Eaton Bussmann European Square Body Fuses (Series 170…)

High-Speed Semiconductor Fuses for Demanding Industrial Power Applications

Eaton Bussmann Series 170… European Square Body Fuses are advanced, high-performance fuses specifically engineered to protect sensitive semiconductors and power electronic systems. These fuses offer exceptional current-limiting capability, fast-acting protection, and reliable operation under high thermal and electrical stress. Designed according to IEC 60269-4 and DIN 43653 standards, they are ideal for use in industrial drives, UPS systems, DC networks, inverters, and battery energy storage systems.

⚙️ Technical Overview

• Voltage Ratings (Un):

  • 400 V / 500 V / 690 V AC

  • 700 V / 750 V / 1000 V / 1250 V DC (depending on type)

• Current Ratings (In):

  • From 10 A to 1400 A

• Breaking Capacity (Iₙ):

  • Up to 200 kA AC

  • Up to 150 kA DC (depending on configuration)

• Time-Current Characteristics:

  • aR class (partial-range, extremely fast)

  • gR class (full-range semiconductor protection)

  • Optional aM class (for motor protection – available on request)

• Typical Pre-arcing I²t:

  • From 1 A²s to over 300,000 A²s, depending on fuse size and rating

• Construction:

  • Ceramic body, filled with arc-quenching silica

  • Silver-plated contacts for optimal conductivity and heat dissipation

  • Striker pin and visual indicator options available

  • Available in multiple contact styles:

    • Flush-end (DIN 43 653)

    • Center-blade

    • Offset-blade

    • Bolted or clip-in terminals

🔧 Mechanical Dimensions

• Standard body sizes:

  • 80 x 25 mm to 150 x 80 mm, depending on amperage

  • Typical mounting hole distances: 63 mm / 80 mm / 100 mm / 110 mm

  • Contact bolt sizes: M6 / M8 / M10

• Weight:

  • Ranges from 150 g to 2.5 kg per fuse

• Striker Pin Force (where applicable):

  • Typically 1.2 to 2 N, for microswitch triggering

🏭 Key Applications

• Industrial drives and soft starters

• Semiconductor rectifiers (thyristors, diodes, IGBTs)

• UPS and backup power systems

• DC grids and inverters

• Battery energy storage systems (BESS)

• Railway and traction systems

• Photovoltaic inverters and hybrid systems

• Wind turbines and pitch control systems

🔍 Example Eaton Bussmann 170 Series Part Numbers

• 170M1410 – 690 V aR fuse, 125 A, flush-end, no striker

• 170M1378 – 690 V aR fuse, 100 A, flush-end, with striker pin

• 170M1569 – 690 V aR, 350 A, center-blade, indicator window

• 170M6618 – 1000 V DC aR, 400 A, high-voltage, striker included

• 170M7321 – 1250 V DC, 315 A, for EV battery & storage applications

✅ Benefits of Eaton Bussmann Square Body Fuses

• Extremely fast interruption of short-circuits

• Low let-through energy to protect sensitive semiconductor devices

• Compact square-body design for high current density

• Long mechanical life and thermal cycling resistance

• Fully compliant with IEC, UL Recognized options available

• Available with microswitch-compatible striker pins for remote fuse monitoring

🔧 Accessories and Compatible Holders

• Bussmann fuse blocks and fuse clips for DIN-style mounting

• Microswitches for remote fuse indication

• Heat sink adapters and insulated covers available

• Custom mounting solutions for multi-fuse arrays on request

📦 Logistics & Availability

• High availability for popular sizes

• Special high-speed types for unique applications available on request

• Datasheets, 2D drawings, and CAD files available

• Expert support for selection, cross-referencing, and retrofitting

Protect your high-value semiconductor systems with the proven reliability of Eaton Bussmann 170 Series Square Body Fuses. These components are engineered for maximum protection, durability, and integration flexibility in high-performance electrical environments.