3RT1015-1BB42

The Siemens 3RT1015-1BB42 is a mini contactor from the SIRIUS classic series S00. It features a 24V DC coil with one set of normally closed auxiliary contacts and three normally open main contacts. It is rated at 7A and 3kW/400V for AC-3, and has screw terminal connections. It is compact and commonly used for on/off control of single motors in small pumps, fans, and other applications.

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Siemens 3RT1015-1BB42 SIRIUS S00 contactor 24VDC 1NC

Product Positioning

The 3RT1015-1BB42 is a miniature SIRIUS contactor belonging to the S00 frame. It uses a 24V DC coil to drive the main contacts and is equipped with one set of normally closed auxiliary contacts for convenient signal feedback in power failure protection or interlocking circuits. Compared to the 1NO version, the normally closed contacts are more suitable for abnormal monitoring or control logic that requires conduction when power is off.

Core Product Advantages and Features

24V DC coil drive

DC operating voltage, suitable for direct driving of coils by PLC output or DC power supply.

1NC normally closed auxiliary contact

When the contactor engages, the auxiliary contact disengages, making it suitable for abnormal monitoring and interlocking circuits.

3-pole normally open main contact

All three-phase main circuits are normally open, with a rated current of 7A.

AC-3 3kW/400V

It meets the starting and running requirements of a typical three-phase small induction motor.

S00 Minimum Frame

It shares the same external dimensions as 1HB41, which facilitates unified spare parts management.

Screw terminal wiring

Both the main circuit and the auxiliary circuit use screw terminals, which facilitates construction and maintenance.

project	Specification
series	SIRIUS classic 3RT1
Frame size	S00
coil voltage	24V DC
Auxiliary contact	1 NC (normally closed)
Main contact configuration	3-pole normally open (3NO)
Rated current (AC-3)	7A
Rated power (AC-3,400V)	3kW
Wiring method	Screw terminals
Installation method	35mm standard guide rail/screw mounting

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