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Equivalent & Substitute Parts for BK1/ABC-20EX-R
Part Overview
The BK1/ABC-20EX-R is a 20 A ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated for 250 V AC and 125 V DC operation. This fast-blow fuse is designed for use with 3AB, 3AG holders and measures 0.250" diameter by 1.250" length (6.35mm x 31.75mm). The part maintains Active product status and is ROHS3 compliant.
Equivalent and substitute parts are identified when alternative manufacturers or series designations provide identical electrical and mechanical performance within the specified parameter tolerances. This reference enables component procurement flexibility while maintaining circuit protection integrity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 20 A |
| Voltage Rating - AC | 250 V |
| Voltage Rating - DC | 125 V |
| Fuse Type | Cartridge, Ceramic |
| Response Time | Fast Blow |
| Package / Case | 3AB, 3AG, 1/4" x 1-1/4" |
| Size / Dimension | 0.250" Dia x 1.250" L (6.35mm x 31.75mm) |
| Mounting Type | Requires Holder |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict equivalence across the following critical parameters:
Mandatory Matching Parameters:
- Current Rating: 20 A
- Voltage Rating - AC: 250 V
- Voltage Rating - DC: 125 V
- Fuse Type: Cartridge, Ceramic
- Response Time: Fast Blow
- Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
- Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
- Mounting Type: Requires Holder
All substitute parts listed meet these mandatory parameters. Variations in Breaking Capacity, Melting I²t, DC Cold Resistance, and Approval Agencies are documented but do not disqualify substitution eligibility when core electrical and mechanical specifications align.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Series | Current Rating (A) | Voltage AC (V) | Voltage DC (V) | Response Time | Breaking Capacity AC | Breaking Capacity DC | Melting I²t | DC Cold Resistance (Ohms) | Approval Agency | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BK1/ABC-20EX-R | Eaton - Electronics Division | ABC | 20 | 250 | 125 | Fast Blow | 400A | 10kA | 550.8 | 0.00366 | CSA, UR | Active |
| ABC-20-R | Eaton - Electronics Division | ABC | 20 | 250 | 125 | Fast Blow | 400A | 10kA | 550.8 | 0.00366 | CSA, UL | Active |
| BK/ABC-20-R | Eaton - Electronics Division | ABC | 20 | 250 | 125 | Fast Blow | 400A | 10kA | 550.8 | 0.00366 | CSA, UL | Active |
| BK/GBB-20-R | Eaton - Electronics Division | GBB | 20 | 250 | 125 | Fast Blow | 200A | 10kA | Not Provided | 0.0033 | CSA, UR | Active |
| 0314020.HXP | Littelfuse Inc. | 314 | 20 | 250 | 125 | Fast Blow | 200A | 10kA | 631 | 0.00355 | CE, CSA, PSE, UL | Active |
| 0314020.MXP | Littelfuse Inc. | 314 | 20 | 250 | 125 | Fast Blow | 200A | 10kA | 631 | 0.00355 | CE, CSA, PSE, UL | Active |
| 0314020.VXP | Littelfuse Inc. | 314 | 20 | 250 | 125 | Fast Blow | 1kA | 10kA | 631 | 0.00355 | CE, CSA, KC, PSE, UL | Active |
Engineering Selection Recommendations
Eaton ABC Series (Direct Equivalents): ABC-20-R and BK/ABC-20-R are direct parametric equivalents to BK1/ABC-20EX-R. All three parts share identical electrical specifications, Breaking Capacity ratings, and Melting I²t values. ABC-20-R and BK/ABC-20-R carry UL certification in addition to CSA approval, providing expanded compliance coverage. These parts are recommended for applications requiring maximum compatibility with the original specification.
Eaton GBB Series (Reduced Breaking Capacity): BK/GBB-20-R maintains all core electrical parameters but features reduced AC Breaking Capacity (200A versus 400A). This part is suitable for applications where lower fault current levels are present. DC Cold Resistance is marginally lower (0.0033 Ohms versus 0.00366 Ohms), representing negligible operational difference.
Littelfuse 314 Series (Cross-Manufacturer Substitutes): 0314020.HXP, 0314020.MXP, and 0314020.VXP are Littelfuse equivalents meeting all mandatory electrical and mechanical parameters. These parts feature higher Melting I²t values (631 versus 550.8) and expanded operating temperature range (-55°C to 125°C). Breaking Capacity ratings vary: 0314020.HXP and 0314020.MXP provide 200A AC, while 0314020.VXP provides 1kA AC. All three carry CE, CSA, and UL certifications. 0314020.VXP includes additional KC (Korea) approval.
Compliance Considerations: All substitute parts maintain ROHS3 compliance and Active product status. Selection should account for specific approval agency requirements in the target application region.
Frequently Asked Questions (FAQ)
Q: Can ABC-20-R be used as a direct replacement for BK1/ABC-20EX-R?
A: Yes. ABC-20-R is a parametric equivalent with identical current rating (20 A), voltage ratings (250 V AC / 125 V DC), fuse type (ceramic cartridge), response time (fast blow), and physical dimensions (0.250" x 1.250"). Both require 3AB/3AG holders. The primary difference is certification scope: ABC-20-R includes UL approval while BK1/ABC-20EX-R includes UR approval.
Q: What is the difference between Eaton ABC and GBB series fuses?
A: Both series meet the 20 A, 250 V AC / 125 V DC specification and share identical physical dimensions. The primary distinction is Breaking Capacity: ABC series provides 400A AC breaking capacity, while GBB series provides 200A AC. DC Cold Resistance differs slightly (0.00366 Ohms for ABC versus 0.0033 Ohms for GBB). Selection depends on the maximum fault current expected in the circuit.
Q: Are Littelfuse 314 series fuses compatible with Eaton ABC holders?
A: Yes. Littelfuse 0314020.HXP, 0314020.MXP, and 0314020.VXP share the identical 3AB/3AG package specification and 0.250" x 1.250" physical dimensions as the Eaton parts. They are mechanically and electrically compatible with the same holder assemblies.
Q: What does the suffix designation (.HXP, .MXP, .VXP) indicate on Littelfuse parts?
A: The suffix designates different approval agency combinations and Breaking Capacity ratings. .HXP and .MXP both provide 200A AC breaking capacity with CE, CSA, PSE, and UL approvals. .VXP provides 1kA AC breaking capacity with additional KC (Korea) certification. All three share identical 20 A current rating, voltage ratings, and physical dimensions.
Q: Can I substitute a part with lower Breaking Capacity?
A: Substitution with lower Breaking Capacity is permissible only when the application's maximum available fault current does not exceed the substitute part's rated Breaking Capacity. For example, BK/GBB-20-R (200A AC) can replace BK1/ABC-20EX-R (400A AC) only in circuits where fault current remains below 200A AC.
Q: What is the significance of Melting I²t values?
A: Melting I²t indicates the thermal energy required to melt the fuse element. BK1/ABC-20EX-R and Eaton ABC series specify 550.8, while Littelfuse 314 series specifies 631. Higher I²t values indicate slightly slower thermal response. Both values are within the fast-blow classification for 20 A ceramic cartridge fuses.
Q: Are all listed substitutes ROHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 Compliant status, meeting hazardous substance restrictions for electronic components.
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