IEC 60947-4-1 Standards for Contactors and Motor Starters Explained
Master AC-3 rating selection under IEC 60947-4-1 for contactors and motor starters, including utilization categories and coordination types. Shop at Stoklink.
- Part number
- LUCB12B
- Model no
- LUCB
- UL
- CSA
- CE
- CCC
- EAC
- Marine
TeSys UltraSchneider Electric LUCB12B TeSys U Advanced Control Unit 3-12 A 24 V AC Motor Starter Module
TeSys U advanced control unit, 3-12 A adjustable, Class 10 with diagnostics, 24 V AC coil
Description
About the LUCB
About the LUCB
The Schneider Electric LUCB12B is a TeSys U advanced control unit providing adjustable thermal-magnetic motor protection from 3 to 12 A plus diagnostic outputs. Plugged into an advanced LUB120, LUB320, or LUB380 power base, it forms a starter-controller with Class 10 overload tripping, phase-failure sensing, earth-fault detection, a thermal-alarm signal, and a test pushbutton for 3-phase motors up to 5.5 kW at 400 V, controlled from a 24 V AC supply.
Certifications & Standards
- CE
- UL
- CSA
- CCC
- EAC
- IEC 60947-6-2
- UL 60947-4-1
- CSA C22.2 No 60947-4-1
Selection Notes
The LUCB12B carries the same 3-12 A, Class 10 protection as the LUCA12B but adds a thermal-alarm output and test pushbutton for condition monitoring. Specify it where a PLC input needs early warning of an approaching overload trip, rather than only a post-trip fault contact. Step up to the LUCB18B equivalent once the motor's full-load current exceeds 12 A.
Specification
Full specification
Main 19
| Range | TeSys |
|---|---|
| Range of Product | TeSys Ultra |
| Product name | TeSys Ultra |
| Device short name | LUCB |
| Product or Component Type | Advanced control unit |
| Device Application | Motor control, Motor protection |
| Product Specific Application | Basic protection and advanced functions, communication |
| main function available | Manual reset, Protection against phase failure and phase imbalance, Protection against overload and short-circuit, Earth fault protection |
| Product compatibility | Power base LUB12, Power base LUB32, Power base LUB38, Power base LUB120, Power base LUB320, Power base LUB380, Reversing contactor breaker LU2B12B, Reversing contactor breaker LU2B32B |
| [Ue] rated operational voltage | 690 V AC |
| Network frequency | 40...60 Hz |
| Load type | 3-phase motor self-cooled |
| Utilisation category | AC-44, AC-43, AC-41 |
| Motor power kW | 5.5 kW 400...440 V AC 50/60 Hz, 5.5 kW 500 V AC 50/60 Hz, 9 kW 690 V AC 50/60 Hz |
| rated motor current adjustment range | 3…12 A |
| Thermal overload class | Class 10 40…60 Hz -13…158 °F (-25…70 °C) IEC 60947-6-2, Class 10 40…60 Hz -13…158 °F (-25…70 °C) UL 508 |
| Tripping threshold | 14.2 x Ir +/- 20 % |
| Phase failure sensitivity | Yes |
| [Uc] control circuit voltage | 24 V AC |
Complementary 15
| Control circuit voltage limits | 20...26.5 V AC 24 V in operation, 14.5 V AC 24 V drop-out |
|---|---|
| Typical current consumption | 140 mA 24 V AC I maximum while closing with LUB12, 220 mA 24 V AC I maximum while closing with LUB32, 220 mA 24 V AC I maximum while closing with LUB38, 70 mA 24 V AC I rms sealed with LUB12, 90 mA 24 V AC I rms sealed with LUB32, 90 mA 24 V AC I rms sealed with LUB38 |
| Heat dissipation | 2 W control circuit with LUB12, 3 W control circuit with LUB32, 3 W control circuit with LUB38 |
| Operating time | 35 ms opening with LUB12 control circuit, 35 ms opening with LUB32 control circuit, 35 ms opening with LUB38 control circuit, 70 ms closing with LUB12 control circuit, 70 ms closing with LUB32 control circuit, 70 ms closing with LUB38 control circuit |
| Reset | Manual reset |
| Standards | EN 60947-6-2, IEC 60947-6-2, UL 60947-4-1, with phase barrier, CSA C22.2 No 60947-4-1, with phase barrier |
