The Siemens 3RH2140-1AF008K is an authentic SIRIUS 3RH2 auxiliary contactor relay engineered for dependable signal switching, control logic, and safety-related interlocking. Designed in a compact Size S00 frame, it features 4 Normally Open (4NO) mechanically linked contact elements and operates on a 110V AC (50/60 Hz) control coil. Offering high switching endurance and exceptional mechanical service life, this relay is ideal for control cabinets, PLC interfaces, and automation panels.
4NO Mechanically Linked Contacts: Positively driven 4 Normally Open contact elements prevent conflicting contact states, delivering fail-safe performance required for safety-related control circuits.
110V AC Control Coil (50/60 Hz): Standard industrial AC control voltage for direct integration with control transformers, safety circuits, and conventional relay logic.
Compact Size S00 Frame: Saves valuable space inside control cabinets, machine automation units, and Motor Control Centers (MCCs).
Vibration-Proof Screw Terminals: Features robust screw connection technology to ensure tight, low-resistance conductor clamping and easy installation.
High Mechanical Endurance: Built to Siemens SIRIUS quality standards for millions of operating cycles, ensuring minimal panel downtime and low maintenance costs.
Dual Mounting Options: Quick snap-on mounting on standard 35mm DIN rail as well as direct panel screw mounting.
PLC Input/Output Signal Interfacing & Relay Logic Circuits
Safety Interlocking & Sequence Control Systems
Motor Control Centers (MCC) & Power Distribution Boards
Machine Tool Automation, Conveyors & Packaging Machinery
OEM Industrial Control Panels & Automation Infrastructure
Q1: What is the operating coil voltage for the Siemens 3RH2140-1AF008K relay?
A: This model operates on a 110V AC control coil at 50/60 Hz, making it ideal for standard 110V control transformer circuits.
Q2: What is the contact configuration for this auxiliary contactor relay?
A: It features 4 Normally Open (4NO) mechanically linked auxiliary contact elements.
Q3: What benefit do mechanically linked contacts provide in safety applications?
A: Mechanically linked (positively driven) contacts ensure that NO and NC contact sets can never be closed simultaneously, preventing overlapping contact states in critical safety interlocks.
Q4: Can I add extra auxiliary contact blocks to this S00 frame relay?
A: Yes, as 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 logic.
Siemens 3RH2911 Series Auxiliary Contact Blocks: Front-mounted or side-mounted blocks to add additional NO or NC auxiliary contacts.
Siemens 3RT201 Series Power Contactors (Size S00): Matching 110V AC power contactors for switching motor loads in the same panel setup.
Siemens 3RT2916 RC Element / Varistor Surge Suppressors: Plug-in surge suppression modules to protect 110V coil circuits from high-voltage inductive spikes.
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3RH2140-1AF008K |
| Product Series | SIRIUS 3RH2 |
| Product Type | Auxiliary Contactor Relay |
| Frame Size | S00 |
| Contact Configuration | 4 NO (Normally Open) |
| Contact Type | Mechanically Linked Contact Elements |
| Coil Type | AC Coil |
| Coil Voltage | 110 V AC, 50/60 Hz* |
| Connection Type | Screw Terminals |
| Mounting Type | DIN Rail or Screw Mount |
| Rated Insulation Voltage | 690 V |
| Mechanical Service Life | Up to 30 Million Operating Cycles |
| Degree of Protection | IP20 (Front) |
| Application | Auxiliary Switching, Control & Interlocking Circuits |
| Standard | IEC 60947 |
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