3RT2015-2KB41

It belongs to the same coupling contactor series as 2KB42, with a 24V DC coil and a pluggable surge suppression diode. The difference is that the auxiliary contacts are changed to a set of normally open (1NO), while the spring terminal design is the same.

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Siemens 3RT2015-2KB41 Coupling Contactor 24VDC External Diode 1NO

Product Positioning

Both the 3RT2015-2KB41 and 2KB42 are "coupling contactor relays" from the SIRIUS 3RT2015 series. Their main circuits, coils, and terminal designs are identical; the only difference lies in the normally open/normally closed configuration of the auxiliary contacts. The 2KB41 comes pre-installed with one normally open (1NO) contact, suitable for signal feedback or start confirmation circuits in the "on" state. This complements the normally closed (1NC) contact of the 2KB42, allowing for complementary selection based on the interlocking logic requirements. Both coils are 24V DC and equipped with an external (pluggable) surge suppression diode module, facilitating individual replacement based on wear and tear without requiring complete contactor body replacement. The terminals feature a spring-loaded design, and the main circuit maintains the AC-3 rated 7A, 400V 3kW S00 frame specification, suitable for control boxes with limited space but still requiring signal isolation and amplification functions.

Core Product Advantages and Features

Coupler contactor, can be selected in conjunction with 2KB42

The 1NO auxiliary contact design, compared with the 1NC model 2KB42 in the same series, allows for flexible selection of start or power-off feedback based on the interlocking circuit logic.

External surge suppression diode

The diode module can be plugged in and replaced, eliminating the need to replace the entire contactor body during maintenance and reducing long-term maintenance costs.

Spring terminal design

Spring-loaded terminals speed up wiring and maintenance, making them suitable for applications requiring frequent adjustments or large-scale wiring installations.

S00 framework, PLC signal intermediary application

The compact S00 frame, coupled with a coupling contactor for positioning, is suitable as an isolation amplifier for small signal outputs of PLCs.

project	Specification
Product Positioning	Coupling contactor relay
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, operating range 0.7~1.25×Uc
Surge suppression	External (pluggable) surge suppression diode
auxiliary contacts	1. No, the number of contacts is fixed and cannot be expanded.
Terminal type	Spring-type terminals
Rated insulation voltage Ui	690 V
Protection level	IP20 (front of terminal)
Ambient temperature	Operating temperature: -25~+60°C / Storage temperature: -55~+80°C
Applicable Standards	IEC 60947-4-1, etc.

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3RT2015-2JB42

It is a J-type coupling contactor line, with a 24V DC coil and spring terminals. The diode is built-in and fixed (not external). It is configured with normally closed (1NC) auxiliary contacts in accordance with the convention of the same series of models.

3RT2015-2JB41

The J-type coupling contactor integrates the 24V DC coil and diode into a fixed design, with spring terminals and a built-in set of normally open (1NO) auxiliary contacts. The actual measured weight is approximately 0.315 kg.

3RT2015-2FB42

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.