A4BT / Class L / 10-Second Time Delay
The A4BT / Class L / 10-Second Time Delay is part of the Mersen (formerly Ferraz Shawmut) general purpose fuses line, distributed by Gross Automation.

When your heavier loads need protection, Ferraz A4BT fuses won't let you down - The high interrupting rating of A4BT current limiting fuses is ideally suited for protecting mains, feeders, and general circuits. The 10-second time delay at 500% of fuse rating is ideal for large motors and other loads with a high inrush. A4BT fuses are suitable for DC applications up to 500VDC. An A4BT fuse can be applied to normal loads up to its full ampere rating to allow 100% rating of equipment.
Specifications
| Specification | Value |
|---|---|
| Ratings | AC: 600VAC, 200kA I.R.; AC: 500VDC, 100kA I.R. (Ferraz Shawmut Certified); UL Listed to Standard 248-10; CSA Certified to Standard C22.2 No. 248.10; DC Tested to UL 198L limits (Ferraz Shawmut Certified); Some ratings RoHS Compliant; Motors; Motor Controllers; Transformers; Mains; Feeders |
| Features | Unique dimensions prevent replacement by other fuse classes.; Blade-stamped catalog numbers for permanent identification; Glass melamine body and plated terminals provide superior reliability in harsh environments; Current-limiting; Full 10-second time delay; DC ratings; Uniform characteristics in all ampere ratings |
Features
- Unique dimensions prevent replacement by other fuse classes.
- Blade-stamped catalog numbers for permanent identification
- Glass melamine body and plated terminals provide superior reliability in harsh environments
- Current-limiting
- Full 10-second time delay
- DC ratings
- Uniform characteristics in all ampere ratings
Ratings
- AC: 600VAC, 200kA I.R.
- AC: 500VDC, 100kA I.R. (Ferraz Shawmut Certified)
- UL Listed to Standard 248-10
- CSA Certified to Standard C22.2 No. 248.10
- DC Tested to UL 198L limits (Ferraz Shawmut Certified)
- Some ratings RoHS Compliant
- Motors
- Motor Controllers
- Transformers
- Mains
- Feeders
Catalog Numbers
| Catalog Number | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 | Column 7 | Column 8 |
|---|---|---|---|---|---|---|---|
| 200 | A4BT200 | 500 | A4BT500 | 800 | A4BT800 | 1500 | A4BT1500 |
| 250 | A4BT250 | 600 | A4BT600 | 900 | A4BT900 | 1600 | A4BT1600 |
| 300 | A4BT300 | 601 | A4BT601 | 1000 | A4BT1000 | 1800 | A4BT1800 |
| 350 | A4BT350 | 650 | A4BT650 | 1100 | A4BT1100 | 2000 | A4BT2000 |
| 400 | A4BT400 | 700 | A4BT700 | 1200 | A4BT1200 | ||
| 450 | A4BT450 | 750 | A4BT750 | 1400 | A4BT1400 |