3RT2015-1FB42

The 3RT2015-1FB42 is a Siemens SIRIUS S00 series 3-pole power contactor with a 24V DC coil and a built-in freewheeling diode to reduce power failure surges. It has one set of normally closed (1NC) auxiliary contacts, rated at 7A, 3kW/400V, and is suitable for electronic output circuits.

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Siemens 3RT2015-1FB42 DC24V with diode coil S00 3-pole 1NC auxiliary contact

Product Positioning

The 3RT2015-1FB42 is a 3-pole power contactor belonging to the Siemens SIRIUS 3RT2 series S00 frame. It has a coil voltage of 24V DC and features an integrated diode design, effectively suppressing surge voltage caused by coil inductance during power failure. This reduces the impact on PLC output terminals, relay contacts, or semiconductor drive circuits, making it particularly suitable for applications where the coil is directly driven by PLC digital outputs, electronic timers, or firmware control boards. This model is equipped with one normally closed (1NC) auxiliary contact, which can be used for power failure interlocking, fault feedback, or as a normally closed signal in an interlock circuit. The main contact is rated at 7A, with an AC-3 operating power of 3kW/400V. It is the smallest S00 frame contact in the SIRIUS series, suitable for direct starting and switching control of small motors, fans, pumps, and other loads.

Core Product Advantages and Features

The coil has a built-in freewheel diode.

The coil absorbs the surge current during a power outage, protecting the PLC output points or drive transistors and extending the controller's lifespan.

Suitable for direct drive of electronic control circuits

It has good compatibility with low-power drive sources such as PLC digital output and electronic timers, and does not require external surge suppression components.

1 set of normally closed auxiliary contacts

It provides power outage interlocking or fault feedback signals, facilitating the design of safety interlocks and status monitoring.

S00 Minimum Frame Design

With its compact size and locking screw terminals, it is easy to install and maintain even when densely packed inside the distribution box.

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 (built-in freewheel diode)
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 current of auxiliary contacts (AC-12)	10 A
Terminal type	Screw terminals (can connect 0.5–4 mm² wires)
External dimensions (width x height x depth)	Approximately 45 x 58 x 73 mm
net weight	Approximately 0.294 kg
Mechanical life	Typical 30 million operation cycles
Insulation voltage	690V
Rated impulse withstand voltage	6 kV
Protection level	IP20 (front)
Major Certifications	UL, CSA, CCC, KC, EAC

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