Form No.
Page 1 of 2
BIF Doc #720031
Bussmann®
Square Body – Flush End Contact
1250V/1300V (IEC/U.L.) 50-1400A
Electrical Characteristics Ordering Information Curves
Rated -BKN/75 -BKN/80 -BKN/90 -GKN/75 -GKN/90
Current I2t (A2S) Type K Type K Type K Type K Type K
RMS- Clearing Clearing Watts Indicator Indicator Indicator Indicator Indicator
Size Amps Pre-arc at 1000V at 1250V Loss for Micro for Micro for Micro for Micro for Micro BIF #
50 135 815 1100 15 170M3388 170M3438 170M3488
63 215 1300 1750 20 170M3389 170M3439 170M3489
80 420 2500 3350 25 170M3390 170M3440 170M3490
100 750 4450 5950 30 170M3391 170M3441 170M3491
125 1450 9000 11500 35 170M3392 170M3442 170M3492 17056630
1* 160 2600 16000 21000 40 170M3393 170M3443 170M3493
200 5150 31000 41000 45 170M3394 170M3444 170M3494
250 9200 54500 73000 55 170M3395 170M3445 170M3495
315 18500 115000 150000 60 170M3396 170M3446 170M3496
350 27000 165000 220000 65 170M3397 170M3447 170M3497
400 53000 265000 335000 70 170M3448
160 1900 11500 15500 45 170M4388 170M4438 170M4488
200 3800 22500 30000 50 170M4389 170M4439 170M4489
250 7750 46000 61500 60 170M4390 170M4440 170M4490
315 15000 90000 120000 65 170M4391 170M4441 170M4491
1 350 20000 125000 165000 70 170M4392 170M4442 170M4492 17056632
400 29500 175000 235000 75 170M4393 170M4443 170M4493
450 42000 250000 335000 80 170M4394 170M4444 170M4494
500 69500 340000 435000 85 †170M4395 170M4445 †170M4495
550 95000 465000 590000 95 ‡170M4396 170M4446 ‡170M4496
630 130000 660000 100 ‡170M4397 †170M4447 ‡170M4497
250 6500 38500 51500 65 170M5388 170M5438 170M5588
280 9350 55500 74500 70 170M5389 170M5439 170M5589
315 13000 77500 105000 75 170M5390 170M5440 170M5590
350 16500 97500 135000 80 170M5391 170M5441 170M5591
400 23000 140000 180000 85 170M5392 170M5442 170M5592
450 34000 205000 270000 90 170M5393 170M5443 170M5593
2 500 48000 285000 380000 95 170M5394 170M5444 170M5494 170M5594 170M5644
550 62000 370000 495000 100 170M5395 170M5445 170M5495 170M5595 170M5645 17056634
630 115000 575000 730000 110 †170M5396 170M5446 170M5496 †170M5596 170M5646
700 160000 795000 1050000 115 ‡170M5397 †170M5447 170M5497 ‡170M5597 170M5647
800 245000 1200000 1550000 120 ‡170M5398 ‡170M5448 170M5498 ‡170M5598 170M5648
†900 360000 1750000 125 170M5499 170M5649
†1000 480000 2350000 135 170M5500 170M5650
315 9500 58000 77500 85 170M6338 170M6538 170M6588
350 13500 81500 110000 90 170M6339 170M6539 170M6589
400 19500 120000 160000 95 170M6340 170M6540 170M6590
450 31000 185000 245000 100 170M6341 170M6541 170M6591
500 39000 235000 310000 105 170M6342 170M6542 170M6592
550 55000 325000 435000 110 170M6343 170M6543 170M6593
630 83500 495000 665000 115 170M6344 170M6544 170M6494 170M6594 170M6644 17056636
3 700 115000 705000 940000 120 170M6345 170M6545 170M6495 170M6595 170M6645
800 205000 995000 1300000 125 †170M6346 170M6546 ¥170M6496 †170M6596 ¥170M6646
900 305000 1500000 1900000 130 ‡170M6347 †170M6547 ¥170M6497 ‡170M6597 ¥170M6647
1000 450000 2150000 2750000 135 ‡170M6348 †170M6548 ¥170M6498 ‡170M6598 ¥170M6648
1100 575000 2800000 3600000 140 ‡170M6349 ‡170M6549 ¥170M6499 ‡170M6599 ¥170M6649
†1250 810000 3950000 145 170M6500 170M6650
†1400 1250000 6000000 150 170M6501 170M6651
nInterrupting rating 100kA RMS Symmetrical. 1 kg = 2.2 lbs. 1 lb = 0.45 kg
nWatts loss provided at rated current.
nRated voltage (IEC) †1100V ‡1000V ¥1250V (Consult Bussmann for U.L. Recognition/ CSA Component Acceptance status.)
nIndividual Fuse Weight: Size 1* = 0.380 kg
Size 1 = 0.580 kg
Size 2 = 0.900 kg
Size 3 = 1.250 kg
nMicroswitch indicator ordered separately.
®
7-11-01 SB01191
R
Form No.
Page 2 of 2
BIF Doc #720031
Bussmann®
The only controlled copy of this BIF document is the electronic read-only version located on the Bussmann Network Drive. All other copies of this document are by definition uncontrolled.
This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Bussmann reserves the right,
without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Bussmann also reserves the right to change or update, without
notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
Square Body – Flush End Contact
1250V/1300V (IEC/U.L.) 50-1400A
Total Clearing I2t
The total clearing I2t at rated voltage and
at power factor of 15% are given in the
electrical characteristics. For other volt-
ages, the clearing I2t is found by multi-
plying 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 .
Electrical Characteristics
A
B
D
E
EH
G
F
Size Type A B D E F F§GH
1* BKN + GKN/75 74 75 59 45 M8 fiΩ¡§∑ - 18 UNC-2B 5 Ø17
1* BKN/80 80 81 59 45 M8 5 Ø17
1 BKN + GKN/75 74 75 69 53 M8 fiΩ¡§∑ - 18 UNC-2B 8 Ø20
1 BKN/80 80 81 69 53 M8 8 Ø20
2 BKN + GKN/75 74 75 77 61 M10 ‹Ω•∑ - 16 UNC-2B 10 Ø24
2 BKN/80 80 81 77 61 M10 10 Ø24
2 BKN + GKN/90 80 91 77 61 M10 ‹Ω•∑ - 16 UNC-2B 10 Ø24
3 BKN + GKN/75 74 76 92 76 M12 ⁄Ω™∑ - 13 UNC-2B 10 Ø30
3 BKN/80 81 83 92 76 M12 10 Ø30
3 BKN + GKN/90 81 91 92 76 M12 ⁄Ω™∑ - 13 UNC-2B 10 Ø30
§Valid for fuses type -GKN/-
Dimension in mm.
1mm = 0.0394∑ 1∑ = 25.4mm
Dimensions
Flush End Contact: Type -BKN/-, -GKN/-
K
1.5
1.0
1.25
0.5
0.4
0.3
0.2
400 600 800 1000 1200 1400
Eg
UL
3
2.5
8
103
1.4
1.8
6
4
5
3400 600 800 1000 1200 1400
Eg
Kp
30 40 50 60 70 80 90 100%
Ib
1.0
0.8
0.4
0.5
0.6
0.3
0.2
0.1
- - - - - -
Dashed lines apply to the following amperages:
Size 1* 1 2 3
Amp 400 500-630 630-1000 800-1400
®
7-11-01 SB01191
R
¥
