Allen-Bradley 1321-3R160-B Line Reactor (3R160B)
The Allen-Bradley 1321-3R160-B is a three-phase line reactor designed to limit harmonic distortion, reduce transient overvoltages, and improve power factor in AC drive systems. It is commonly placed between the power source and variable frequency drives or PLC power supplies to protect sensitive electronics from line disturbances.
Electrical Specifications
Inductance: 3.0 mH per phase (at rated current). Rated current: 160 A continuous. Voltage rating: 600 VAC maximum. Impedance: typically 5% at 60 Hz. The reactor is designed for 50/60 Hz operation and has a linearity up to 2x rated current.
Construction and Thermal Performance
The core is made of high-grade silicon steel laminations with an air gap to prevent saturation. Copper windings are insulated with Class F (155°C) or Class H (180°C) material. The reactor includes a built-in thermal switch (normally closed) that opens at 130°C to protect against overtemperature.
Terminals and Wiring
Connection terminals are heavy-duty lug-style, accepting cable up to 4 AWG. The enclosure is NEMA 1 (IP20) for indoor use, with ventilated design. Mounting holes are provided for floor or panel installation.
Harmonic Mitigation
This reactor effectively reduces current harmonics (especially 5th, 7th, 11th) to comply with IEEE 519 guidelines. It also limits inrush current during power-up, extending the life of drive bus capacitors.
Applications
Typical applications include front-end filtering for PWM drives, UPS systems, and PLC power conditioning. It is often used in motor control centers, conveyor systems, and HVAC equipment.
Installation Guidelines
Mount the reactor in a well-ventilated area, maintaining clearance for air circulation. Connect the line side to the power source and the load side to the drive. Ensure proper grounding of the enclosure. A fuse or circuit breaker should be installed upstream.
Environmental Data
Operating temperature: -10°C to +40°C (derating above 40°C). Storage: -25°C to +85°C. Humidity: 0-95% non-condensing. Altitude: up to 1000 m without derating.
Maintenance
Periodic inspection for dust accumulation and terminal tightness. The thermal switch should be tested for continuity.
Compliance
UL 508, CSA, and CE marked. Complies with RoHS directives.
In summary, the Allen-Bradley 1321-3R160-B line reactor provides effective harmonic filtering and surge protection, enhancing the reliability of PLC and drive systems in industrial power networks.
