Core Features 3-Phase Overcurrent & Short-Circuit Protection: Functions as a 3-pole molded case circuit breaker (MCCB) designed to protect 3-phase industrial circuits (e.g., motor feeders, power distribution lines, or heavy machinery) from overcurrent, short-circuit, and overload hazards. It combines manual power switching with automatic fault tripping—disconnecting power within milliseconds if current exceeds safe limits, preventing equipment damage, fires, or electrical shock. High Current Rating & Protection Settings: Rated for AC 415V (50/60Hz) with a rated current (Iₙ) of 63A and a short-circuit breaking capacity (Icu) of 50kA (at 415V AC)—suitable for medium-power 3-phase systems (e.g., 30kW motors, 40kW industrial heater banks). It features adjustable thermal overload protection (to match load characteristics) and fixed magnetic short-circuit protection, ensuring precise, load-specific safety. Robust Molded Case Construction: Housed in a flame-retardant thermoset plastic case (UL94 V-0 rated) that insulates live components and withstands mechanical impact, heat, and chemical exposure. Internal components include bimetallic thermal elements (for overload detection) and magnetic coils (for short-circuit detection), paired with silver-alloy contacts for low resistance, minimal arcing, and long-term durability (≥10,000 mechanical operations). Safety & Operational Enhancements: Manual Reset & Lockout: A toggle handle enables manual switching (“On”/“Off”) and provides visual confirmation of circuit status; a built-in lockout hole allows securing the handle in the “Off” position with a padlock (compliant with OSHA 1910.147 LOTO standards) for safe maintenance. Trip Indication: A visual trip marker on the handle signals if the breaker tripped due to a fault (vs. being manually turned off), simplifying troubleshooting. 3-Phase Synchronized Protection: Ensures all three phases (L1/L2/L3) disconnect simultaneously during a fault, eliminating phase imbalance or partial energization that could damage sensitive 3-phase equipment (e.g., motors, drives). 3-Phase System Compatibility: Optimized for 3-phase AC power systems (common in industrial manufacturing, commercial buildings, and critical infrastructure), it integrates seamlessly into switchgear, motor control centers (MCCs), or power distribution panels. It supports both incoming power feeders and outgoing load circuits, providing end-to-end protection. Global Compliance & Interoperability: Meets international safety and performance standards including IEC 60898-1, UL 489, and CSA C22.2 No. 5, ensuring compliance with global electrical codes (e.g., NEC, IEC 60364). It is compatible with Siemens SIVACON® low-voltage switchgear and standard industrial enclosures, supporting easy retrofitting or new installations. Typical Applications The Siemens Switch 3LD2164-0TB61 is engineered for 3-phase circuit protection in industrial and commercial power systems, with core use cases including: 3-Phase Motor Feeder Protection: Installed in motor control centers (MCCs) to protect 3-phase motors (e.g., 30kW pumps, 25kW compressors, 20kW conveyors) from overloads and short circuits. The adjustable thermal setting matches the motor’s full-load current, preventing unnecessary tripping while ensuring safety. Power Distribution Panel Protection: Used as a main or branch circuit breaker in 3-phase power distribution panels for factories, warehouses, or commercial buildings. It protects downstream circuits (e.g., lighting, auxiliary equipment, or process machinery) from electrical faults. Industrial Machinery Protection: Integrated into the power supply of heavy machinery (e.g., CNC machining centers, stamping presses, or plastic injection molders) to safeguard internal electrical systems (e.g., drives, controllers, or sensors) from overcurrent damage. Critical Infrastructure Circuits: Deployed in water treatment plants, data centers, or healthcare facilities to protect 3-phase critical loads (e.g., water pumps, backup generators, or medical equipment). The high short-circuit breaking capacity ensures reliability during grid faults. Renewable Energy Systems: Used in small-scale 3-phase solar or wind energy systems to protect inverter outputs or battery bank feeders from overcurrent, ensuring safe integration with the grid or off-grid loads.