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Product Specifications:
| Item | Time Delay Fuse |
| Ac Max. I R Breaking Capacity I1 | 200 kA |
| Ac Voltage | 600V AC |
| Ac/dc | AC/DC |
| Amps | 801A |
| Body Material | Glass, Melamine |
| Body Style | Blade |
| Body/insulating Material | GMG |
| Class | L |
| Connection/terminal Material | Copper |
| Connection/terminal Type | Blade |
| Dc Voltage | 300V DC |
| Dia. | 2 1/2" |
| Element | Dual |
| Equivalent Brand And Series | Bussmann Klu, Bussmann Ktu, Littelfuse Kllu, Littelfuse Klpc, Mersen 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. | 2 1/2" |
| Fuse Length | 10 3/4" |
| Fuse Size | 10 3/4" x 2 1/2" |
| Interrupt Rating | 100 kA @ 300V DC, 200 kA @ 600V AC |
| Length | 10 3/4" |
| Mounting | Bolted |
| No. 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 |
| Visual Indication | Non Indicating |
| Voltage | 600V |
| Voltage Type | AC |
Shipping Info:
| Ship weight (kg) | 2.13 |
| Ship height (cm) | 8.26 |
| Ship length (cm) | 27.94 |
| Ship width (cm) | 8.59 |
| Country of Origin | MX |
Documentation:
Product Variants
| Product | Model | Amps | Dia. | Fuse Length | Fuse Dia. | Fuse Size | Indication System Type | Ac Voltage | Speed Type | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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A4BY1000 | 1000A | 2 1/2" | 10 3/4" | 2 1/2" | 10 3/4" x 2 1/2" | - | 600V AC | Time Delay | €925.63 | |
![]() |
A4BY1200 | 1200A | 2 1/2" | 10 3/4" | 2 1/2" | 10 3/4" x 2 1/2" | - | 600V AC | Time Delay | €864.09 | |
![]() |
A4BY1400 | 1400A | 3" | 10 3/4" | 3" | 10 3/4" x 3" | - | 600V AC | Time Delay | €1,347.37 | |
![]() |
A4BY1500 | 1500A | 3" | 10 3/4" | 3" | 10 3/4" x 3" | - | 600V AC | Time Delay | €1,849.55 | |
![]() |
A4BY1600 | 1600A | 3" | 10 3/4" | 3" | 10 3/4" x 3" | - | 600V AC | Time Delay | €1,253.74 | |
![]() |
A4BY1800 | 1800A | 3 1/2" | 10 3/4" | 3 1/2" | 10 3/4" x 3 1/2" | - | 600V AC | Time Delay | €1,823.98 | |
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A4BY2000 | 2000A | 3 1/2" | 10 3/4" | 3 1/2" | 10 3/4" x 3 1/2" | - | 600V AC | Time Delay | €1,508.41 |
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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 A4BY801 Time Delay Fuse, 600V, 801A, Class L, 1 Pole
€1,253.74 /unit







