Siemens Switch 3LD2164-0TB51

Core Features 3-Phase Protection for Medium-Power Industrial Circuits: Functions as a 3-pole molded case circuit breaker (MCCB) designed to safeguard medium-power 3-phase systems (e.g., 3-phase motor feeders, process machinery, or branch distribution lines) from overload, overcurrent, and short-circuit hazards. It combines manual power switching with automatic fault tripping—disconnecting power in milliseconds to prevent equipment damage, electrical arcs, or fire risks, making it a staple for light industrial and commercial applications like manufacturing workcells or facility power distribution. Balanced Electrical Ratings: 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). This capacity safely handles medium-load 3-phase equipment (e.g., 30kW motors, 40kW industrial heater banks, or multi-machine assembly lines) while providing robust fault protection—critical for shielding sensitive devices like variable frequency drives (VFDs) or programmable logic controllers (PLCs) from voltage spikes or short-circuit damage. Thermal-Magnetic Protection with Load Adaptability: Features dual, precision-engineered protection mechanisms tailored to industrial load behavior: Thermal overload protection: Adjustable (50–100% of Iₙ) via a bimetallic element. It responds gradually to slow-burning overloads (e.g., motor inrush currents, clogged conveyors) to avoid unnecessary shutdowns, while ensuring sustained overcurrent (a common cause of motor burnout) triggers a safe trip. Magnetic short-circuit protection: Fixed (10x Iₙ) via a magnetic coil. It trips instantaneously (<100ms) during high-current faults (e.g., wire insulation failure, phase-to-ground shorts) to minimize arc exposure and limit damage to connected equipment. Safety & Operational Enhancements: Manual Toggle & LOTO Compliance: A large, ergonomic toggle handle provides clear visual status (up = “On,” down = “Off,” mid = “Tripped”) and includes a built-in lockout hole. This accepts a padlock (OSHA 1910.147 compliant) for lockout/tagout (LOTO) during maintenance, preventing accidental energization and protecting technicians. Trip Indication: The distinct mid-position “tripped” state eliminates ambiguity between manual shutdown and fault-induced tripping—simplifying troubleshooting (e.g., quickly identifying if a shutdown stemmed from operator action or an electrical fault). 3-Phase Synchronized Tripping: Ensures all three phases (L1/L2/L3) disconnect simultaneously during faults. This eliminates phase imbalance or partial energization, which can damage 3-phase equipment (e.g., motors, transformers) by causing uneven current distribution. Robust & Space-Saving Construction: Housed in a flame-retardant thermoset plastic case (UL94 V-0 rated) that resists impact, chemicals (oils, coolants), and temperature fluctuations (-25°C to +60°C). The case’s slim profile (width ~85mm) maximizes space in control cabinets or motor control centers (MCCs). Internal silver-alloy contacts minimize electrical resistance and arcing, ensuring long-term reliability (≥10,000 mechanical operations) even in frequent-switching scenarios. Global Compliance for Versatile Use: Meets international safety and performance standards including IEC 60898-1 (low-voltage circuit breakers), UL 489 (MCCB safety for North America), and CSA C22.2 No. 5 (Canadian electrical safety). It fits standard 35mm DIN rails or panel mounts, integrating seamlessly with Siemens SIVACON® low-voltage switchgear or third-party enclosures—complying with global electrical codes (e.g., NEC in North America, IEC 60364 in Europe). Typical Applications The Siemens Switch 3LD2164-0TB51 is engineered for medium-power 3-phase circuit protection in industrial and commercial settings, with core use cases including: 3-Phase Motor Protection: Installed in motor control centers (MCCs) to protect medium-sized 3-phase motors (e.g., 30kW water pumps, 25kW conveyor drives, or 20kW air compressors) in manufacturing plants, wastewater facilities, or warehouses. The adjustable thermal setting matches the motor’s full-load current, avoiding tripping from normal inrush currents while protecting against overloads. Process Machinery Power Distribution: Used as a main branch breaker for 3-phase process machinery (e.g., injection molding machines, packaging lines, or metal fabrication tools). It isolates faults in individual machines, preventing the entire production line from shutting down due to a single-component issue. Industrial Heater Bank Protection: Safeguards 3-phase industrial heater systems (e.g., 40kW process heaters for plastic molding, 35kW drying ovens for food processing) from overcurrent caused by heater element failure or thermostat malfunctions. The high short-circuit breaking capacity ensures safety during severe faults (e.g., heater wire shorting to ground). Commercial Building HVAC Systems: Deployed to protect 3-phase HVAC equipment (e.g., 25kW rooftop units, 30kW chillers) in large commercial buildings (malls, offices, or hospitals). The compact design fits in HVAC control panels, while the thermal-magnetic protection adapts to variable load demands (e.g., peak cooling periods). Test Bench & Laboratory Setups: Ideal for 3-phase test benches (e.g., motor performance testing, industrial equipment prototyping) where precise current control and fault protection are needed. The adjustable thermal setting allows customization for different test loads, while the LOTO feature ensures technician safety during setup changes.