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.

Share To

Siemens 3RT2016-2KB41 Coupling Contactor 24VDC PLC Direct Drive 1 Normally Open

Product Positioning

The 3RT2016-2KB41 is the normally open contact version of the aforementioned 2KB42, belonging to the Siemens SIRIUS "Koppelschütz" coupling contactor sub-series. It features a 24V DC coil with a built-in suppressed diode, and an operating voltage range of approximately 0.7 to 1.25 times the rated value. Designed to directly handle the drive current of PLC digital output points, it eliminates the need for additional relays to trigger contactor engagement, effectively simplifying control box wiring and reducing the load on PLC I/O points. The main circuit specifications are consistent with other members of the family, maintaining the S00 housing and AC-3 9A/4kW/400V. The only difference is that the auxiliary contacts, according to the order code rules, consist of one normally open (NO) set, which can be used as a signal feedback source or indicator light trigger source during operation. Spring-loaded terminals eliminate the need for screw fastening, making it suitable for large-scale wiring operations in automated production lines.

Core Product Advantages and Features

PLC output direct drive

The coil's electrical characteristics are designed for PLC digital output, allowing for triggering without the need for a relay, thus simplifying control box wiring and reducing I/O costs.

Built-in suppression diode

The absorption coil absorbs back electromotive force at the moment of de-energization, protecting the PLC output module and peripheral control components.

1 set of normally open auxiliary contacts

Suitable for use as a feedback mechanism for operating status and a signal source for indicator light circuits; the normally closed version can be selected based on the control logic.

Spring-loaded quick-connect terminal

Both the main circuit and auxiliary contacts are spring-clamp type, allowing for plug-and-play wiring, suitable for 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 NO (Normal Open)
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

3RT2016-2MB41-0KT0

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".

3RT2016-2JB41

The J-shaped coil is powered by 24V DC, with 3 normally open main contacts and 1 set of normally open auxiliary contacts. It operates at a temperature of -25~60°C and is certified to RoHS and UKCA standards.

3RT2016-2FB42

The F-shaped coil is 24V DC with a built-in suppression diode. It has 3 sets of normally open main contacts and 1 set of normally closed auxiliary contacts. The AC-3 rated value is 9A/4kW, and it is compatible with circuit breaker feedback or interlock protection circuits.