Ferraz Shawmut US143I 14 x 51 mm 3-Pole 50 Amp 750 Volt Fuse Holder
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Manufacturer Mersen
Mfg Catalog # US143I
Crawford Part # 114366


  • Flame retardant materials with glow wire flammability index to 960°C
  • DIN rail mounting
  • Sealable in closed and open position
  • Multi-pole assembly kit available
  • Plastic material UL94V2 mini
  • Lockable
  • Finger safe
  • Degree of protection: IP20
  • Modular design
  • Optional visual blown fuse indicator & microswitch

Product Details

  • AC Voltage: 750 VAC
  • Wiring Range: #2 to #14 Solid/Stranded Cu Wire
  • DC Voltage: 750 VDC
  • Size per Standard: 14x51 14x51mm
  • Ampere: 50 A
  • ROHS Compliant: Yes
  • Applications: All circuits up to 750V for protection of motors, transformers, low voltage distribution, control circuits. Non-load operation.
  • CE conformity: Yes
  • Enclosure: IP20
  • Standards: UL Recognized Component, UL4248, guide IZLT2, file E52283 CSA Certified C22.2, class 6225, file 32169 IEC 60269-2 and IEC 60947-3 RoHS Compliant Plastic material: NF 16101 & 16102 Requirement 2 Compliant
  • Number of Poles: 1 1 + N 1, 2, 3 2 3 3 + N 4 N
  • Lead Free: Consult Technical Services
  • SCCR: 100 kA 100kA 200 kA
  • Mounting: Installation On To DIN Rails To EN 60716

CAD & Outline Drawings

CAD Drawings


Data Sheets


UPC 78200131113
Product Description The innovative and comprehensive UltraSafe range of Mersen fuse-holders. Modular fuse-holders are finger-safe under IEC standards to an IP20 grade of protection, including fuse changing (with the flick of a finger). Modular fuse-holders are available in 1, 2, 3 or 4 poles, with or without visual blown fuse indicator, in UL + IEC version. Multi-pole units can also be field assembled by ordering pin-ties assembly kit. In this size, the range also offers the possibility to use microswitches (supplied with the holders or ordered separately) to allow remote indication. UltraSafe range is made of tough and durable thermoplastic or thermoset material.
MDM Pkg GTiN 00782001311131
Voltage 750 Volt
Family Brand Name Ferraz Shawmut
Amperage 50 Amp
Number of Poles 2-1 Pole

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