Title: Siemens 3RA1145-4KB45-1BB4 Sirius Direct-On-Line Motor Starter, S2, 32A, 15kW, 400V AC, Thermal Overload Relay

Product Overview:
The Siemens 3RA1145-4KB45-1BB4 Sirius Direct-On-Line (DOL) Motor Starter is a high-performance, pre-assembled and tested solution engineered for the reliable and efficient control of three-phase AC motors. This robust S2 size starter seamlessly integrates a powerful contactor with a precise, adjustable thermal overload relay, offering comprehensive protection against overloads, phase failures, and short circuits. Designed for demanding industrial environments, the 3RA1145-4KB45-1BB4 ensures seamless motor operation, significantly reducing unscheduled downtime and extending the lifespan of connected equipment. Its compact footprint, user-friendly features, and adherence to global standards make it an ideal choice for a wide array of applications requiring dependable motor starting and stopping. Invest in the superior quality, safety, and operational efficiency provided by this essential component for modern industrial automation and electrical control systems.

Key Features & Benefits:

 Integrated Direct-On-Line (DOL) functionality for straightforward and efficient motor starting.
 Robust Siemens Sirius S2 size contactor ensures high switching capacity and exceptional mechanical and electrical service life.
 Built-in adjustable thermal overload relay provides reliable and accurate protection against motor damage from overcurrents, phase unbalance, and overheating.
 Compact and space-saving design, optimizing valuable panel space within control cabinets and electrical enclosures.
 Easy and quick installation with clearly marked screw terminals for secure and efficient wiring, significantly reducing commissioning time.
 High operational reliability and durability, ensuring consistent performance even in demanding industrial conditions and fluctuating loads.
 Equipped with essential auxiliary contacts (1 Normally Open + 1 Normally Closed) for status indication, interlocking, and seamless integration into complex control circuits.
 Energy-efficient operation, contributing to reduced power consumption and lower operational costs over the product's lifespan.
 Compliance with international standards (IEC, UL, CSA) for global applicability, enhanced safety, and regulatory acceptance.
 Designed for flexible mounting options, including standard DIN rail or direct screw mounting, adapting to various installation requirements.
 Enhances overall motor protection, preventing costly repairs, minimizing production interruptions, and extending the service life of industrial motors.

Applications:

The Siemens 3RA1145-4KB45-1BB4 DOL Motor Starter is a versatile and indispensable component suitable for a broad spectrum of industrial and commercial applications, including:
 Controlling pumps in water treatment plants, HVAC systems, and various industrial fluid transfer processes.
 Operating fans and ventilation systems in commercial buildings, factories, and cleanroom environments.
 Managing conveyor belts, hoists, and other material handling equipment in logistics and manufacturing.
 Starting and stopping compressors in refrigeration units, air supply systems, and industrial gas applications.
 Integration into machine tools, processing machinery, and packaging equipment for automated operations.
 General motor control in manufacturing plants, workshops, agricultural facilities, and municipal infrastructure.
 Any application requiring reliable, protected, and direct starting of three-phase asynchronous motors up to 15 kW.

Technical Specifications:

 Part Number: 3RA1145-4KB45-1BB4
 Part Number (without special characters): 3RA11454KB451BB4
 Product Type: Direct-On-Line (DOL) Motor Starter
 Series: Siemens Sirius 3RA11
 Size: S2
 Rated Operational Voltage (Ue): 400 V AC (Main Circuit)
 Rated Operational Current (Ie): 32 A
 Rated Motor Power (at 400V AC): 15 kW
 Control Supply Voltage (Uc): 230 V AC, 50/60 Hz
 Overload Release Setting Range: 25 - 32 A (Adjustable)
 Auxiliary Contacts: 1 Normally Open (NO) + 1 Normally Closed (NC)
 Mounting Type: DIN Rail (35mm) or Screw Mounting
 Protection Class: IP20 (Terminals)
 Operating Temperature Range: -25 °C to +60 °C
 Weight: Approximately 1.5 kg
 Standards Compliance: IEC 60947, UL, CSA, CE