Product Specifications:
| Item | Time Delay Fuse |
| Ac Max I.r./breaking Capacity I1 | 200 kA |
| Ac Voltage | 600V AC |
| Ac/dc | AC/DC |
| Amps | 2500A |
| Body Material | Glass, Melamine |
| Body Style | Blade |
| Body/insulating Material | GMG |
| Class | L |
| Connection/terminal Material | Copper |
| Connection/terminal Type | Blade |
| Dc Voltage Rating | 300V DC |
| Diameter | 114.3 mm |
| Element | Dual |
| Equivalent Brand And Series | Bussmann Klu, Bussmann Ktu, Littelfuse Kllu, Littelfuse Klpc, Mersen/Ferraz Shawmut A4By |
| Equivalent Series | A4By, Kllu, Klpc, Klu, Ktu |
| Finish | Silver Plated |
| Fits Fuse Block Style | Nonrejection |
| Frame Type | A4BY |
| Frequency | 50/60 Hz |
| Fuse Class | Class L |
| Fuse Dia. | 4 1/2" |
| Fuse Length | 10 3/4" |
| Fuse Size | 10 3/4" x 4 1/2" |
| Interrupt Rating | 100 kA @ 300V DC, 200 kA @ 600V AC |
| Length | 10 3/4" |
| Mounting | Bolted |
| Number Of Poles | 1 |
| Product Datasheet | mersen-ferraz-a4by1000.pdf |
| Product Group | Low Voltage UL/CSA Fuses |
| Rated Voltage Ac Ul | 600V |
| Rated Voltage Dc Ul | 300V |
| Rohs Compliant | Yes |
| Series | A4BY Series |
| Speed | Time Delay |
| Speed Characteristic | Time Delay |
| Speed Type | Time Delay |
| Standards | Csa, Ul |
| Visual Indication | Non Indicating |
| Voltage | 600V |
| Voltage Type | AC |
Shipping Info:
| Ship weight (kg) | 7.23 |
| Ship height (cm) | 11.73 |
| Ship length (cm) | 29.85 |
| Ship width (cm) | 12.85 |
| Country of Origin | MX |
Documentation:
Product Variants
| Product | Model | Amps | Diameter | Body Material | Fuse Dia. | Fuse Length | Dc Voltage Rating | Speed | Body Style | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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A4BY1000 | 1000A | 2 1/2" | Glass, Melamine | 2 1/2" | 10 3/4" | 300V DC | Time Delay | Blade | €906.35 | |
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A4BY1200 | 1200A | 2 1/2" | Glass, Melamine | 2 1/2" | 10 3/4" | 300V DC | Time Delay | Blade | €1,377.64 | |
![]() |
A4BY1400 | 1400A | 3" | Glass, Melamine | 3" | 10 3/4" | 300V DC | Time Delay | Blade | €1,295.56 | |
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A4BY1500 | 1500A | 3" | Glass, Melamine | 3" | 10 3/4" | 300V DC | Time Delay | Blade | €1,678.36 | |
![]() |
A4BY1600 | 1600A | 3" | Glass, Melamine | 3" | 10 3/4" | 300V DC | Time Delay | Blade | €1,508.84 | |
![]() |
A4BY1800 | 1800A | 3 1/2" | Glass, Melamine | 3 1/2" | 10 3/4" | 300V DC | Time Delay | Blade | €1,780.58 | |
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A4BY2000 | 2000A | 3 1/2" | Glass, Melamine | 3 1/2" | 10 3/4" | 300V DC | Time Delay | Blade | €2,514.47 |
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Contact us
Contact your account manager right away to get personal advice.
We're available Monday through Friday, from 07:30 until 17:00.
MERSEN FERRAZ A4BY2500 Time Delay Fuse, 600V, 2500A, Class L, 1 Pole
€2,094.61 /unit







