Equivalent & Substitute Parts for SS-5-4A-AP

Part Overview

The SS-5-4A-AP is a board mount fuse manufactured by Eaton - Electronics Division, rated for 4 A at 250 V AC/DC with slow blow response characteristics. This through-hole radial fuse is designed for PCB integration in applications requiring overcurrent protection. The part maintains active product status with 12,300 units in current inventory. Substitute parts are identified to address inventory availability, extended certification coverage, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

SS-5-4A-AP

Eaton - Electronics DivisionIn Stock: 12403SS-5-4A-AP Datasheet

Current PartRFQ

SS-5H-4A-AP

Eaton - Electronics DivisionIn Stock: 2425SS-5H-4A-AP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution between SS-5-4A-AP and SS-5H-4A-AP is based on the following critical parameters that must remain constant:

• Current Rating: Both parts rated at 4 A
• Voltage Rating (AC): Both rated at 250 V
• Response Time: Both classified as Slow Blow
• Mounting Type: Both are Through Hole
• Package / Case: Both use Radial, Box configuration
• Physical Dimensions: Identical at 0.335" L x 0.169" W x 0.329" H
• Operating Temperature Range: Both operate from -40°C to 125°C
• Melting I²t: Both rated at 87

These parameters define the functional and mechanical interchangeability of the substitute part. Variations in breaking capacity, DC cold resistance, approval agencies, and RoHS compliance levels do not affect the core substitution relationship.

Parameter Comparison

Engineering Selection Recommendations

Both SS-5-4A-AP and SS-5H-4A-AP maintain active product status and are manufactured by Eaton - Electronics Division. Selection between these parts is determined by application-specific requirements:

SS-5-4A-AP is the primary choice when:

• Higher inventory availability is required
• Certifications include cULus, EK-MARK, or SEMKO
• Lower DC cold resistance (0.01275 Ohms) is specified
• Breaking capacity of 40 A is sufficient

SS-5H-4A-AP is the alternative when:

• Extended certification coverage is required (KC, PSE, TUV)
• Higher breaking capacity (100 A) is necessary
• ROHS3 compliance is mandated
• Moisture sensitivity level specification (MSL 1 - Unlimited) is required

Both parts are electrically and mechanically interchangeable for the core fuse function. The differences in breaking capacity and DC cold resistance do not affect substitution eligibility but must be evaluated against specific circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can SS-5H-4A-AP replace SS-5-4A-AP in existing designs?

A: Yes. Both parts share identical current rating (4 A), voltage rating (250 V), response time (Slow Blow), mounting type (Through Hole), package configuration (Radial, Box), physical dimensions, and operating temperature range. These parameters define functional compatibility.

Q: What is the difference in breaking capacity between these parts?

A: SS-5-4A-AP has a breaking capacity of 40 A at rated voltage, while SS-5H-4A-AP has 100 A. Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Selection depends on the maximum prospective short-circuit current in the application.

Q: Why do the DC cold resistance values differ?

A: SS-5-4A-AP has 0.01275 Ohms while SS-5H-4A-AP has 12 Ohms. This difference reflects internal construction variations. DC cold resistance affects voltage drop under normal operating current and heat generation. Applications sensitive to voltage drop or thermal performance must account for this parameter.

Q: Are the approval certifications equivalent?

A: Both parts carry overlapping certifications (CQC, VDE). SS-5-4A-AP includes cULus, EK-MARK, and SEMKO. SS-5H-4A-AP includes cURus, KC, PSE, and TUV. Selection depends on regional regulatory requirements for the end application.

Q: Is the physical footprint identical?

A: Yes. Both parts measure 0.335" L x 0.169" W x 0.329" H (8.50mm x 4.30mm x 8.35mm) and use identical radial, box package configuration. PCB layout and mounting hole spacing are compatible.

Q: What does RoHS3 compliance mean compared to RoHS Compliant?

A: SS-5-4A-AP is RoHS Compliant (standard RoHS). SS-5H-4A-AP is ROHS3 Compliant, which represents the third iteration of RoHS regulations with updated restricted substance limits. ROHS3 is a superset of earlier RoHS requirements.

Q: Which part should be selected for new designs?

A: Selection is based on application requirements. Evaluate breaking capacity requirements, DC cold resistance impact on circuit performance, and regional certification needs. Both parts are active and suitable for new designs.