3RT2015-1BB42

The 3RT2015-1BB42 is a Siemens SIRIUS S00 series 3-pole power contactor with a 24V DC coil, one set of normally closed (1NC) auxiliary contacts, rated at 7A, 3kW/400V, and is the most commonly available standard specification on the market.

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Siemens 3RT2015-1BB42 DC24V coil S00 3-pole 1NC auxiliary contact

Product Positioning

The 3RT2015-1BB42 is the most popular standard 3-pole power contactor in the Siemens SIRIUS 3RT2 series. Its 24V DC coil operating voltage range is approximately 0.8 to 1.1 times its rated value. It is the most commonly used low-voltage DC control power supply specification in global control panel designs, offering high versatility and easy availability of spare parts. One normally closed (1NC) auxiliary contact is suitable for use as a power failure interlock, fault feedback, or safety interlock signal. It complements the auxiliary contacts of the 1BB41 (1NO) in the same series, allowing selection based on control logic requirements. The main contacts are 3-pole with a rated current of 7A. Under AC-3 conditions, it can load a 3kW/400V motor, with a maximum withstand voltage of 690V AC. Its mechanical life typically reaches 30 million operating cycles. It complies with IEC 60947-4-1 standards and has obtained multiple international certifications such as UL and CSA. Its applications cover general motor starting, pumps, fans, and various industrial automation control circuits.

Core Product Advantages and Features

24V DC market standard specification

It uses the most widely used control power supply voltage in the world, spare parts are readily available, and it has good compatibility with PLC output.

1 set of normally closed auxiliary contacts

Suitable for power outage interlocking, fault feedback, or safety interlock signal design, and can be used in conjunction with the 1NO model.

Mechanical life up to 30 million cycles

Its highly durable design reduces the frequency of maintenance and replacement in applications requiring frequent operation.

Compliant with IEC 60947-4-1 and has obtained multiple international certifications

With complete certifications such as UL and CSA, it is suitable for export equipment and designated use in multinational projects.

project	Specification
Product Type	Siemens SIRIUS 3RT2 Series 3-Pole Electric Contactor
Frame size	S00 (the smallest frame in this series)
coil voltage	24V DC
Auxiliary contact	Group 1 normally closed (1NC)
Rated operating current Ie (AC-3, 400V)	7 A
Rated operating power (AC-3, 400V)	3 kW
Maximum rated operating voltage	690V AC
Terminal type	Screw terminals (can connect 0.5–4 mm² wires)
External dimensions (width x height x depth)	Approximately 45 x 58 x 77.5 mm
net weight	Approximately 0.292 kg
Mechanical life	Typical 30 million operation cycles
Operating temperature range	-25°C ~ +60°C
Applicable Standards	IEC 60947-4-1
Major Certifications	CE, UL, CSA

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3RT2015-1BA42

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