for 5x20mm cartridge fuses. Holder compatibility is independent of the fuse manufacturer.

Q: Which part has the best inventory availability?

A: OptiFuse FSD-800MA has the highest inventory level at 4537 pcs. Littelfuse 0235.800MXP is the second highest at 2890 pcs. Littelfuse 0217.800MXP is third at 1989 pcs.

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