cooper bussmann

FWX 250V(UL) 1-50A Ferrule High speed fuses

FWX (14 x 51mm)
Description: Ferrule style high speed fuses.
Volts: 250Vac/dc
Amps: 1-50A
IR: 200kA RMS Sym. 50kA@ 250Vdc
Agency Information: CE, UL Recognition 1-50A & CSA
Component Acceptance: 5-30A

Electrical Characteristics
Total Clearing I2t

The total clearing I2t at rated voltage and at power factor of 15% are given in the electrical characteristics. For other voltages, the clearing I2t is found by multiplying by correction factor, K, given as a function of applied working voltage, Eg, (rms).

Dimensions - mm (inches)

Arc Voltage

This curve gives the peak arc voltage, UL, which may appear across the fuse during its operation as a function of the applied working voltage, Eg, (rms) at a power factor
of 15%.

Power Losses

Watts loss at rated current is given in the electrical characteristics. The curve allows the calculation of the power losses at load currents lower than the rated current. The correction factor, Kp, is given as a function of the RMS load current, Ib, in % of the rated current.

Catalog Numbers
Catalog Numbers Rated Current RMS-Amps I2t(A2 Sec) Watts Loss
Pre-arc Clearingat 150V
FWX-1A14F 1      
FWX-2A14F 2      
FWX-3A14F 3      
FWX-4A14F 4      
FWX-5A14F 5 1.6 13 1.3
FWX-10A14F 10 3.6 24 3.4
FWX-15A14F 15 14 83 3.8
FWX-20A14F 20 33 200 4.6
FWX-25A14F 25 58 300 5.3
FWX-30A14F 30 100 500 5.9
FWX-50A14F 50 200 1800 5.7

• Watts loss provided at rated current.
• (250Vdc/Interrupting rating 50kA) UL Recognition & CSA Component Acceptance on 5 through 30A only. Consult Cooper Bussmann for additional ratings.

Features and Benefits
• Excellent cycling capability and DC performance
• Low arc voltage and low energy let-through (I2t)
• Low watts loss in a compact size
• Used with finger-safe holders/blocks

Typical Applications
• DC common bus
• DC drives
• Power converters/rectifiers
• Reduced voltage starters

Time-Current Curve

Peak Let-Through Curve
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