The Siemens 3RH2131-1KB40 is a compact and reliable SIRIUS auxiliary contactor coupling relay designed for switching, isolation, and signal interfacing in industrial control and automation systems. Featuring a low power consumption coil, this relay helps reduce energy usage and heat generation while delivering dependable switching performance in continuous-duty applications.
Designed with screw terminal connections, the relay ensures secure wiring, easy installation, and simple maintenance in control panels and automation systems. The compact construction allows efficient use of panel space, making it ideal for PLC interfaces, relay logic circuits, machine control systems, motor control applications, and industrial automation equipment.
Manufactured to Siemens SIRIUS quality standards, the 3RH2131-1KB40 offers excellent electrical reliability, long mechanical service life, and consistent operation even in demanding industrial environments. It is widely used as a coupling relay for interfacing between control devices, sensors, PLC outputs, and power control circuits.
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3RH2131-1KB40 |
| Product Series | SIRIUS 3RH2 |
| Product Type | Auxiliary Contactor / Coupling Relay |
| Coil Type | Low Power Consumption Coil |
| Connection Type | Screw Terminals |
| Mounting Type | DIN Rail / Screw Mount |
| Frame Size | S00 |
| Application | Control, Switching & Signal Coupling |
| Rated Insulation Voltage | 690 V |
| Mechanical Life | High Mechanical Endurance |
| Standards | IEC 60947 |
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