Schneider Electric LUB12 TeSys Ultra Power Base 12 A

LUB12 power base of a TeSys Ultra motor starter

The LUB12 is a Schneider Electric product listed in the datasheet as: Power base, TeSys Ultra, 12 A, screw clamps control. The LUB12 is the power part of a TeSys Ultra starter: it contains the contacts, the isolation function and the circuit-breaker-like short-circuit protection for a 12 A motor. A control unit (such as an LUCA or LUCM model) plugs into the front and decides how the motor is protected and controlled. Seven Star LLC supplies the LUB12 in Oman and the GCC as an independent supplier based in Muscat.

Reading the reference: LU marks TeSys Ultra, B the power base, and 12 the maximum motor current in amperes. The datasheet describes it as a non-reversing three-pole base with isolation capability.

Technical specifications of the LUB12

How the TeSys Ultra power base and control unit work together

Suitable for isolation: Yes. Rated operational current: 12 A <= 440 V; 12 A 500 V; 9 A 690 V. Utilisation categories: AC-43; AC-44; AC-41. Service breaking capacity: 50 kA 230 V. Control voltage: 24 V AC 50/60 Hz; 24 V DC; 48 to 72 V AC 50/60 Hz; 48 to 72 V DC; 110 to 240 V AC 50/60 Hz; 110 to 220 V DC. Auxiliary contacts: 1 NO + 1 NC.

A TeSys Ultra starter is two parts: the power base switches and protects the motor circuit, and the control unit holds the protection settings and the communication. The same base can take different control units, from simple standard types to multifunction units with diagnostics, which is why the base alone does not set thermal protection behaviour.

Where the LUB12 fits and what it combines with

The base accepts standard control units (LUCA, LUCB and LUCC types), advanced ones (LUCM), and communication modules; the specific list of compatible control units is on the datasheet. A base of this size is for motors up to 12 A, which at 400 V is roughly 5.5 kW.

Because the starter combines breaker and contactor functions in a compact housing, it is an alternative to a separate motor circuit breaker, contactor and overload set when panel space is tight.

Selection checklist for the LUB12

• Motor full-load current below 12 A.
• Which control unit is plugged in; the base does not set overload class.
• Control voltage for the coil: see the table above.
• Need for add-on modules for communications or a reversing function.
• Short-circuit rating at the supply voltage from the datasheet.
• Spare control units on site: they are field-replaceable.

Installing and servicing the LUB12

Mount on 35 mm rail or plate, fit the control unit by plugging it into the front, and connect motor and supply to the power terminals. The control unit locks into the base, and the power base can be isolated with the front lever.

Check tightness after the first week of operation, as thermal cycling can loosen screw terminals, and verify that the control unit matches the motor current before the first start.

Typical applications of the LUB12 in Oman and the GCC

Typical use is as a compact starter for a motor on small pumps, fans, conveyors and process units in the region. Because of the narrow body, they are popular in compact MCCs and skid-mounted panels.

Dimensions, environment and approvals of the LUB12

For the LUB12, plan the mounting space from the datasheet: 45 mm (W) x 154 mm (H) x 126 mm (D). The LUB12 weighs 0.9 kg. Mounting, derating and enclosure choices follow the environmental data below, which should be compared with the actual panel temperature and the dust and humidity of the site in Oman and the GCC.

Ambient temperature limits in the datasheet: -25 to 60 °C with LUCM. Ingress protection: IP20 IEC 60947-1 front panel and wired terminals; IP20 IEC 60947-1 other faces; IP40 IEC 60947-1 front panel outside connection zone. Operating altitude: 2000 m. Vibration resistance: 2 gn 5 to 300 Hz power poles open IEC 60068-2-27; 4 gn 5 to 300 Hz power poles closed IEC 60068-2-27. Shock resistance: 10 gn power poles open IEC 60068-2-27; 15 gn power poles closed IEC 60068-2-27. Standards listed: 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. Certifications listed for this reference: CE; UL; CSA; CCC; EAC; ASEFA; ATEX; Marine.

Information to send with an RFQ for the LUB12

• Full reference and quantity required
• Existing equipment, panel or rack it must fit
• Supply voltage, load or signal details of the application
• Required delivery location and timing
• Whether a spare, a replacement or a new installation

Documents and quotation

A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above.

Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and does not represent itself as an official channel of the manufacturer.