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, 短絡, phase loss, ground fault and other faults.
- Core Product Parameters
| Parameter Item | Specification Value | Description |
| Product Series | 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 | 8-32あ | Adjustable, compatible with the rated current of motors |
| 極数 | 3P (Three-phase) | Designed for three-phase asynchronous motor control |
| Control Circuit Voltage | 24V DC | Coil operating voltage, requiring independent external power supply |
| Rated Operating Voltage | 690V AC | Maximum operating voltage of the main circuit |
| Trip Class | Class 10 | Overload trip time: approximately 2 seconds at 10脳In |
| Compatible Power | 15kW@400V / 18.5kW@600V | Maximum power compatibility for three-phase motors |
| 保護機能 | Overload, Short Circuit, Phase Loss, Phase Imbalance, Ground Fault | Comprehensive motor protection meeting IEC standards |
| Reset Method | Manual Reset | Manual recovery is required after a fault to ensure safety |
| Mounting Method | 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
- 過負荷保護: Achieves Class 10 trip characteristics through adjustable current setting (8-32あ), compatible with motors of different power ratings.
- 短絡保護: 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.
- 地絡保護: Built-in ground fault detection function, with configurable ground fault current threshold to prevent leakage hazards.
- Status Indication: LED indicators display the running and fault statuses, facilitating quick fault diagnosis.
- 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 | Function | 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
| Accessory Model | Accessory Name | Function | Application Scenario |
| 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 |
- 典型的なアプリケーションシナリオ
- 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
- Installation Steps
- 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 “click” 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.
- Wiring Specifications
| Circuit Type | Wiring Requirements | Wire Specification |
| Control Circuit (24V 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
| Fault Phenomenon | Possible Causes | 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
- Selection Key Points: Select according to the motor’s rated current (8-32あ), control voltage (24V DC) and protection requirements (standard type).
- Replacement Suggestions: Can directly replace the corresponding models of Schneider’s old TeSys L series (例えば, 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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