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                  • SIEMENS 3RH1131-1BB40 Auxiliary Contactor

                    Product Overview

                    SIEMENS 3RH1131-1BB40 is a SIRIUS 3RH11 Auxiliary Contactor / Contactor Relay designed for switching and controlling auxiliary circuits in industrial automation systems. It is mainly used for control signal switching, electrical interlocking, PLC interface circuits, and contact multiplication applications.

                    This model features 3 normally open contacts + 1 normally closed contact (3NO + 1NC), with a 24 V DC coil, S00 size, and screw terminal connection.

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                    Specifications

                    • Brand: SIEMENS
                    • Series: SIRIUS 3RH11
                    • Model: 3RH1131-1BB40
                    • Product Type: Auxiliary Contactor / Contactor Relay
                    • Contact Configuration: 3NO + 1NC
                    • Coil Voltage: 24 V DC
                    • Frame Size: S00
                    • Identification Number: 31E
                    • Connection Type: Screw Terminals
                    • Rated Insulation Voltage: 690 V
                    • Auxiliary Contacts:
                      • Normally Open (NO): 3
                      • Normally Closed (NC): 1
                    • Protection Rating: IP20 (front)
                    • Mounting: DIN rail / panel mounting
                    • Standards: IEC 60947-5-1
                    • Mechanical Life: Approx. 30 million switching cycles

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                    Advantages & Features

                    • Reliable switching for industrial control circuits
                    • Multiple auxiliary contacts for flexible control design
                    • Compact S00 housing saves cabinet space
                    • Suitable for PLC signal interface applications
                    • High mechanical durability and switching reliability
                    • Compatible with Siemens SIRIUS contactor systems
                    • Easy integration into automation control panels
                    • Provides electrical interlocking and feedback functions

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                    Applications

                    • Industrial automation control panels
                    • Motor starter control circuits
                    • PLC output interface circuits
                    • Contactor interlocking systems
                    • Machine control equipment
                    • Factory automation systems
                    • Electrical control cabinets
                    • Signal switching applications

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                    Precautions

                    • Confirm coil voltage is 24 V DC before energizing
                    • Verify contact arrangement (3NO + 1NC) before wiring
                    • Do not exceed auxiliary contact current ratings
                    • Ensure proper terminal tightening
                    • Disconnect power before installation or maintenance
                    • Check compatibility when replacing older Siemens models 

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