Scope of Application
• DZ47LEK-125 Residual Current operated Circuit-Breakers (hereinafter referred to as RCBOs) are suitable for AC 50Hz circuits with rated voltages up to 400V and rated currents up to 125A. They rapidly cut off power during electric shocks or grid leakage exceeding thresholds, protecting personnel and equipment. Additionally, they safeguard circuits/motors against overloads/short-circuits and allow infrequent circuit switching or motor starts.
• Complies with
GB/T 14048.2
"Low-voltage switchgear and controlgear – Part 2: Circuit-breakers".
Operating Conditions
• Ambient temperature: -5℃ to +40℃; 24-hour average ≤ +35℃
• Altitude: ≤2,000m
• Relative humidity:
• ≤50% at +40℃; higher humidity permitted at lower temperatures
• Maximum monthly average relative humidity ≤90% (monthly average temperature ≤ +25℃) with anti-condensation measures
• Pollution degree: Level 2
• Installation category: Classes II and III
• Mounting: TH35-7.5 standard rails
• External magnetic fields: ≤5 times Earth's magnetic field
• Orientation: Vertical installation with ≤5° tilt tolerance (handle upward for ON position)
•
Environment: No significant shock/vibration
Structure and Operating Principle
• RCBOs are current-operated electronic type devices combining circuit-breakers with residual current releases. When leakage current IΔn reaches the preset threshold, they instantly trip to cut power, providing leakage/shock protection while simultaneously safeguarding against circuit overloads and short circuits.