Unidad de control estándar Schneider LUCA32BL TeSys U

The LUCA32BL is a three-phase motor standard control unit belonging to Schneider Electric‘s TeSys U series. It must be used in combination with LUB series power bases (LUB32/LUB38) to form a complete motor starter, providing comprehensive protection against overload, cortocircuito, pérdida de fase, ground fault and other faults.

Core Product Parameters

Elemento de parámetro	Specification Value	Descripción
Serie de productos	TeSys U	Schneider’s new-generation modular motor control and protection system
Control Type	Standard Control Unit (LUCA)	Basic motor protection, suitable for normal working conditions
Rango de corriente nominal	8-32A	Adjustable, compatible with the rated current of motors
Número de polo	3PAG (Three-phase)	Designed for three-phase asynchronous motor control
Control Circuit Voltage	24En DC	Coil operating voltage, requiring independent external power supply
Tensión de funcionamiento nominal	690V y	Maximum operating voltage of the main circuit
Clase de viaje	Clase 10	Overload trip time: aproximadamente 2 seconds at 10脳In
Compatible Power	15kW@400V / 18.5kW@600V	Maximum power compatibility for three-phase motors
Funciones de protección	Sobrecarga, Cortocircuito, Phase Loss, Phase Imbalance, Ground Fault	Comprehensive motor protection meeting IEC standards
Método de reinicio	Manual Reset	Manual recovery is required after a fault to ensure safety
Método de montaje	Plug-in Type	Quick combination with LUB power bases without tools
Protection Degree	IP20 (Cabinet-mounted)	Prevent accidental contact with live parts by fingers

Detailed Functional Features
Protección contra sobrecarga: Achieves Class 10 trip characteristics through adjustable current setting (8-32A), compatible with motors of different power ratings.
Protección contra cortocircuitos: Features an instantaneous trip function, which cooperates with LUB power bases to quickly cut off the circuit in case of short circuit faults.
Phase Loss/Phase Imbalance Protection: Monitors three-phase currents in real time, and immediately cuts off the circuit when any phase is missing or the current imbalance degree exceeds the set value.
Protección de falla a tierra: Built-in ground fault detection function, with configurable ground fault current threshold to prevent leakage hazards.
Indicación de estado: LED indicators display the running and fault statuses, facilitando el diagnóstico rápido de fallas.
Modular Design: Can be combined with various accessories (such as communication module LUFN) to expand functions.

III. Companion Products and Compatibility

Mandatory Companion Products

Product Model	Product Name	Función	Compatibility Description
LUB32	Power Base	Provides main circuit contacts and mounting interface	Compatible with 8-32A control units, corriente nominal 32A
LUB38	Power Base	Provides main circuit contacts and mounting interface	Compatible with 8-32A control units, rated current 38A
LU2B32BL	Reversing Contactor Circuit Breaker	Designed for reversible motor control	Combined with LUCA32BL to realize forward and reverse rotation control

Optional Expansion Accessories

Accessory Model	Accessory Name	Función	Escenario de aplicación
ASILUFC5/ASILUFC51	Auxiliary Contact Module	Provides additional normally open/normally closed contacts	Control circuit expansion and status feedback
LUFC00	Communication Interface Module	Enables Modbus communication	Remote monitoring and data acquisition
LUFN	Network Communication Module	Supports multiple industrial buses	Industrial automation system integration

Escenarios de aplicación típicos
Motor control and protection for general machinery such as water pumps and fans
Motor protection for continuous operation equipment such as compressors and conveyors
Motor control circuits for small and medium-sized production lines
General industrial environments requiring basic protection functions
Safety circuits or automation systems requiring 24V DC control
Installation and Wiring Key Points
Pasos de instalación
Ensure the power supply is disconnected and confirm that the installation environment meets IP20 requirements.
Align the LUCA32BL control unit with the guide rail of the LUB power base, press vertically downward until a “hacer clic” sound is heard to confirm it is locked in place.
Connect the control circuit: Connect the 24V DC power supply to the +/- terminals of the control unit.
Connect the main circuit: Connect the three-phase power supply to the incoming terminals of the LUB power base, and connect the outgoing terminals to the motor.
Adjust the current setting: Rotate the current adjustment knob on the control unit to the corresponding value according to the rated current of the motor.
Especificaciones de cableado

Circuit Type	Wiring Requirements	Wire Specification
Circuito de control (24En DC)	Requires independent external power supply, positive and negative poles must not be reversed	0.5-1.5mm² (AWG 24-16)
Circuito principal (≤690 VCA)	Three-phase power supply L1/L2/L3 connected to incoming terminals, U/V/W connected to the motor	Selected according to motor current, recommended ≥2.5mm² (AWG 14)
Auxiliary Circuit	Auxiliary contact output for status indication or control	0.5-1.5mm² (AWG 24-16)

Troubleshooting Guide

Fenómeno de falla	Posibles causas	Soluciones
Motor fails to start	No 24V DC power supply in the control circuit; stop button not closed; pérdida de fase	Check power supply, buttons and wiring; measure three-phase voltage
Trips immediately after startup	Excessively low current setting value; motor locked-rotor; short circuit fault	Increase the current setting; check motor load; locate short circuit points
Overload trip during operation	Motor overload; excessively high ambient temperature; poor heat dissipation	Reduce load; improve ventilation; clean heat sinks
Phase loss protection activated	Three-phase power supply imbalance; loose wiring; blown fuse	Check power supply; tighten wiring; replace fuse
Ground fault trip	Damaged motor insulation; broken cable; excessively high ground resistance	Check motor insulation; replace cable; measure ground resistance

VII. Product Selection and Replacement

Selection Key Points: Select according to the motor’s rated current (8-32A), control voltage (24En DC) and protection requirements (standard type).
Replacement Suggestions: Can directly replace the corresponding models of Schneider’s old TeSys L series (p.ej., LUB32+LUA32), with compatible mounting dimensions.
Upgrade Solution: For advanced diagnostic functions, it can be replaced with LUCD32BL (advanced control unit), which adds fault recording, parameter setting and other functions.

As a standard control unit of Schneider’s TeSys U series, the LUCA32BL is an ideal choice for the control of small and medium-sized three-phase motors due to its modular design, comprehensive protection functions and convenient installation method. Combined with the LUB power base, it can provide a current protection range from 8A to 32A, compatible with three-phase motors below 15kW, and meet the basic control and protection needs in the field of industrial automation.