3RT2024-1BB40

Siemens 3RT2024-1BB40 24V DC Coil Contactor 1NO+1NC 12A
Siemens 3RT2024-1BB40 24V DC Coil Contactor 1NO+1NC 12A

The S0 standard contactor features a 24V DC coil with 1NO+1NC auxiliary contacts and weighs only 0.6 kg. It is the entry-level optional model with the highest shipment volume in the same series.

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Product Introduction
Product Positioning

The 3RT2024-1BB40 is the most common 24V DC coil basic model in the SIRIUS 3RT2024 series. Its main circuit has an AC-3 rated capacity of 12A, 5.5kW/400V, and features 1NO+1NC instantaneous auxiliary contacts, meeting the start/stop, interruption, and basic feedback requirements of most small motors. The unit is an S0 specification unit, measuring 45mm wide × 85mm high × 107mm deep, and weighs 0.6 kg. Its screw terminal wiring allows for quick installation, making it the most frequently specified entry-level model for production line spare parts and new control panels.

Core Product Advantages and Features
24V DC coil has high versatility
24V DC is the most common control power supply voltage in industrial control sites, and it offers good interchangeability of spare parts and ease of procurement.
1NO+1NC basic feedback contact
One set of normally open and one set of normally closed auxiliary contacts meet the basic requirements for operation indication and interlock control.
S0 body, lightweight at 0.6kg
Small in size and light in weight, it is suitable for dense installation inside the control box without taking up too much panel space.
10 million mechanical cycles life
It can maintain stable operation even after long-term, high-frequency opening and closing, reducing the frequency of maintenance and replacement.
project Specification
Rated operating current AC-3 12 A (400 V)
Rated power AC-3 5.5 kW / 400 V
Control power supply voltage 24 V DC, operating range 0.8~1.1 times rated value
Auxiliary contacts 1 NO + 1 NC (Instantaneous)
Extreme number 3 poles
Body size S0 (45×85×107 mm)
Terminal type The main circuit, auxiliary circuit, and coil all use screw terminals.
Protection level IP20 (Front-facing fingertip protection)
Mechanical life Approximately 10 million operation cycles
Electrical life Approximately 200,000 times (AC-4)
Rated insulation voltage 690 V, pollution level 3
net weight Approximately 0.6 kg
International Certification KC, EMC, Ship/Railway Environmental Confirmation