Siemens Sitor cylindrical fuse link, 20A, 700VDC, 14 x 51mm

Product Overview

The Siemens 3NC1420 is a high-performance SITOR cylindrical fuse link designed specifically for semiconductor protection applications. This 20A rated fuse provides exceptional protection for AC circuits up to 690V and DC circuits up to 700V (DC according to UL), featuring an aR operating class for full-range semiconductor protection. This ultra-fast acting fuse in 14x51mm format is engineered to protect sensitive power semiconductors and electronic components in demanding industrial applications.

Key Features:

• Rated current: 20A with aR operating class for semiconductor protection
• Enhanced voltage ratings: 690V AC / 700V DC (DC according to UL)
• Compact 14 x 51mm cylindrical design for versatile installations
• Ultra-fast acting switch-off characteristics compared to conventional LV HRC fuses
• SITOR technology specifically designed for power semiconductor protection
• UL approved for global applications with enhanced DC voltage capability
• Breaking capacity: 100kA for superior protection performance

Applications:

Specifically designed for protecting high-quality devices and electronic components including semiconductor contactors, electronic relays (solid state), frequency converters with fuses in input and DC intermediate circuits, UPS systems, and soft-starters for motors up to 100A. Essential for applications requiring reliable protection of power semiconductors from short-circuit effects in industrial automation and power electronics systems.

Technical Advantages:

• Extremely fast-acting switch-off characteristic provides superior semiconductor protection
• Power semiconductors are reliably protected even during short-circuit conditions
• Siemens quality standard ensures excellent characteristic curve accuracy
• Global approvals (IEC, UL, CCC) enable worldwide application
• Compatible with LV HRC fuse bases, fuse switch disconnectors, and switch disconnectors with fuses
• Effective protection for personnel, equipment, and systems through reliable shutdown
• Superior performance in frequency converter and UPS system applications

SENTRON System Integration:

As an important element of the SENTRON protective component line for electronic installations, the SITOR fuse system from Siemens provides effective protection for personnel, equipment and plants with reliable shutdown in the event of an overload or short circuit. The system offers comprehensive protection solutions for modern industrial and commercial electrical installations.

Standards Compliance:

Approved according to IEC and UL standards with CCC certification for global use. Part of the SENTRON protective component line ensuring compliance with international safety and performance standards for semiconductor protection applications. Operating class aR (full-range semiconductor protection) provides specialized protection characteristics.

Installation Features:

• Standard 14 x 51mm fuse size offers broad compatibility with existing installations
• Lightweight design minimizes strain on assembly and mounting systems
• Suitable for installation in LV HRC fuse bases and switch disconnectors
• aR utilization category provides very fast disconnection characteristics
• Quick response time for electrical overload and short-circuit protection

Size Comparison: The 14 x 51mm format provides increased current capacity compared to the 10 x 38mm series while maintaining compact dimensions suitable for space-constrained installations. This size is ideal for medium-power semiconductor protection applications.

Physical Specifications:

• Net weight: 0.021 kg
• Fuse dimensions: 14 x 51mm (0.55" x 2.0")
• Packaging dimensions: 15 x 50 x 15 mm
• Country of origin: India
• EAN: 4011209570030
• UPC: 662643083606

Environmental Compliance:

RoHS compliant since July 1, 2006. WEEE (2012/19/EU) take-back obligation applies. Contains lead as disclosed under REACH Article 33 requirements. Manufactured to order classification - products cannot be reused or returned against credit.

Shipping Details:

• Minimum order quantity: 10 pieces
• Product lifecycle: PM300 Active Product

Download existing graphical data for this product:

• Official Siemens Datasheet (PDF)
• Official Siemens Product Page
• Siemens Technical Support Portal
• Siemens SENTRON Product Family
• Siemens Download Center