Core Features 3-Pole Molded Case Circuit Breaker for Power Distribution: Functions as a 3-pole molded case circuit breaker (MCCB) designed to protect 3-phase electrical systems from overcurrent, short circuits, and overloads in medium-duty industrial environments. It integrates switching and protection capabilities, making it suitable for feeder circuits, motor control centers, and distribution panels in manufacturing facilities, commercial buildings, and industrial workshops. Balanced Current Rating with Reliable Protection: Rated for 40A continuous current and AC 690V (maximum), with a breaking capacity of 15kA at 415V—capable of safely interrupting fault currents in medium-power networks. It features thermal-magnetic tripping (inverse time-delay for overloads, instantaneous for short circuits) to match the characteristics of 3-phase motors, transformers, and auxiliary equipment, preventing damage during electrical faults. Robust Construction for Industrial Durability: Housed in a flame-retardant thermoset plastic enclosure (UL94 V-0 rating) that resists heat, impact, and chemical exposure. The internal components (copper bus bars, silver-plated contacts) ensure low resistance and high conductivity, minimizing energy loss and maintaining stable performance under continuous full-load operation. The breaker’s compact design allows easy integration into standard switchgear assemblies. Manual Operation with Safety Enhancements: Equipped with a rotary handle for manual ON/OFF control, featuring clear visual indicators (red for OFF, green for ON) to confirm the breaker’s status at a glance. The handle includes a lockable mechanism that accepts padlocks (5mm shackle diameter) in both positions, supporting Lockout-Tagout (LOTO) procedures during maintenance to prevent accidental energization. Flexible Mounting & Wiring Options: Designed for panel mounting in switchgear or distribution enclosures, with compatibility for standard DIN rails (EN 50022) for simplified installation. The line and load terminals use bolted connections, accepting 6–25mm² copper conductors (or aluminum with adapters) to accommodate common industrial cable sizes. Internal arc chutes suppress arcing during switching, extending contact life and enhancing operational safety. Global Safety & Compliance: Meets IEC 60898-1, EN 60947-2, and UL 489 standards, ensuring compliance with international electrical codes for overcurrent protection devices. It operates reliably in temperatures ranging from -5°C to +70°C (23°F to 158°F) and is rated IP20 (IEC 60529) for finger protection and limited dust resistance, making it suitable for diverse indoor industrial settings. Typical Applications The Siemens Switch 3LD2064-1GP51 is engineered for overcurrent protection in medium-duty 3-phase systems, with core use cases including: Feeder Circuit Protection: Deployed in distribution boards to protect feeder circuits supplying power to lighting, HVAC systems, or auxiliary equipment in industrial facilities, isolating faults to prevent widespread outages. Motor Control Applications: Used to protect 3-phase motors (up to 20kW at 415V) in conveyor systems, pumps, or compressors, where thermal-magnetic tripping prevents motor burnout from sustained overloads. Commercial Building Distribution: Installed in main distribution panels of commercial buildings (e.g., warehouses, shopping centers) to protect 3-phase power circuits supplying heavy equipment or multiple load zones. Machine Tool Power Supply: Integrated into the power supply units of medium-sized machine tools (e.g., drilling machines, grinding equipment) to safeguard internal electrical components from overcurrent damage. Temporary Power Setups: Used in portable distribution units for construction sites or event venues, providing reliable overcurrent protection for temporary 3-phase equipment such as generators or heavy tools.