3RT2015-1KB41

The 3RT2015-1KB41 is a Siemens SIRIUS S00 miniature 3-pole contactor. The DC24V coil features dual surge suppression with a built-in suppressor diode and an external varistor, making it suitable for PLC output applications with stringent surge requirements. The main contacts are AC-3 rated at 7A, 3kW/400V, and equipped with one set of normally open auxiliary contacts.

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Photo of Siemens SIRIUS 3RT2015-1KB41 miniature contactor with built-in diode and varistor DC24V

Product Positioning

The 3RT2015-1KB41 is a model with a more complete surge suppression design among the S00 series DC24V screw terminal contactors. In addition to the built-in suppression diode in the coil, it is also equipped with a pluggable varistor module. This dual protection further reduces the voltage surge impact on the control circuit caused by the coil's de-energization, making it particularly suitable for applications with high requirements for PLC output point protection or complex electromagnetic environments. The auxiliary contact is a set of normally open (1NO) contacts, which can be used for operation signal feedback.

Core Product Advantages and Features

Dual Surge Suppression

The coil has a built-in suppression diode and an external varistor, providing more complete protection for the PLC output module.

1NO Normally Open Auxiliary Contact

It can be used for operation status feedback, interlock control, or indicator light circuits.

DC24V coil

Suitable for direct drive of PLC output points or 24V DC power supply, reducing the need for additional relay stations.

Screw terminal wiring

Both the main and auxiliary circuits are secured with screws, which facilitates wiring and future maintenance.

S00 Small Lightweight Frame

It shares the same appearance and installation specifications as other products in the same series, simplifying spare parts management.

High contact reliability

Official data shows that the failure rate is extremely low per 100 million operations, making it suitable for long-term stable operation.

project	Specification
model	3RT2015-1KB41
series	Siemens SIRIUS 3RT2 (S00)
Extreme number	3-pole (3P)
coil voltage	DC 24V (built-in suppression diode + external varistor)
Auxiliary contact	1NO (Group 1, normally open)
Wiring method	Screw terminals (acceptable wire diameters 0.5–4 mm²)
Rated operating current (AC-3)	7A
Rated operating power (AC-3, 400V)	3kW
Auxiliary contact AC-15 rated current (400V)	3A
Mechanical life	Approximately 30 million times
Electrical life (AC-3)	Approximately 200,000 uses (derating).
Enclosure protection rating	IP20
Installation method	35mm DIN rail (EN60715)
External dimensions (height x width x depth)	58 x 45 x 73 mm
net weight	0.294kg

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