Eaton Bussmann
Bussmann EVH-125 | 125A 70VDC Fuse, 6kA AIC, MEGA Footprint
Bussmann EVH-125 | 125A 70VDC Fuse, 6kA AIC, MEGA Footprint
Couldn't load pickup availability
The Eaton Bussmann EVH-125 is a 125 A bolt-down DC fuse rated 70 VDC with a 6,000 A interrupting rating, built to the ISO 20934 Type SF51 footprint — the same bolt pattern as a standard MEGA fuse. It drops into an existing MEGA position while more than doubling the voltage rating and tripling the breaking capacity. UL certified.
Why the 70 VDC rating matters
Most MEGA-format fuses are rated 32 VDC. A 48 V nominal LiFePO₄ bank charges to 58.4 V — well above that rating. DC faults have no zero-crossing to help quench the arc, so a fuse asked to interrupt above its rated voltage may not clear the fault. The EVH is rated 70 VDC, which covers 12 V, 24 V and 48 V nominal systems with margin.
Interrupting capacity and lithium banks
The 2025 revision to ABYC E-11 sets the interrupting-capacity requirement for lithium-ion batteries at 5,000 A for every 100 Ah of capacity, and calls for overcurrent protection at each individual battery on banks above 500 Ah. On that basis a 6,000 A device covers a single battery of roughly 120 Ah or less, and suits the per-battery position inside a larger bank. Main protection on a large bank still belongs to a Class T fuse sized to the whole bank.
These figures reflect our reading of the 2025 revision and are given for general guidance. Confirm the requirement against the current published standard for your application.
Specifications
| Rated current | 125 A |
| Rated voltage | 70 VDC |
| Interrupting rating | 6,000 A @ 70 VDC (TC = 2 ± 0.5 ms) |
| Bolt size | M8 (8.55 mm holes) |
| Certification | UL certified |
| Max voltage drop | 110 mV at rated current |
| Pre-arcing I²t | 57,000 A²s |
| Total I²t | 68,400 A²s |
| Recommended conductor | 16 mm² (approx. 6 AWG) |
| Operating temperature | −40 °C to +125 °C |
| Housing / terminals | PPA / matt tin-plated copper |
| Standard reference | ISO 20934-2019 Type SF51 |
| Compliance | RoHS and ELV |
Installation
- Bolt centres 50.9 mm, overall length 68 mm, body height 9.9 mm — standard MEGA spacing.
- M8 terminal bolts. Torque to 20 N·m ±1. Do not overtorque; the terminals are tin-plated copper.
- Holds 100% of rated current for at least 4 hours. Opens in 1–15 s at 200% of rating and 0.3–5 s at 350%.
Typical applications
Battery-to-busbar protection on a single lithium battery up to about 120 Ah, per-battery protection inside a larger bank, DC-DC charger and alternator circuits, solar charge controller output, and any 48 V branch presently protected by a 32 V MEGA fuse.
This is not a substitute for a Class T fuse as the main overcurrent device on lithium banks above roughly 120 Ah, where the required interrupting capacity exceeds 6,000 A.
Not sure which rating you need? Jonsson Tech designs, installs and commissions these systems — send us your one-line and we will check it before you order.
Share
