Overview
The Mersen ATQR1 is a small-dimension, Class CC time-delay fuse engineered for circuit protection in electrical distribution systems. Built by Mersen (formerly Ferraz Shawmut), the ATQR1 delivers reliable protection for control transformers, solenoids, and other inductive loads that experience high inrush currents. The fuse’s time-delay characteristic prevents nuisance trips while maintaining superior current-limiting performance for safe, fast fault clearing.
Key Features
- Time-Delay Protection: Prevents false trips on control transformer and solenoid inrush currents without sacrificing response time to genuine faults
- Current-Limiting Design: Reduces peak let-thru current and arc duration for improved circuit protection
- Rejection-Style Construction: Prevents installation errors when used with compatible fuse blocks and holders
- High-Visibility Orange Label: Enables quick identification and simplified replacement in the field
- Fiberglass Body: Offers enhanced stability and durability in demanding industrial environments
- 200 kA Interrupt Rating (AC): Handles high fault current conditions safely and reliably
Technical Specifications
Electrical Ratings
- Voltage Rating: 600 VAC / 300 VDC
- Fuse Type: Class CC, Time-Delay
- Interrupt Capacity: 200 kA AC / 100 kA DC
- Series: Amp-Trap 2000
- Construction: Fiberglass body with ferrule terminals
- Approval: UL and CSA certified
Typical Applications
The ATQR1 fuse is ideal for protecting:
- Control transformer primary and secondary circuits
- Motor control centers and branch circuit distribution
- Solenoid valve and coil circuits in industrial automation
- General lighting and appliance branch circuits
- Equipment requiring protection against both overloads and short circuits
Compatibility & Replacements
Compatible With
- Class CC fuse blocks and holders (with rejection-style design)
- Standard electrical distribution panels and load centers
- Control transformer circuits (240V and 480V primary protection)
- Industrial control systems requiring UL/CSA-rated protection
Replaces / Drop-In Replacement For
- Earlier Ferraz Shawmut ATQR series fuses
- Functionally equivalent to Eaton Cooper Bussmann FNQ-R series for similar applications
Works With
- Standard Class CC fuse holders and clip-style blocks
- Rejection-style fuse bases (prevents installation of incorrect amperage)
- Electrical systems operating at 600V AC or 300V DC
