The Siemens 3RH2140-1AP008K is an authentic SIRIUS 3RH2 auxiliary contactor relay designed for high-performance signal interfacing, control logic, and safety interlocking. Engineered in a compact Size S00 frame, it features 4 Normally Open (4NO) mechanically linked contacts and operates on a 230V AC (50/60 Hz) control coil. Offering an outstanding mechanical service life of up to 30 million operating cycles, this relay delivers exceptional durability and switching precision in industrial automation panels.
4NO Mechanically Linked Contacts: Positively driven 4 Normally Open contact elements ensure strict fail-safe switching performance, making it highly suitable for safety-related control and interlocking circuits.
230V AC Control Coil (50/60 Hz): Designed for direct connection to standard AC control transformers, utility power lines, and conventional industrial control circuits.
Extreme Mechanical Endurance: Rated for up to 30 million operating cycles, dramatically reducing panel maintenance and component replacement costs.
Compact Size S00 Frame: Maximizes panel space efficiency inside control cabinets, machine automation enclosures, and Motor Control Centers (MCCs).
Vibration-Proof Screw Terminals: Features heavy-duty screw connection technology for secure conductor clamping, easy installation, and long-term connection stability.
Flexible Mounting Options: Quick snap-on mounting on standard 35mm DIN rail as well as direct panel screw mounting.
Relay Logic Circuits & Auxiliary Control Panels
PLC Input/Output Signal Interfacing & Buffer Relays
Safety Interlocking & Sequence Control Systems
Motor Control Centers (MCC) & Power Distribution Boards
OEM Machinery, Packaging Lines & Machine Tool Automation
Q1: What is the main difference between the 3RH2140-1AP008K and the 3RH2140-1BB408K model?
A: The primary difference is the operating coil voltage. The 3RH2140-1AP008K features a 230V AC (50/60 Hz) control coil, whereas the 1BB408K model operates on a 24V DC coil.
Q2: What is the contact arrangement for this auxiliary relay?
A: It is equipped with 4 Normally Open (4NO) mechanically linked auxiliary contacts.
Q3: What does the mechanical endurance rating of 30 million cycles mean?
A: It indicates that the physical switching mechanism of the relay is tested to perform up to 30 million mechanical operations without failing, offering exceptionally high reliability in high-frequency switching environments.
Q4: Can I add extra contact blocks to expand the contact configuration?
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 add additional NO or NC poles.
Siemens 3RH2911 Series Auxiliary Contact Blocks: Snap-on front/side contact blocks to expand circuit logic with additional NO/NC contacts.
Siemens 3RT201 Series Power Contactors (Size S00): Matching 230V AC power contactors for motor loads in the same panel setup.
Siemens 3RT2916 Varistor / RC Element Surge Suppressors: Plug-in surge suppression modules to protect coil control circuits from voltage transients.
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3RH2140-1AP008K |
| 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 | AC Coil |
| Coil Voltage | 230 V AC, 50/60 Hz |
| Connection Type | Screw Terminals |
| Mounting | DIN Rail or Screw Mount |
| Rated Insulation Voltage | 690 V |
| Degree of Protection | IP20 (Front) |
| Mechanical Life | Up to 30 Million Operating Cycles |
| Application | Auxiliary Switching, Control & Interlocking Circuits |
| Standard | IEC 60947 |
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