The Siemens 3RH2140-1BB408K is an authentic SIRIUS 3RH2 auxiliary contactor relay engineered for high-precision signal interfacing, interlocking, and safety-related control circuits. Built in a compact Size S00 frame, it features 4 Normally Open (4NO) mechanically linked contact elements and operates on a 24V DC control coil. This relay is tailored for direct integration with PLCs, electronic controllers, and automated control panels in industrial environments.
4NO Mechanically Linked Contacts: Features 4 Normally Open positively driven contact elements designed for maximum switching safety, making it suitable for safety-related control and interlocking circuits.
24V DC Operating Coil: Direct DC control coil compatibility makes it ideal for seamless interfacing with PLCs, 24V power supplies, and digital control modules.
Compact Size S00 Frame: Saves valuable space inside control cabinets, machine automation units, and Motor Control Centers (MCCs).
Vibration-Proof Screw Terminals: Equipped with robust screw connection technology to ensure secure wiring, easy installation, and minimal maintenance downtime.
High Operational Reliability: Manufactured to Siemens SIRIUS standards, offering long mechanical service life, high switching frequency, and durable performance under heavy-duty usage.
Versatile Mounting Options: Designed for fast snap-on mounting on standard 35mm DIN rail as well as direct screw mounting.
PLC Signal Interfacing & Auxiliary Control Circuits
Safety Interlocking & Sequence Control Systems
Motor Control Centers (MCC) & Automation Distribution Panels
Machine Building, Packaging Lines & CNC Machinery
OEM Industrial Control Systems & Process Automation
Q1: What is the primary function and contact configuration of the Siemens 3RH2140-1BB408K?
A: It is an auxiliary contactor relay featuring 4 Normally Open (4NO) mechanically linked contacts, used for signal switching, PLC interfacing, and control interlocking.
Q2: What is the operating coil voltage for this relay?
A: This model operates on a 24V DC control coil, making it directly compatible with standard industrial automation and PLC outputs.
Q3: What does "mechanically linked contacts" mean for this relay?
A: Mechanically linked (positively driven) contacts ensure that Normally Open and Normally Closed contacts can never be closed simultaneously, providing critical fail-safe behavior required in safety circuits.
Q4: Can additional auxiliary contact blocks be attached to this S00 frame relay?
A: Yes, being part of the modular Siemens SIRIUS Size S00 ecosystem, you can easily snap on top-mounted or side-mounted auxiliary contact blocks to expand the contact configuration.
Siemens 3RH2911 Series Auxiliary Contact Blocks: Snap-on front-mounted blocks to add extra NO or NC auxiliary contacts.
Siemens 3RT201 Series Power Contactors (Size S00): Matching 24V DC power contactors for motor switching in the same control layout.
Siemens 3RT2916 Diode / Varistor Surge Suppressors: Plug-in surge suppression modules to protect delicate PLC transistor outputs from coil back-EMF spikes.
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3RH2140-1BB408K |
| Product Series | SIRIUS 3RH2 |
| Product Type | Auxiliary Contactor Relay |
| Frame Size | S00 |
| Contact Configuration | 4 Normally Open (4NO) |
| Contact Type | Mechanically Linked Contact Elements |
| Coil Type | DC Coil |
| Coil Voltage | 24V DC |
| Connection Type | Screw Terminals |
| Mounting | DIN Rail or Screw Mount |
| Rated Insulation Voltage | 690 V |
| Surge Withstand Voltage | 6 kV |
| Degree of Protection | IP20 (Front) |
| Mechanical Service Life | Up to 30 Million Operating Cycles |
| Application | Auxiliary Switching, PLC Interface & Control Circuits |
| Standard | IEC 60947 Series |
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