cooper bussmann

LMMT-British BS 88 240V 400-900A

  
LMMT

Description: BS 88 style stud-mount high speed semiconductor fuses.

Ratings:
Volts: 240Vac/150Vdc
Amps: 400-900A
IR: 200kA RMS Sym.
Agency Information: CE, Designed and tested to: BS 88 Part 4, IEC 269 Part 4, UL Recognized. All fuses above have been tested at 318Vac. Consult Cooper Bussmann or Bolfmax for specific 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).

Dimensions (mm)


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 Type Rated Current RMS-Amps I2t(A2 Sec) Watts Loss
Pre-arc Clearing
at 120V at 240V
400LMMT LMMT 400A 6000 35000 80000 60
500LMMT 500A 14000 80000 170000 64
630LMMT 630A 24000 150000 300000 75
710LMMT 710A 32000 200000 460000 77
800LMMT 800A 52000 300000 600000 82
900LMMT 900A 75000 400000 800000 97
• Watts loss provided at rated current.

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

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

Time-Current Curve


Peak Let-Through Curve
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