3RH2140-2KB40
The Siemens SIRIUS 3RH2140-2KB40 is an S00 coupled contact relay with 4 normally open contacts, a DC 24V coil, a coil operating range of 0.7–1.25 × Us, a built-in suppressed diode, and spring terminal connection. It is designed for direct drive of PLC outputs.
Product Positioning
The 3RH2140-2KB40 is a SIRIUS 3RH21 coupling contact relay designed for electronic controllers and PLC outputs. The coil operating range is 0.7–1.25 × Us, which can tolerate DC power supply voltage fluctuations. It has a built-in suppression diode and uses spring terminals, and is commonly used for signal isolation and amplification between PLCs and field loads.
Core Product Advantages and Features
Expand the operating range of the coil
The coil has an operating range of 0.7–1.25 Us, which is more tolerant of DC power fluctuations than the standard type, and its operation is stable and reliable.
Built-in suppression diode
The coil has integrated a suppression diode, which absorbs surge voltage at the moment of power failure, reducing interference to the PLC output point and surrounding electronic modules.
Low coil power consumption
At 24V, the coil power is approximately 2.8W, and it can be directly driven by the PLC transistor output point without the need for additional intermediate components.
Spring terminals
Spring-clamp terminals require no screws, allowing for quick wiring and preventing loosening under vibration.