SCHURTER 0034.3103 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3103 is a 40 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm package format. This component is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain circuit protection functionality in applications where the original part is no longer available from the manufacturer.

Key Parameters

Parameter	Value
Current Rating	40 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.3103 is determined by the following critical parameters:

Current Rating: 40 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Breaking Capacity @ Rated Voltage: 35A minimum

All substitute parts listed meet these core electrical and mechanical requirements. Parts are categorized as Direct Manufacturer equivalents, Similar alternatives, or Parametric equivalents based on additional performance characteristics such as melting I²t, DC cold resistance, and approval agency certifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	Inventory (Pcs)
0034.3103	SCHURTER Inc.	40	250	Slow Blow	5x20mm	35	0.0027	—	Obsolete	1174
0218.040HXP	Littelfuse Inc.	40	250	Slow Blow	5x20mm	35	0.00536	35.7	Active	720
0218.040MXP	Littelfuse Inc.	40	250	Slow Blow	5x20mm	35	0.00536	35.7	Active	1286
BK/S506-40-R	Eaton - Electronics Division	40	250	Slow Blow	5x20mm	35	0.0072	13.9	Active	844
BK/GDC-40MA	Eaton - Electronics Division	40	250	Slow Blow	5x20mm	35	0.0072	13.9	Active	1036
BK1/S506-40-R	Eaton - Electronics Division	40	250	Slow Blow	5x20mm	35	0.0072	13.9	Active	919
S506-40-R	Eaton - Electronics Division	40	250	Slow Blow	5x20mm	35	0.0072	13.9	Active	1081
0218.040MXBP	Littelfuse Inc.	40	250	Slow Blow	5x20mm	35	0.011	31.862	Active	760
0218.040TXP	Littelfuse Inc.	40	250	Slow Blow	5x20mm	35	0.011	31.862	Active	800
0218.040VXP	Littelfuse Inc.	40	250	Slow Blow	5x20mm	35	0.011	31.862	Active	728
0219.040MXAP	Littelfuse Inc.	40	250	Slow Blow	5x20mm	35	0.011	31.862	Active	964

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Littelfuse 218 Series)

The Littelfuse 0218.040HXP and 0218.040MXP are direct functional equivalents with active product status. Both parts carry comprehensive approval certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. The 0218.040MXP offers higher inventory availability (1286 pcs) compared to 0218.040HXP (720 pcs). Both maintain the same electrical specifications and operating temperature range as the original SCHURTER part.

Direct Manufacturer Equivalents (Eaton S506 Series)

The Eaton BK/S506-40-R, BK1/S506-40-R, and S506-40-R are functionally equivalent alternatives with active product status. These parts carry BSI, CCC, IMQ, SEMKO, UL, and VDE certifications. The S506-40-R variant offers the highest inventory level (1081 pcs). All three Eaton variants feature lower DC cold resistance (13.9 Ω) compared to Littelfuse alternatives, which may be relevant in low-voltage circuit applications.

Parametric Equivalents (Littelfuse 218 and 219XA Series)

The Littelfuse 0218.040MXBP, 0218.040TXP, 0218.040VXP, and 0219.040MXAP are parametric equivalents with higher melting I²t values (0.011 vs. 0.0027 for the original part). The 0219.040MXAP features enhanced breaking capacity (150A vs. 35A) and carries CE, SEMKO, and UL certifications. These parts are suitable for applications requiring extended thermal response characteristics.

Eaton GDC Series Alternative

The Eaton BK/GDC-40MA is a similar alternative with active product status and cULus and IMQ certifications. This part carries lower approval agency coverage compared to the S506 series variants.

All substitute parts maintain ROHS3 compliance and are rated for the same -55°C to 125°C operating temperature range as the original SCHURTER component.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the SCHURTER 0034.3103?

A: All listed substitute parts meet the core electrical and mechanical requirements: 40 mA current rating, 250 V AC voltage rating, slow-blow response time, and 5mm x 20mm package format. Physical installation compatibility depends on the fuse holder design in your application. Verify that the substitute part fits the existing holder without modification.

Q: What is the difference between the Littelfuse and Eaton alternatives?

A: The primary differences are melting I²t and DC cold resistance values. Littelfuse 0218.040HXP and 0218.040MXP have melting I²t of 0.00536 and DC cold resistance of 35.7 Ω. Eaton S506 series parts have melting I²t of 0.0072 and DC cold resistance of 13.9 Ω. These differences affect thermal response characteristics and may impact circuit behavior in specific applications. Littelfuse parametric equivalents (0218.040MXBP, 0218.040TXP, 0218.040VXP, 0219.040MXAP) have higher melting I²t values (0.011).

Q: Which substitute part has the best availability?

A: The Littelfuse 0218.040MXP offers the highest inventory level at 1286 pieces in stock, followed by the Eaton S506-40-R at 1081 pieces.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are RoHS3 compliant, matching the compliance status of the original SCHURTER 0034.3103.

Q: What approval certifications should I prioritize?

A: The Littelfuse 0218.040HXP and 0218.040MXP carry the broadest certification coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). The Eaton S506 series (BK/S506-40-R, BK1/S506-40-R, S506-40-R) also carry comprehensive certifications (BSI, CCC, IMQ, SEMKO, UL, VDE). Select based on the specific regulatory requirements of your application region.

Q: Can I use the 0219.040MXAP with its higher breaking capacity (150A)?

A: The 0219.040MXAP is electrically compatible as a substitute. The higher breaking capacity (150A vs. 35A) provides additional safety margin in fault conditions. This part is suitable for applications where enhanced fault protection is beneficial or required.

Q: What is the significance of DC cold resistance differences?

A: DC cold resistance affects voltage drop across the fuse during normal operation. Lower resistance (Eaton S506 series at 13.9 Ω) results in minimal voltage drop. Higher resistance (Littelfuse 218 series at 35.7 Ω) may introduce measurable voltage drop in low-voltage, high-current circuits. Select based on your circuit's voltage and current characteristics.

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