Form 101 Ultra-Rapid Semiconductor Fuses (Type UFR)
DENCO Form 101 fuses are American-standard, cylindrical ultra-rapid semiconductor fuses, Type UFR. The catalog lists voltages from 130V to 1500V and currents from 1A to 2000A, with an interrupting rating of 200kA AC and 100kA DC. They are current limiting with low I²t, and indicator options are available.
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Page 98 breaks the range down by voltage: 130V and 250V from 1A to 2000A, 500V and 600V from 1A to 1600A, 700V from 1A to 800A, and 1000V from 1A to 1000A. The headline voltage list also includes 1200V and 1500V, which are not broken out by amperage. The dimension page (p.99) is headed 130V to 700V, 5A to 1200A.
The catalog describes the series as fast acting and current limiting, with high interrupting capacity and strong DC capability. Page 100 prints the electrical characteristics for selection: a pre-arcing time-current curve, an I²t correction curve against operating voltage, maximum arc voltage against circuit voltage, a watt loss correction curve against percent rated current, and a correction factor against air flow speed.
Specifications
| Parameter | Value |
|---|---|
| Voltages | 130V, 250V, 500V, 600V, 700V, 1000V, 1200V, 1500V |
| Ampere range | 1A to 2000A |
| 130V and 250V | 1A to 2000A |
| 500V and 600V | 1A to 1600A |
| 700V | 1A to 800A |
| 1000V | 1A to 1000A |
| Interrupting rating | 200kA AC, 100kA DC |
| Body | Cylindrical, American standard |
Construction and options
- Indicator options available
- High breaking capacity
- Low power dissipation
- High current limiting
- Silver plated contacts
- Low I²t
- Low switching voltage
- Extremely short times
Applications
- Thyristors, triacs, diodes and other solid-state components
- Electrochemical rectifiers
- Heavy-duty power supplies with low I²t
- DC drives
- UPS
- Motor drives
- Inverters
- Heavy traction and heavy-duty equipment
Curves and drawings
The catalog prints the following for this series: pre-arcing time-current curve, i²t correction vs operating voltage, maximum arc voltage vs circuit voltage, watt loss correction vs percent rated current, correction factor vs air flow speed, dimension drawings. This series is on pp.98–100 of the January 2025 DENCO catalog. Access the catalog or ask for the drawing or curve you need.
Technical review
Specifications on this page are quoted from DENCO’s product catalog. Confirm any rating against DENCO engineering before specifying.
Related
- Ultra-Rapid Semiconductor Fuses: the full family
- Semiconductor fuse application notes
- DIN 43620 knife-blade semiconductor fuses (aR/gR)
- DIN 43653 German-standard semiconductor fuses
- American Standard (BS 88) NH semiconductor fuses
- Press-pack semiconductor fuses
- French standard semiconductor fuses
- Ferrule semiconductor protection fuses
- All fuse product families
- Cross-reference and discontinued replacement
Request a quote for Form 101 cylindrical semiconductor fuses