Gruber Power Services supplies high-performance uninterruptible power system (UPS) fuses engineered specifically for mission-critical power environments. These high-current, fast-acting, and current-limiting fuses protect rectifiers, battery strings, bypass circuits, inverter assemblies, and input/output distribution sections from catastrophic fault conditions that can result in extended downtime or severe equipment damage.
In modern UPS systems, proper fuse coordination is essential to maintaining selectivity and preventing nuisance trips while still ensuring rapid isolation during short circuits or overload events.
Our inventory includes AC and DC rated designs, semiconductor protection fuses for IGBT modules, high-amp bolt-on configurations, and battery string protection fuses designed for elevated DC voltages.
Each fuse is selected based on voltage class, interrupt rating (AIC), mounting style, and manufacturer specifications to ensure full compatibility with your system.
Whether you’re maintaining a data center, hospital, telecom facility, industrial plant, or government installation, proper fuse protection safeguards your UPS investment and minimizes operational risk.
We stock and source major brands including Bussmann, Ferraz Shawmut, Littelfuse,
along with other OEM-approved solutions for APC, Eaton, Liebert, Mitsubishi, Toshiba, and many additional UPS platforms. Our technical team can assist with cross-referencing part numbers and confirming exact electrical specifications to ensure safe, reliable replacement in the field.
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If you’re unsure which fuse your system requires, our technicians can cross-reference your
UPS make, model, and kVA rating to ensure correct voltage class,
interrupt rating, and physical mounting style.
| Fuse Type | Style / Mounting | Typical UPS Use | Notes |
|---|---|---|---|
| High-Speed / Semiconductor |
Square-body (DIN 43620) Blade / Flat contact Bolt-down terminations |
IGBT / SCR protection, rectifier/inverter sections | Very fast acting; designed to protect power semiconductors. |
| Current-Limiting |
Cylindrical (Class J / CC / RK) Ferrule or clip-in holders |
Control power, auxiliary feeds, smaller UPS inputs | Limits peak fault current; common in branch circuits. |
| High-Amp AC (Power) |
Bolt-on “knife-blade” / stud mount Square-body power fuses |
UPS input, bypass, output distribution (high current) | Verify voltage class & interrupt rating (AIC) before replacement. |
| DC Rated (Battery String) |
Bolt-on / stud mount Inline battery fuse blocks |
Battery cabinets, DC bus protection, string isolation | Must be DC rated for the system voltage (125V/250V/480V DC, etc.). |
| Time-Delay / Slow-Blow |
Cartridge (Class RK5/RK1, etc.) Holder/clip mount |
Transformer inrush, fan feeds, some charger circuits | Tolerates short inrush surges while still protecting downstream wiring. |
| Fast-Acting |
Cartridge / glass / ceramic Holder/clip mount |
Control boards, sensing circuits, low-power protection | Quick response; match the exact rating to avoid nuisance blows. |
