The LUCA32BL is a three-phase motor standard control unit belonging to Schneider Électrique‘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, court-circuit, phase loss, ground fault and other faults.
- Paramètres de base du produit
| Élément de paramètre | Specification Value | Description |
| Série de produits | 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 |
| Rated Current Range | 8-32UN | Réglable, compatible with the rated current of motors |
| Numéro de pôle | 3P. (Triphasé) | Designed for three-phase asynchronous motor control |
| Control Circuit Voltage | 24À DC | Coil operating voltage, requiring independent external power supply |
| Tension de fonctionnement nominale | 690V et | Maximum operating voltage of the main circuit |
| Trip Class | Class 10 | Overload trip time: environ 2 seconds at 10脳In |
| Compatible Power | 15kW@400V / 18.5kW@600V | Maximum power compatibility for three-phase motors |
| Fonctions de protection | Surcharge, Short Circuit, Phase Loss, Phase Imbalance, Ground Fault | Comprehensive motor protection meeting IEC standards |
| Méthode de réinitialisation | Manual Reset | Manual recovery is required after a fault to ensure safety |
| Méthode de montage | 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
- Protection contre les surcharges: Achieves Class 10 trip characteristics through adjustable current setting (8-32UN), compatible with motors of different power ratings.
- Short Circuit Protection: 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.
- Ground Fault Protection: Built-in ground fault detection function, with configurable ground fault current threshold to prevent leakage hazards.
- Indication d'état: LED indicators display the running and fault statuses, facilitating quick fault diagnosis.
- Conception modulaire: Can be combined with various accessories (such as communication module LUFN) to expand functions.
III. Companion Products and Compatibility
- Mandatory Companion Products
| Modèle de produit | Product Name | Fonction | Compatibility Description |
| LUB32 | Power Base | Provides main circuit contacts and mounting interface | Compatible with 8-32A control units, rated current 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
| Modèle d'accessoire | Nom de l'accessoire | Fonction | Scénario d'application |
| 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 |
- Scénarios d'application typiques
- 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
- Étapes d'installation
- 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, appuyez verticalement vers le bas jusqu'à ce qu'un “cliquez” un son se fait entendre pour confirmer qu'il est verrouillé en 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.
- Spécifications de câblage
| Circuit Type | Exigences de câblage | Spécification du fil |
| Circuit de contrôle (24À DC) | Requires independent external power supply, positive and negative poles must not be reversed | 0.5-1.5mm² (AWG 24-16) |
| Main Circuit (≤690V AC) | 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
| Phénomène de défaut | Causes possibles | Solutions |
| Motor fails to start | No 24V DC power supply in the control circuit; stop button not closed; phase loss | 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
- Points clés de la sélection: Select according to the motor’s rated current (8-32UN), control voltage (24À DC) and protection requirements (modèle standard).
- Replacement Suggestions: Can directly replace the corresponding models of Schneider’s old TeSys L series (par ex., 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.
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