S501-400-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Eaton S501-400-R is an active-status ceramic cartridge fuse rated for 400 mA at 250 V AC/DC with fast-blow response characteristics. This 5mm x 20mm form factor fuse requires a compatible holder for installation and is designed for circuit protection applications requiring rapid fault interruption. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and regulatory compliance standards.

Substiute Parts

S501-400-R

Eaton - Electronics DivisionIn Stock: 1016S501-400-R Datasheet

Current PartRFQ

BK1/S501-400-R

Eaton - Electronics DivisionIn Stock: 1665BK1/S501-400-R Datasheet

Parametric EquivalentRFQ

GDA-400MA

Eaton - Electronics DivisionIn Stock: 1150GDA-400MA Datasheet

Parametric EquivalentRFQ

FCD-400MA

OptiFuseIn Stock: 5875FCD-400MA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S501-400-R are qualified based on the following criteria:

Electrical Parameters (Critical):

• Current Rating: 400 mA
• Voltage Rating (AC): 250 V
• Response Time: Fast Blow
• Breaking Capacity: 1.5 kA

Mechanical Parameters (Critical):

• Package / Case: 5mm x 20mm
• Mounting Type: Requires Holder
• Fuse Type: Cartridge, Ceramic

Performance Parameters:

• DC Cold Resistance: 2.2 Ohms
• Melting I²t: 0.018 to 0.02

All substitute parts listed maintain identical electrical and mechanical specifications, ensuring direct functional equivalence in circuit protection applications. Variations in operating temperature range and regulatory certifications are noted but do not affect substitution eligibility for standard applications.

Parameter Comparison

Engineering Selection Recommendations

All four parts listed—S501-400-R, BK1/S501-400-R, GDA-400MA, and FCD-400MA—are active-status products suitable for direct substitution in 400 mA, 250 V AC ceramic fuse cartridge applications.

Eaton S501 Series (S501-400-R and BK1/S501-400-R): Both parts carry CSA and cURus certifications. The BK1/S501-400-R variant offers higher inventory availability (1631 pcs vs. 972 pcs) and includes REACH Unaffected status documentation.

Eaton GDA Series (GDA-400MA): This part carries CSA and UR certifications and maintains identical electrical and mechanical specifications. Inventory availability is 1085 pcs.

OptiFuse FCD Series (FCD-400MA): This part carries IEC 60127 certification and specifies an operating temperature range of -55°C to 125°C. The melting I²t value is 0.02 compared to 0.018 for Eaton parts. Inventory availability is highest at 5801 pcs.

Selection among these parts depends on certification requirements specific to the application, operating temperature constraints, and inventory availability. All parts are mechanically and electrically interchangeable for standard circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can FCD-400MA be used as a direct replacement for S501-400-R?

A: Yes. Both parts share identical current rating (400 mA), voltage rating (250 V AC), response time (Fast Blow), package dimensions (5mm x 20mm), breaking capacity (1.5 kA), and DC cold resistance (2.2 Ohms). The melting I²t value differs slightly (0.02 vs. 0.018), but both parts maintain the same fast-blow response classification.

Q: What is the difference between S501-400-R and BK1/S501-400-R?

A: Both parts are manufactured by Eaton and share identical electrical and mechanical specifications. The BK1/S501-400-R variant includes REACH Unaffected status documentation and has higher inventory availability.

Q: Are all substitute parts certified to the same standards?

A: No. S501-400-R and BK1/S501-400-R carry CSA and cURus certifications. GDA-400MA carries CSA and UR certifications. FCD-400MA carries IEC 60127 certification. Application requirements determine which certification is necessary.

Q: Does the operating temperature range affect substitution?

A: FCD-400MA specifies an operating temperature range of -55°C to 125°C. Eaton parts do not specify an operating temperature range in the provided data. For applications requiring operation outside standard temperature ranges, FCD-400MA provides documented temperature performance.

Q: Can these fuses be used in both AC and DC circuits?

A: All parts are rated for 250 V AC. FCD-400MA explicitly specifies 250 V DC rating. For DC applications, FCD-400MA provides documented DC voltage compatibility.

Q: What holder type is required for these fuses?

A: All parts are 5mm x 20mm ceramic cartridge fuses requiring a compatible 5mm x 20mm fuse holder. Holder selection is independent of fuse manufacturer.