3RT2016-2KB42

The German manufacturer calls it Koppelschütz (coupling contactor). The coil is designed for low power consumption and can be directly driven by the PLC digital output point. It has a built-in suppression diode protection output terminal and one set of normally closed auxiliary contacts to feedback the circuit break state.

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Siemens 3RT2016-2KB42 Coupling Contactor 24VDC PLC Direct Drive 1 Normally Closed

Product Positioning

The 3RT2016-2KB42 is explicitly labeled "Koppelschütz" (coupler) in the specifications of German distributors. This is a sub-series of the SIRIUS 3RT2016 family designed specifically for direct connection between electronic controllers and PLC output points. The coil voltage is 24V DC, with a built-in suppressed diode. The operating voltage range is approximately 0.7 to 1.25 times the rated value (narrower than the aforementioned wide-range coil version, but closer to the electrical characteristics of PLC output points). It allows direct digital output drive of the contactor coil from a programmable controller without the need for external relays, simplifying control panel wiring and reducing I/O point load. The main circuit maintains the 3RT2016 family's consistent S00 housing and AC-3 9A/4kW/400V specifications. The auxiliary contacts are one set of normally closed (NC) contacts, and the terminals are spring-clamp type, allowing for screwless wiring and making it suitable for rapid assembly in PLC automated production lines.

Core Product Advantages and Features

PLC output direct drive

The coil circuit is designed for the digital output characteristics of PLCs, and can directly trigger the contactor without the need for an external relay, simplifying control box wiring and reducing I/O costs.

Built-in suppression diode

The coil has a built-in suppressor diode to absorb the induced electromotive force generated during power failure, protecting the PLC output module or control circuit components.

1 set of normally closed auxiliary contacts

Provides circuit breaker feedback signals, which can be used for interlocking protection or status monitoring, meeting the common needs of automated control loops.

Spring-loaded quick-connect terminal

Both the main circuit and auxiliary contacts are spring-clamp type, allowing for plug-and-play wiring, suitable for large-scale and repetitive wiring operations on PLC control panels.

project	Specification
Main circuit structure	3-pole normally open (3NO) is suitable for direct starting of three-phase motors.
AC-3 Rated Current/Power	9 A / 4 kW (400V)
Maximum rated operating voltage	690V AC 50/60Hz
Case size	S00 (45 mm wide x 70 mm high x 73 mm deep, consistent across all versions)
Mechanical life	Approximately 30 million cycles.
Installation method	35mm standard DIN rail mounting
Auxiliary contact type	1 NC (normally closed)
Coil voltage/type	24V DC, built-in suppressed diode, suitable for direct drive of electronic/PLC outputs
Coil operating voltage range	Approximately 0.7 to 1.25 times the rated voltage (Uc)
Terminal type	Spring-clamp type (Federzuganschluss), screwless locking
Product Positioning	The German distributor refers to it as Koppelschütz (coupling contactor).
Protection level	IP20
Compliant with regulations	RoHS compliant

Recommend

3RT2016-2VB41

Belonging to the same V-shaped coil family as the 2VB42, the 2VB41 differs in that the auxiliary contacts are changed to one set of normally open (NO). The other wide-range coil characteristics, housing size and terminal type are exactly the same, making it convenient to select the corresponding version according to the control circuit logic.

3RT2016-2MB41-0KT0

The M-shaped coil is a 24V DC wide-range design, capable of stable engagement even with a voltage of 0.85~1.85 times the rated value. It has built-in diode protection, and this coil version is supplied in the market with the part number suffix "-0KT0".

3RT2016-2KB41

Like the 2KB42, the 2KB41 belongs to the Koppelschütz coupling contactor family. The difference is that the auxiliary contacts are a set of normally open ones. The coil is also designed for the electrical characteristics of PLC output, and it can be directly driven without the need for a relay.