Description

Fuji Electric Fz4-605 Miniature Circuit Breaker

Technical Specifications

• Product Model: Fz4-605
• Brand: Fuji Electric
• Warranty: One Year
• Input Voltage: AC 230V/400V 50/60Hz
• Operating Temperature: -5°C to +55°C
• Storage Temperature: -40°C to +70°C
• Response Time: ≤0.1s short-circuit tripping delay
• Protection Class: IP20 (DIN rail cabinet mounting)
• Accuracy Class: Class 3 thermal trip calibration
• Output Frequency: 50Hz / 60Hz dual frequency compatible
• Rated Current Range: 5A rated nominal current
• Communication Interface: No built-in digital communication interface
• Supported Protocols: N/A (pure electromechanical protection device)
• Overload Capacity: 1.13× rated current for thermal overload tripping, 10× In instantaneous short-circuit cutoff
• Dimensions: 72mm (L) × 45mm (W) × 78mm (H)
• 

Product Overview

The Fz4-605 is a single-pole miniature circuit breaker developed by Fuji Electric for low-voltage industrial and commercial power distribution systems. This electromechanical protection component integrates thermal overload protection and electromagnetic short-circuit protection into a compact DIN-rail mount housing, designed to safeguard branch control loops, small automation loads, instrumentation power supplies and auxiliary electrical circuits from overheating and destructive short-circuit faults.

It resolves core electrical safety risks in automation cabinets, including continuous overload-induced cable insulation degradation, instantaneous short-circuit surge damage to PLC power modules and sensors, and cascaded fault propagation across adjacent control branches. Constructed with arc-quenching chamber, high-temperature resistant thermoplastic casing and bimetallic trip element, the unit maintains stable tripping performance under cabinet heat accumulation, minor vibration and fluctuating grid voltage conditions.

Electrical panel builders, automation system maintenance engineers, factory facility electricians and OEM control cabinet integrators gain practical operational value from this spare protection component. It supports standard 35mm DIN rail quick installation without wiring modification, delivers consistent trip characteristics compliant with IEC 60898 standards, enables fast fault isolation during equipment troubleshooting, and extends the service life of downstream sensitive industrial automation hardware by cutting off abnormal current in a timely manner.