Eaton Bussmann 170M Series High-Speed Fuses (aR/gR)

Following Eaton's strategic consolidation of the legacy Cooper Bussmann brand, the Eaton Bussmann 170M Series High-Speed Fuses continue to deliver the identical form, fit, and world-class functionality expected by OEM electrical cabinet builders and facilities managers. Designed specifically for advanced semiconductor protection, this extensive square-body, DIN-style series minimizes let-through energy to safeguard critical power electronics.

Product Overview

The 170M series encompasses an exceptionally broad range of operating currents (10A to 1600A) housed in standard DIN 43620 blade sizes (000, 00, 1, 2, and 3). Engineered for extremely rapid clearing action, these fuses utilize specialized element designs to yield dramatically low l²t (let-through energy) metrics and minimal arc voltages. Available in both aR (partial range short-circuit protection) and gR (full range overload and short-circuit protection) classes, they ensure absolute reliability and safety under severe electrical fault conditions.

Typical Applications

• Protection of high-efficiency Variable Frequency Drives (VFDs) and heavy-duty motor soft starters.
• DC common bus rectifiers, inverters, and sophisticated Uninterruptible Power Supplies (UPS).
• Safeguarding discrete power semiconductors such as IGBTs, GTOs, and high-power thyristors.
• Heavy industrial control panels needing modular DIN rail integration.

Key Features & Benefits

• Extremely Low Let-Through (I²t): Significantly limits the thermal and mechanical stress on sensitive semiconductor components during a fault.
• Reduced Power Dissipation: Low watts loss architecture protects adjacent electronics from supplementary thermal loading, easing cabinet HVAC requirements.
• Adaptable Indication (-BI / -BIM Suffixes): Catalog numbers containing -BI or -BIM feature factory-equipped microswitch actuators for precise, remote fuse-blown telemetry via SCADA systems or local cabinet PLC integration.
• Universal Form Factor: DIN 43620 blade styles (sizes 000 through 3) fit global standard mounting bases and disconnecting switches.

Product Range & Selection Guide

Available Accessories

• Microswitch Indicators: Compatible exclusively with fuses featuring the -BI (Type T base) and -BIM (Type K base) catalog permutations. Converts the visual pin trip into a remote electrical signal.
• Fusible Disconnect Bases: Dedicated multi-pole DIN 43620 isolation bases configured to support sizes 000 up to size 3.