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Schneider Electric LUCB12B

LUCB12B TeSys Ultra Motor Protection Control Unit, 24 V AC

MPNLUCB12B
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TeSys Ultra advanced control unit, LUCB12B, manual reset, 24 V AC control circuit, motor protection with overload and earth fault, Class 10 thermal, 45 x 66 x 60 mm.

$162.59 – $185.87Ref. price · indicative, final on quote
Schneider Electric LUCB12B datasheet (PDF)
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

LUCB12B key specifications
ParameterValue
Load type3-phase motor self-cooled
Range of productTeSys Ultra
Product or component typeAdvanced control unit
Immunity to voltage dips70 % / 500 ms IEC 61000-4-11
Coil voltage24 V AC
Voltage690 V IEC 60947-6-2 600 V UL 60947-4-1 600 V CSA C22.2 No 60947-4-1
Control circuit voltage limits20...26.5 V AC 24 V in operation 14.5 V AC 24 V drop-out
[Ue] rated operational voltage690 V AC
[Uimp] rated impulse withstand voltage6 kV IEC 60947-6-2
Typical current consumption140 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
Rated motor current adjustment range3...12 A
Motor power5.5 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

All specifications

LUCB12B additional specifications
ParameterValue
Network frequency40...60 Hz
Phase failure sensitivityYes
Utilisation categoryAC-44 AC-43 AC-41
IP degree of protectionIP20 front panel and wired terminals IEC 60947-1 IP20 other faces IEC 60947-1 IP40 front panel outside connection zone IEC 60947-1
Shock resistance10 gn power poles open IEC 60068-2-27 15 gn power poles closed IEC 60068-2-27
Operating altitude6561.68 ft (2000 m)
Vibration resistance2 gn 5...300 Hz power poles open IEC 60068-2-6 4 gn 5...300 Hz power poles closed IEC 60068-2-6
Non-dissipating shock wave1 kV serial mode IEC 60947-6-2 2 kV common mode IEC 60947-6-2
Depth2.4 in (60 mm)
Width1.8 in (45 mm)
Height2.6 in (66 mm)
StandardsEN 60947-6-2 IEC 60947-6-2 UL 60947-4-1, with phase barrier CSA C22.2 No 60947-4-1, with phase barrier
RangeTeSys
ResetManual reset
CategoryUS10I1122397
Fixing modePlug-in (front face)
Operating time35 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
Fire resistance1760 °F (960 °C) parts supporting live components IEC 60695-2-12 1202 °F (650 °C) IEC 60695-2-12
Heat dissipation2 W control circuit with LUB12 3 W control circuit with LUB32 3 W control circuit with LUB38
Device short nameLUCB
Compatibility codeLUCB
Device applicationMotor control Motor protection
Tripping threshold14.2 x Ir +/- 20 %
Protective treatmentTH IEC 60068
Thermal overload classClass 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
Immunity to microbreaks3 ms
Main function availableManual reset Protection against phase failure and phase imbalance Protection against overload and short-circuit Earth fault protection
Safe separation of circuit400 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
Product specific applicationBasic protection and advanced functions, communication
Resistance to fast transients2 kV 3 serial link IEC 61000-4-4 4 kV 4 all circuits except for serial link IEC 61000-4-4
Resistance to radiated fields9.1 V/m (10 V/m) 3 IEC 61000-4-3
Immunity to radioelectric fields10 V IEC 61000-4-6
Ambient air temperature for storage-40...185 °F (-40...85 °C)
Ambient air temperature for operation-13...158 °F (-25...70 °C)
Resistance to electrostatic discharge8 kV 3 in open air IEC 61000-4-2 8 kV 4 on contact IEC 61000-4-2

Product details

Integrator brief

The LUCB12B is the control unit brains in the TeSys Ultra system for motor protection. It handles AC-44 duty, so it's comfortable with high-inrush motor loads. Pair it with an LUB12 control circuit for a clean 24 V AC pick-up. Manual reset means someone has to hit the button after a trip—no auto-restart on a line that could cycle unexpectedly. Protection suite: overload with Class 10 tripping (good for standard motor starts), phase failure sensitivity, and earth fault detection. Short-circuit protection is built in as well, with a tripping threshold of 14.2 x Ir ±20%. Operating speed: 35 ms opening, 70 ms closing. Fast enough for most motor starting/stopping cycles.

Plug-in front face—clips onto the base without tools. Width 45 mm, depth 60 mm, height 66 mm. IP20 on the wired terminals, IP40 on the front panel outside the connection zone—fine behind a gland plate or inside a clean control cabinet. Keep it away from washdown areas.

Safe separation: 400 V SELV between control/auxiliary circuits and main circuit. Immunity to voltage dips down to 70% for 500 ms per IEC 61000-4-11.

Frequently asked questions

What is LUCB12B's listed depth?

Depth is 2.4 in (60 mm).

What range does LUCB12B belong to?

LUCB12B is part of the TeSys Ultra range.

What compliance standards does LUCB12B meet?

LUCB12B meets EN 60947-6-2, IEC 60947-6-2, UL 60947-4-1 (with phase barrier), and CSA C22.2 No 60947-4-1 (with phase barrier).

MPN
LUCB12B