Scope
• HELLE series Residual Current operated Circuit-Breakers are suitable for AC 50Hz circuits with rated voltages up to 400V, rated currents up to 63A, and grounded neutral points. They provide protection against electric shock, overcurrent for building circuits/equipment, and fire hazards caused by ground fault currents from insulation failures.
• Specialized Models: 1P+N and 2P configurations can be custom-produced with overvoltage protection. Beyond standard overload/short-circuit/leakage protection, these safeguard against voltage surges (e.g., from neutral line miswiring, disconnection, or three-phase imbalance).
• Complies with
GB/T 16917.1
"Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) – Part 1: General rules".
Structure and Operating Principle
• HELLE series RCBOs are current-operated electronic type devices combining MCBs 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.
Operating and Installation Conditions
• Ambient temperature: -5℃ to +40℃
• 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: II, III
• Mounting: TH35-7.5 standard rails
• External magnetic fields: ≤5 times Earth's magnetic field
• Orientation: Vertical installation (handle upward for ON position)
• Environment: No significant shock/vibration