| Product Certifications | CE, UL, CSA, CCC, EAC, ASEFA, ATEX, Marine |
| [Ui] rated insulation voltage | 690 V IEC 60947-6-2, 600 V UL 60947-4-1, 600 V CSA C22.2 No 60947-4-1 |
| [Uimp] rated impulse withstand voltage | 6 kV IEC 60947-6-2 |
| Safe separation of circuit | 400 V SELV between the control and auxiliary circuits IEC 60947-1, 400 V SELV between the control or auxiliary circuit and the main circuit IEC 60947-1 |
| Fixing mode | Plug-in (front face) |
| Width | 1.8 in (45 mm) |
| Height | 2.6 in (66 mm) |
| Depth | 2.4 in (60 mm) |
| Compatibility code | LUCB |
Environment 15
| IP degree of protection | IP20 front panel and wired terminals IEC 60947-1, IP20 other faces IEC 60947-1, IP40 front panel outside connection zone IEC 60947-1 |
|---|---|
| Protective treatment | TH IEC 60068 |
| Ambient air temperature for operation | -13…158 °F (-25…70 °C) |
| Ambient Air Temperature for Storage | -40…185 °F (-40…85 °C) |
| Operating altitude | 6561.68 ft (2000 m) |
| Fire resistance | 1760 °F (960 °C) parts supporting live components IEC 60695-2-12, 1202 °F (650 °C) IEC 60695-2-12 |
| Shock resistance | 10 gn power poles open IEC 60068-2-27, 15 gn power poles closed IEC 60068-2-27 |
| Vibration resistance | 2 gn 5…300 Hz power poles open IEC 60068-2-6, 4 gn 5…300 Hz power poles closed IEC 60068-2-6 |
| Resistance to electrostatic discharge | 8 kV 3 in open air IEC 61000-4-2, 8 kV 4 on contact IEC 61000-4-2 |
| Non-dissipating shock wave | 1 kV serial mode IEC 60947-6-2, 2 kV common mode IEC 60947-6-2 |
| Resistance to radiated fields | 9.1 V/m (10 V/m) 3 IEC 61000-4-3 |
| Resistance to fast transients | 2 kV 3 serial link IEC 61000-4-4, 4 kV 4 all circuits except for serial link IEC 61000-4-4 |
| Immunity to radioelectric fields | 10 V IEC 61000-4-6 |
| Immunity to microbreaks | 3 ms |
| Immunity to voltage dips | 70 % / 500 ms IEC 61000-4-11 |
Show all 63 specifications ↓ Show less ↑14 more values in Identification, Contractual warranty, Logistics.
Identification 8
| Part number | LUCB12B |
|---|---|
| Type designation | LUCB |
| Brand | Schneider Electric |
| Condition | New, factory sealed |
| Source | Schneider Electric and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 3389110364156 |
Contractual warranty 1
| Warranty (in months) | 18 |
|---|
Logistics 5
| Country of origin | FR |
|---|---|
| Shipping weight | 0.123 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 30 Oct 2026
Documents
Documents for LUCB12B
No documents are on file for this part yet.
Ask us for the datasheet
Certifications
Certifications and standards
- UL
- CSA
- CE
- CCC
- EAC
- Marine
- EN 60947-6-2
- IEC 60947-6-2
- UL 60947-4-1
- with phase barrier
Quick answers
Questions about the LUCB
What is the rated current of LUCB?
The rated current of LUCB is 12 A.
Which supply voltage is LUCB rated for?
The rated operational voltage of LUCB is 24 V AC.
What is the HS code of LUCB for customs?
The tariff (HS) code on file for LUCB is 853650.
What is the EAN of LUCB?
The EAN (GTIN) of LUCB is 3389110364156.
Where does LUCB ship from, and how fast?
LUCB ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Guides
Guides for motor starters
NEMA vs IEC Contactor Standards: Key Differences and Size Comparison
Compare AC3 rating IEC contactors versus NEMA size codes, with cross-reference tables, derating formulas, and selection tips for engineers. Shop at Stoklink.
How to Size a Contactor for a 3-Phase Motor: Engineer Guide
Size a contactor for a 3-phase motor using IEC 60947-4-1 methodology, AC-3 vs AC-4 categories, NEMA equivalents, and Type 2 coordination. Shop at Stoklink.
Reviews
Customer reviews
Series
Schneider Electric TeSys Ultra
- Brand
- Schneider Electric
- Series
- TeSys Ultra
