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Miniature and residual circuit breakers
Miniature and Residual Circuit Breakers – Technical Overview
Miniature circuit breakers (MCBs) and residual current devices (RCDs) are fundamental components for overcurrent and earth fault protection in low-voltage electrical installations. Lovato Electric offers a comprehensive range of these devices, including MCBs rated up to 125A, combined s...
Miniature and Residual Circuit Breakers – Technical Overview
Miniature circuit breakers (MCBs) and residual current devices (RCDs) are fundamental components for overcurrent and earth fault protection in low-voltage electrical installations. Lovato Electric offers a comprehensive range of these devices, including MCBs rated up to 125A, combined switch-disconnectors, and residual current circuit breakers (RCCBs). All units feature a high breaking capacity of up to 10kA, ensuring reliable fault interruption. The MCBs are available with tripping curves B, C, and D, allowing precise coordination with various load types—from resistive to highly inductive circuits. Many models carry UL approval, making them suitable for North American installations. Key technical parameters include rated voltage up to 400V AC, number of poles (1P, 2P, 3P, 4P), and rated residual operating currents (IΔn) for RCDs, typically 30mA, 100mA, or 300mA for personnel and fire protection.
Applications and Sectors
These circuit breakers are deployed in residential, commercial, and industrial distribution boards, as well as in motor control centers and automation panels. They are ideal for protecting lighting circuits, socket outlets, HVAC equipment, and small machinery. In industrial environments, they serve as backup protection for contactors and motor starters, ensuring compliance with IEC 60947-2 and IEC 61008 standards. Their compact design facilitates installation in modular enclosures, while the high breaking capacity suits systems with high prospective short-circuit currents.
Subcategories and Key Articles
The main subcategories include: miniature circuit breakers (MCBs) like the LO320 series, residual current circuit breakers (RCCBs) such as the LO330 series, and combined RCBOs (residual current breakers with overcurrent protection) like the LO340 series. Article codes typically follow a pattern: e.g., LO320-1P-B16 for a single-pole, 16A, curve B MCB, or LO330-2P-30mA for a two-pole, 30mA RCCB. Other variants include LO320-3P-C32 and LO330-4P-300mA. These codes encode the number of poles, rated current, tripping curve, and residual sensitivity.
Business Benefits and Support
Electric Automation Network provides express worldwide shipping and personalized technical support from specialized engineers. We offer real-time pricing, detailed technical documentation for each article, and multilingual assistance. Our inventory ensures fast delivery for urgent projects, while our engineering team helps select the right devices for your specific application, ensuring compliance and optimal protection.
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