Overview
The Ferraz Shawmut Mersen USM1I is a modular, single-pole UltraSafe fuseholder rated for 30A at 600V AC/DC. Designed for 1-1/2″ × 13/32″ midget-class fuses, this unit combines compact DIN-rail mounting with fingersafe operation under IEC and DIN standards to IP20 protection. The tough polyamide body and snap-on design make it an ideal choice for electrical distribution panels, control cabinets, and industrial switchgear where space and safety are priorities.
Key Features
- UltraSafe™ Fingersafe Design: Qualifies as “Finger-safe” under IEC and DIN standards to an IP20 grade of protection, including fuse changing with the flick of a finger
- Modular & Compact: Saves up to 15% mounting space and can be snapped onto 35mm DIN-rail for flexible panel layouts
- Visual Indicator: Indicator type provides visual blown fuse detection
- Durable Materials: Tough and durable polyamide body with exceptional insulating properties
- Multiple Poles Available: UltraSafe holders are available in 1, 2, 3 or 4 poles, with or without visual blown fuse indicators
- Industrial Certifications: UL, CSA C22.2, and CE approved
Technical Specifications
- Model: USM1I
- Rated Current: 30 Amperes
- Voltage Rating: 600 VAC / 600 VDC
- Poles: 1 (Single Pole)
- Fuse Type: Midget (1-1/2″ × 13/32″)
- Withstand Rating: 100kA I.R. (Interrupting Rating)
- Wire Gauge: 14 to 6 AWG
- Mounting: 35mm DIN-rail snap-on
- Material: Polyamide (thermoplastic)
- Protection Grade: IP20 (IEC/DIN)
- Operating Temp Range: -25°C to +55°C
- UPC: 782001829971
- Quantity: Lot of 10 units
Typical Applications
- Industrial control panels and distribution switchgear
- Motor starter enclosures and VFD cabinets
- PLC and instrumentation power protection
- Manufacturing equipment with modular control architecture
- Data center and server room UPS branch circuits
- HVAC and building automation control centers
Compatibility & Replacements
Compatible With
- All standard 1-1/2″ × 13/32″ midget-class fuses (Class CC)
- 35mm standard DIN-rail systems
- 600V AC/DC industrial control systems
- Panel-mounted fuse coordination schemes up to 30A
- Mersen pin-tie handle assemblies for multi-pole configurations
Replaces / Drop-In Replacement For
- Earlier Ferraz Shawmut USM single-pole designs
- Standard non-modular 30A midget fuse blocks in retrofit applications
- Note: Verify exact compatibility with legacy systems before ordering
Works With
- Mersen UltraSafe™ Class CC (USCC) and Midget (USM) fuses
- 35mm DIN-rail carrier systems (standard industrial profile)
- Mersen multi-pole assemblies and pin-tie expansion modules
- IEC/DIN-compliant electrical distribution architectures
- UL 508 industrial control panel designs
