cooper bussmann

FM-British BS 88 690V 180-350A

BS 88 style stud-mount fuses.

Volts: 690Vac/500Vdc
Amps: 180-350A
IR: 200kA RMS Sym.

Agency Information:
CE, Designed and tested to: BS 88 Part 4, IEC 269 Part 4, UL Recognized.  Consult Cooper Bussmann for UL Recognition status.

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).

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.

Features and Benefits
• Excellent cycling capability
• Excellent DC performance
• Low arc voltage and low energy let-through (I2t)
• Low watts loss

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

Dimensions (mm)

Catalog Numbers
Catalog Numbers Type Rated Current RMS-Amps I2t(A2 Sec) Watts Loss
Pre-arc Clearing
at 415V at 660V
180FM FM 180A 1400 7500 13500 40
200FM 200A 2600 10500 18500 40
225FM 225A 3700 14500 26500 44
250FM 250A 5200 20500 37500 48
280FM 280A 7000 30500 55000 48
315FM 315A 10000 40000 77000 55
350FM 350A 15000 60000 105000 55
• Watts loss provided at rated current.

Time-Current Curve

Peak Let-Through Curve
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