3RT2023-2BB40

The 3RT2023-2BB40 adopts a DC24V coil and spring-pressed terminal design, and is equipped with one set of normally open and one set of normally closed auxiliary contacts as standard. The main circuit has a rated current of 9A and 4kW at 400V, and belongs to the SIRIUS S0 series.

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Siemens 3RT2023-2BB40 DC24V Spring Terminal Electromagnetic Contactor 1NO+1NC 9A/4kW

Product Positioning

The 3RT2023-2BB40 is the most basic DC 24V spring terminal version of the Siemens SIRIUS 3RT2 miniature S0 frame contactor. Its main circuit specifications are consistent with the same series, with an AC-3 rated current of 9A, a rated power of 4kW at 400V, and up to 7.5kW at 690V. Compared to the screw terminal version (starting with 1), this model uses spring-press terminals, making it suitable for automated production lines and control panel manufacturers with large wiring volumes who want to reduce screw tightening time. The auxiliary contacts are a standard 1NO+1NC combination, meeting general interlocking and indicating needs. It is a common basic choice when replacing older models or designing new distribution boxes.

Core Product Advantages and Features

DC24V coil

The coil has a rated voltage of 24V DC and an operating voltage range of approximately 0.8 to 1.1 times the rated value, making it suitable for direct drive by a 24V DC control power supply (such as PLC output or switching power supply).

Spring-loaded crimp terminal design

Both the main circuit and the auxiliary circuit use spring-loaded terminals. The wiring is completed simply by pressing the wire in, eliminating the need for screwdrivers and reducing assembly time and human error when wiring large quantities of wires.

1NO+1NC standard auxiliary contact

It has one set of normally open and one set of normally closed auxiliary contacts, which can provide both operation indication and interlocking circuits at the same time. It is the most commonly used basic combination in control panel design.

S0 frame, AC-3 9A/4kW

The main contacts are three-pole, AC-3 rated current 9A, rated power 4kW at 400V, conforms to IEC/EN 60947-4-1, and has a mechanical life of 10 million cycles.

project	Specification
model	3RT2023-2BB40
Coil rated voltage	DC 24 V
Coil type	DC electromagnetic coil
Auxiliary contact configuration	1 NO + 1 NC (Instantaneous Type)
Wiring method	Screwless spring clamp terminals
Rated operating current Ie (AC-3, 400V)	9 A
Rated operating power (AC-3, 400V)	4 kW
Rated operating power (AC-3, 690V)	7.5 kW
Main contact pole number	3-pole (3NO)
Contactor size class	S0
External dimensions (width x height x depth)	45 x 85 mm, depth approximately 97 mm (AC coil) or 107 mm (DC coil) depending on coil type.
Rated insulation voltage Ui	690 V
Mechanical life	10 million cycles
Protection level	IP20 (Front-side touch protection, conforms to finger-proof electric shock structure)
Meets standards	It conforms to IEC/EN 60947-4-1 and has mirror contact capability.

3RT2023-2BB40

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