3RT2015-2FB42

Siemens 3RT2015-2FB42 DC contactor, 24VDC, spring terminal 1NC
Siemens 3RT2015-2FB42 DC contactor, 24VDC, spring terminal 1NC

Unlike the coupling contactor series, this model is classified as a general power contactor. It has a built-in diode and spring terminal in a 24V DC coil and is equipped with one set of normally closed (1NC) auxiliary contacts. It weighs approximately 0.314 kg.

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Siemens 3RT2015-2FB42 DC contactor, 24VDC, spring terminal 1NC
Product Positioning

The 3RT2015-2FB42 differs from the aforementioned K/J rail "coupling contactor" in its positioning. Multiple distributors (such as electricautomationnetwork and Conrad) classify it as a general "power contactor" rather than a coupling contactor relay, indicating its design is geared towards general load switching rather than signal intermediation. The coil is 24V DC and has a built-in surge suppression diode. The terminals use a spring-loaded design, and the auxiliary contacts are fixed at one set of normally closed (1NC). The measured net weight is approximately 0.314 kg, similar to the 2JB41 (0.315 kg) and 2KB42 (0.318 kg) in the same series, showing that the weight range for spring-loaded terminal series is generally between 0.31 and 0.32 kg. The main circuit specifications maintain the S00 frame AC-3 rated 7A, 3kW at 400V. Conrad also indicates that its withstand voltage can reach 690V AC, suitable for applications requiring high insulation margins.

Core Product Advantages and Features
Classification of general power contactors
Unlike the coupling contactor positioning of the K/J rail, various sources classify this model as a general power contactor, suitable for use as a direct load switch.
24V DC built-in diode
The built-in diode in the coil suppresses surges when the coil is de-energized, and the spring-type terminals speed up wiring operations.
1NC auxiliary contact
It comes with one set of normally closed auxiliary contacts, which is suitable for basic power failure reporting or interlocking circuit design.
Withstand voltage 690V AC
According to Conrad data, it can withstand 690V AC, and its insulation margin is better than that of general 220~400V applications, making it suitable for occasions with high safety margin requirements.
project Specification
Product Positioning General power contactor (non-coupled contactor)
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 1NC
Terminal type Spring-type terminals
net weight Approximately 0.314 kg
Withstand voltage (AC) 690 V AC (Conrad data)
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.

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