DRC

DRC - Motor Protection Circuit Breakers (MPCBs) and Manual Motor Starters

Motor Protection Circuit Breakers, commonly referred to as DRCs or Manual Motor Starters (MMS), are compact electromechanical devices designed to provide thermal and magnetic protection for electric motors against overloads and short circuits. These units typically feature adjustable thermal overload settings (e.g., 0.1-100A ranges), magnetic short-circuit release, and manual ON/OFF control. They are available in various frame sizes with different breaking capacities (up to 100kA at 400V AC) and number of poles (3P or 4P). Many models include integrated auxiliary contacts, shunt trips, and undervoltage releases for remote signaling and control. The DRC combines the functions of a circuit breaker and a contactor in a single device, offering a compact solution for motor branch circuits.

These devices are primarily installed in motor control centers (MCCs), distribution boards, and industrial control panels. They are essential in sectors such as manufacturing, water treatment, HVAC, conveyor systems, and pump stations. DRCs are used for direct-on-line starting of three-phase induction motors, ensuring protection against phase failure, overload, and short circuits. They are also common in automated production lines, compressors, and machine tools where reliable motor protection and manual reset are required.

The main subcategories within DRC include fixed and adjustable thermal overload types, with standard current ratings like 0.1-0.4A, 0.4-0.63A, 0.63-1A, 1-1.6A, 1.6-2.5A, 2.5-4A, 4-6.3A, 6.3-10A, 10-16A, 16-25A, 25-40A, 40-63A, and 63-100A. Common article codes follow patterns such as DRC-xxx (e.g., DRC-10, DRC-25) or specific manufacturer codes like MS132, MS116, or PKZM0. These codes often indicate the frame size and current range. Key accessories include auxiliary contact blocks (e.g., DRC-AX), shunt trips (DRC-ST), and undervoltage releases (DRC-UV).

At Electric Automation Network, we offer DRCs at competitive prices with up to 65% discount compared to market rates. Our stock includes genuine brands with fast express shipping worldwide. Each product comes with detailed technical documentation and datasheets. Our team of specialized engineers provides personalized technical support to help you select the right DRC for your motor protection application, ensuring compliance with IEC 60947-4-1 standards.