3RT2024-1KB40

Siemens 3RT2024-1KB40 24V DC Coil Contactor, Wide Voltage Range, 12A
Siemens 3RT2024-1KB40 24V DC Coil Contactor, Wide Voltage Range, 12A

The S0 contactor uses a 24V DC coil, and its holding voltage range is wider than that of a typical DC coil. It can still be stably engaged even in situations where the DC power supply voltage is unstable. It includes 1NO+1NC auxiliary contacts.

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Siemens 3RT2024-1KB40 24V DC Coil Contactor, Wide Voltage Range, 12A
Product Positioning

The 3RT2024-1KB40 is also a 24V DC coil version of the SIRIUS 3RT2 S0 chassis. Compared to the common -1BB40, its coil operating voltage range is widened to 0.7 to 1.25 times the rated value, providing higher operational reliability for applications with voltage drops or fluctuations in the DC power supply itself (such as battery power and long-distance wiring). The main circuit is the same AC-3 12A, 5.5kW/400V as other 3RT2024 models and has a UL certification file number, meeting the requirements for shipment of complete units requiring US standard verification.

Core Product Advantages and Features
Wide voltage tolerance 24V DC coil
With an operating voltage range of 0.7 to 1.25 times the rated value, it can withstand DC circuit voltage drop and power fluctuations better than standard DC coils.
UL certification files are traceable
It has a UL File Number, which is convenient for export to North America or for projects that require UL whole-machine verification.
1NO+1NC standard auxiliary contact
It has one set of normally open and one set of normally closed circuits to meet basic feedback monitoring needs, and the AC-12 is rated up to 10A.
Screw terminal compatible wiring
The main circuit (1-10mm²) and auxiliary circuit (0.5-2.5mm²) both support single-core, stranded, and fine stranded wires, offering high wiring flexibility.
project Specification
Rated operating current AC-3 12 A (400 V/500 V), 9 A (690 V)
Rated power AC-3 5.5 kW / 400 V
Control power supply voltage 24 V DC, operating range 0.7~1.25 times rated value
Auxiliary contacts 1 NO + 1 NC (Instantaneous type, AC-12 maximum 10A)
Extreme number 3 poles
Body size S0 (45×85×107 mm)
Terminal type Screw terminals (main circuit 1-10 mm² / auxiliary circuit 0.5-2.5 mm²)
Protection level IP20 (Front-facing fingertip protection)
Mechanical life Approximately 10 million operation cycles
Electrical life Approximately 200,000 cycles (AC-4, 5.5A/400V)
Rated insulation voltage 690 V, pollution level 3
Applicable Standards IEC 60947-4-1, IEC 61508 Type A, ISO 13849-1
International Certification UL (File E31519)

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