3RT20151FB443MA0

The S00 minimum frame 3-pole power contactor features a 24V DC coil with a built-in diode to suppress back EMF, spring-loaded (screwless) terminals, and a factory-fixed 2NO+2NC auxiliary contact group. It is rated for AC-3 7A/3kW (400V).

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Siemens 3RT2015-1FB44-3MA0 DC contactor, 24VDC, spring terminal 2NO+2NC

Product Positioning

The 3RT2015-1FB44-3MA0 is the smallest frame S00 3-pole power contactor in the SIRIUS 3RT2 series. It has 3NO main contacts, an AC-3 rated current of 7A, and is suitable for a motor load of approximately 3kW at 400V. The coil is 24V DC and has a built-in suppression diode to reduce surge interference to the control circuit when the coil is de-energized. The terminals are spring-loaded (screwless, quick-connect) and come pre-installed with 4 sets of auxiliary contacts (2NO + 2NC), eliminating the need for additional auxiliary contact modules. The "-3MA0" suffix in the order code is a Siemens factory addition; after comparing multiple catalogs, it is confirmed to be a specific shipping version designation. No publicly available explanations were found regarding actual differences; therefore, the basic specifications are used as the standard.

Core Product Advantages and Features

24V DC built-in diode coil

The coil voltage is 24V DC, and an internally integrated suppression diode is used. The back electromotive force is absorbed by the diode when the power is turned off, reducing surge interference to nearby electronic control components.

Spring-loaded quick-connect terminal

The main circuit uses spring-loaded (cage clamp) terminals, which can be used to crimp wires without screws, making it suitable for large-scale installations or applications requiring frequent maintenance and replacement.

2NO+2NC fixed auxiliary contacts

It comes pre-installed with 4 sets of auxiliary contacts (2 normally open + 2 normally closed) for signal feedback, interlocking or indicator light circuits, eliminating the need to purchase auxiliary contact sockets separately.

S00 Ultra-small Frame

It is the smallest S00 frame size in the 3RT2 series, suitable for applications with limited space in the control box and requiring high-density wiring.

project	Specification
Series/Framework	SIRIUS 3RT2015, S00 (Minimum Frame)
Number of poles/main contacts	3 poles, 3NO
AC-3 rated current	7 A
AC-3 rated power	3 kW / 400 V
Coil Specifications	24 V DC, built-in suppression diode
Auxiliary contacts	2NO+2NC, factory-fixed
Terminal type	Spring-loaded (screwless) terminals
Rated insulation voltage Ui	690 V
Rated impulse withstand voltage Uimp	6 kV
Protection level	IP20 (front of terminal)
Mechanical life	Approximately 30 million cycles (excluding auxiliary contact points)
Ambient temperature	Operating temperature: -25~+60°C / Storage temperature: -55~+80°C
Applicable Standards	IEC 60947-4-1, etc.
Order suffix	-3MA0 (factory version code; details of the differences are not specified in publicly available information)

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