General
Manufacturer	Schneider Electric
Product family/series	TeSys U
Product type	Base unit / power base
Nominal current	12 A
Control unit configuration	Screw terminals
Number of poles	3-pole (3P)
Complementary
Heat dissipation	2 W for control circuit with LUCA, LUCB, LUCC, LUCD; 1.7 W for control circuit with LUCM
Safety reliability level	B10d = 1369863 cycles contactor with nominal load conforming to EN/ISO 13849-1; B10d = 20000000 cycles contactor with mechanical load conforming to EN/ISO 13849-1
Operating time	35 ms opening with LUCA, LUCB, LUCC, LUCD, LUCM for control circuit; 50 ms at >= 72 V closing with LUCA, LUCB, LUCC, LUCD for control circuit; 60 ms at 48 V closing with LUCA, LUCB, LUCC, LUCD for control circuit; 70 ms at 24 V closing with LUCA, LUCB, LUCC, LUCD for control circuit; 75 ms closing with LUCM for control circuit
Mechanical durability	15 Mcycles
maximum operating rate	3600 cyc/h
Product certifications	CE; UL; CSA; CCC; EAC; ASEFA; ATEX; Marine
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
[Ui] rated insulation voltage	690 V conforming to IEC 60947-6-2 (pollution degree 3); 600 V conforming to UL 60947-4-1; 600 V conforming to CSA C22.2 No 60947-4-1
[Uimp] rated impulse withstand voltage	6 kV conforming to IEC 60947-6-2
Safe separation of circuit	400 V SELV between the control and auxiliary circuits conforming to IEC 60947-1 appendix N; 400 V SELV between the control or auxiliary circuit and the main circuit conforming to IEC 60947-1 appendix N
Fixing mode	Clipped (DIN rail); Screw-fixed (plate)
Tightening torque	Control circuit: 0.8…1.2 N.m flat screwdriver 5 mm; Control circuit: 0.8…1.2 N.m Philips no 1 screwdriver 5 mm; Power circuit: 1.9…2.5 N.m flat screwdriver 6 mm; Power circuit: 1.9…2.5 N.m Philips No 2 screwdriver 6 mm; Power circuit: 1.9…2.5 N.m pozidriv No 2 screwdriver 6 mm
Width	45 mm
Height	154 mm
Depth	126 mm
Net weight	0.9 kg
Compatibility code	LUB
Contractual warranty
Warranty (in months)	18
Environment
IP degree of protection	IP20 conforming to IEC 60947-1 (front panel and wired terminals); IP20 conforming to IEC 60947-1 (other faces); IP40 conforming to IEC 60947-1 (front panel outside connection zone)
Protective treatment	TH conforming to IEC 60068
Ambient air temperature for operation	-25…60 °C with LUCM; -25…70 °C with LUCA, LUCB, LUCC, LUCD
Ambient air temperature for storage	-40…85 °C
Fire resistance	960 °C parts supporting live components conforming to IEC 60695-2-12; 650 °C conforming to IEC 60695-2-12
Operating altitude	2000 m
Shock resistance	10 gn power poles open conforming to IEC 60068-2-27; 15 gn power poles closed conforming to IEC 60068-2-27
Vibration resistance	2 gn (f= 5…300 Hz) power poles open conforming to IEC 60068-2-27; 4 gn (f= 5…300 Hz) power poles closed conforming to IEC 60068-2-27
Resistance to electrostatic discharge	8 kV level 3 in open air conforming to IEC 61000-4-2; 8 kV level 4 on contact conforming to IEC 61000-4-2
Non-dissipating shock wave	1 kV serial mode 24...240 V AC conforming to IEC 60947-6-2; 1 kV serial mode 48...220 V DC conforming to IEC 60947-6-2; 2 kV common mode 24...240 V AC conforming to IEC 60947-6-2; 2 kV common mode 48...220 V DC conforming to IEC 60947-6-2
Resistance to fast transients	2 kV class 3 serial link conforming to IEC 61000-4-4; 4 kV class 4 all circuits except for serial link conforming to IEC 61000-4-4
Resistance to radiated fields	10 V/m 3 conforming to IEC 61000-4-3
Immunity to radioelectric fields	10 V conforming to IEC 61000-4-6
Immunity to microbreaks	3 ms for control circuit
Immunity to voltage dips	70 % / 500 ms conforming to IEC 61000-4-11
Logistical informations
Country of origin	FR
Main
Range	TeSys
Product name	TeSys Ultra
Device short name	LUB
Product or component type	Non reversing power base
Device application	Motor control; Motor protection
Poles description	3P
[Ue] rated operational voltage	690 V AC for power circuit
Network frequency	40...60 Hz
[Ith] conventional free air thermal current	12 A
[Ie] rated operational current	12 A at
Utilisation category	AC-43; AC-44; AC-41
[Ics] rated service breaking capacity	50 kA at 230 V; 50 kA at 440 V; 10 kA at 500 V; 4 kA at 690 V
Auxiliary contact composition	1 NO + 1 NC
Auxiliary contacts type	type linked contacts (1 NO + 1 NC) conforming to IEC 60947-4-1; type mirror contact (1 NC) conforming to IEC 60947-1
[Uc] control circuit voltage	24 V AC 50/60 Hz; 24 V DC; 48...72 V AC 50/60 Hz; 48...72 V DC; 110...240 V AC 50/60 Hz; 110...220 V DC
Suitability for isolation
Packing Units
Unit Type of Package 1	PCE
Number of Units in Package 1	1
Package 1 Height	5.200 cm
Package 1 Width	13.500 cm
Package 1 Length	17.000 cm
Package 1 Weight	844.000 g
Unit Type of Package 2	S02
Number of Units in Package 2	10
Package 2 Height	15.000 cm
Package 2 Width	30.000 cm
Package 2 Length	40.000 cm
Package 2 Weight	8.698 kg
Unit Type of Package 3	P06
Number of Units in Package 3	160
Package 3 Height	75.000 cm
Package 3 Width	60.000 cm
Package 3 Length	80.000 cm
Package 3 Weight	147.668 kg

The Schneider Electric LUB12 is a universal base unit of the TeSys U series, specifically designed as a power base for industrial motor starters. It combines the functions of a motor protection switch and a contactor in a compact module, enabling efficient and reliable motor control. With a rated current of 12 A and a rated power of 0.1 to 5.5 kW, it covers a wide range of applications, particularly for drives with low to medium power. The compact width of only 45 mm for powers up to 15 kW ensures space-saving installation, especially in control cabinets with limited space. A key advantage of the LUB12 is its modular design: the control voltage and exact current range are set only during final assembly via a plug-in control unit, offering high flexibility and adaptability to different requirements. The integrated protection and switching combination is standard-equipped with two auxiliary contacts (1 NC + 1 NO) and complies with IEC 947-6-2 requirements, including arc-free coordination. This makes the device suitable for use in demanding industrial environments where reliability and safety are paramount.