Mersen, formerly Ferraz Shawmut US14 Data Sheet
UltraSafe™ US14
Fuse Holders, Fuse Bases and Supports / DS-PACYUS14-07-0516_EN
MERSEN reserves the right to change, update or correct, without notice, any information contained in this datasheet.
Modular fuse-holders
PRODUCT RANGE
UltraSafe™ fuse holders for 14x51 fuse links, without indicator
US143
US141I
US142M2
Catalog
number
Reference
number
Number of poles/
phases
Design Weight Package
US141 Z331153 1 US14 single pole 0.143 kg 6
US141N D331157 1 + N US14 single pole + neutral conductor 0.2966 kg 3
US142 G331137 2 US14 double pole 0.2833 kg 3
US143 N331143 3 US14 triple pole 0.43 kg 2
US143N X331151 3 + N US14 triple pole + neutral conductor 0.6 kg 1
UltraSafe™ fuse holders for 14x51 fuse links, with indicator
Catalog
number
US141I A331154 1 US14 single pole 0.1433 kg 6
US142I H331138 2 US14 double pole 0.3 kg 3
US143I P331144 3 US14 triple pole 0.435 kg 2
US143NI R227922 3 + N US14 triple pole + neutral conductor - 1
Reference
number
Number of poles/
phases
Design Weight Package
UltraSafe™ fuse holders for 14x51 fuse-links, with auxiliary microswitch
Catalog
number
US141M B331155 1 US14 single pole, 1 microswitch 0.1525 kg 6
US142M J331139 2 US14 double pole, 2 microswitches 0.3076 kg 3
US142M2 L331141 2 US14 double pole, 2 connected microswitches 0.3076 kg 3
US143M Q331145 3 US14 triple pole 0.4475 kg 2
US143M2 T331148 3 US14 triple pole, 2 connected microswitches 0.4525 kg 2
US143NM Y331152 3 + N US14 triple pole + neutral conductor, 3 microswitches 0.623 kg 1
Reference
number
Number of
poles/phases
Design Weight Package
US143MI
UltraSafe™ fuse holders for 14x51 fuse-links, with indicator and auxiliary microswitch
Catalog
number
US141MI C331156 1 US14 single pole 0.1533 kg 6
US142MI K331140 2 US14 double pole 0.31 kg 3
US142M2I M331142 2 US14 double pole 0.2833 kg 3
US143MI S331147 3 US14 triple pole 0.455 kg 2
US143M2I W331150 3 US14 triple pole 0.455 kg 2
Reference
number
Number of poles/
phases
Design Weight Package
2
UltraSafe™ US14
Fuse Holders, Fuse Bases and Supports / DS-PACYUS14-07-0516_EN
MERSEN reserves the right to change, update or correct, without notice, any information contained in this datasheet.
Modular fuse-holders
TECHNICAL DATA
US14 US14I US14M US14MI
Size 14x51mm 14x51 14x51 14x51
Number of poles/phases 1, 1+N, 2, 3, 3+N, 4 1, 1+N, 2, 3, 3+N, 4 1, 1+N, 2, 3, 3+N, 4 1, 1+N, 2, 3, 3+N, 4
UL ratings AC 800VAC, 50A, 50kA 800 VAC, 50 A, 50 kA 800 VAC, 50 A, 50 kA 800 VAC, 50 A, 50 kA
UL ratings DC 1000VDC, 50A, 50kA 1000 VDC, 50 A, 50 kA 1000 VDC, 50 A, 50 kA 1000 VDC, 50 A, 50 kA
Conventional free air thermal current
with fuse links I
Power dissipation at I
Utilisation category AC20B/DC20B AC20B/DC20B AC20B/DC20B AC20B/DC20B
Rated insulation voltage U
SCCR 100 kA 100 kA 100 kA 100 kA
Rated impulse withstand voltage
U
imp
Degree of protection IP 20 IP 20 IP 20 IP 20
Voltage limit for blown fuse indicator - 230 to 690V AC/DC - 230 to 690V AC/DC
Indication System - with indicator with auxiliary microswitch
Connection
Operating temperature -25°C to 60°C -25°C to 60°C -25°C to 60°C -25°C to 60°C
Storage temperature -25°C to 80°C -25°C to 80°C -25°C to 80°C -25°C to 80°C
th
5 W 5 W 5 W 5 W
th
i
50 A 50 A 50 A 50 A
690 V 690 V 690 V 690 V
8 kV 8 kV 8 kV 8 kV
with indicator and auxiliary
microswitch
Max. tightening torque:
3.5Nm (30lbs-in)
rigid wire = 1.5-35mm²
(16-3AWG)
multistrand wire = 25mm²
(4AWG)
PZ2 or at 5.5x1mm screw
drivers recommended
(max. diameter 6mm)
Max. tightening torque:
3.5Nm (30lbs-in)
rigid wire = 1.5-35mm²
(16-3AWG)
multistrand wire = 25mm²
(4AWG)
PZ2 or at 5.5x1mm screw
drivers recommended
(max. diameter 6mm)
Max. tightening torque:
3.5Nm (30lbs-in)
rigid wire = 1.5-35mm²
(16-3AWG)
multistrand wire = 25mm²
(4AWG)
PZ2 or at 5.5x1mm screw
drivers recommended
(max. diameter 6mm)
Max. tightening torque:
3.5Nm (30lbs-in)
rigid wire = 1.5-35mm²
(16-3AWG)
multistrand wire = 25mm²
(4AWG)
PZ2 or at 5.5x1mm screw
drivers recommended
(max. diameter 6mm)
SPECIFIC USAGE CONDITIONS
Ambient temperature >20°C 30°C 40°C 50°C 60°C
Derating factor (I
No of poles (side by side) 1 to 3 4 to 6 >/= 7
Derating factor of current (I
Nominal current of fuse-link gR 25 A 32 A 40 A 50 A 63 A
Max. operational current in fuse-holder 23 A 28 A 34 A 40 A 46 A
Cable wire section 4 mm² 6 mm² 10 mm² 10 mm² 16 mm²
) 1 0.95 0.9 0.8 0.7
e
) 1 0.95 0.9
th
3
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