3RH2131-2VB40
The Siemens SIRIUS 3RH2131-2VB40 is an S00 coupled contact relay with 3 normally open and 1 normally closed contacts, a DC 24V coil, a coil operating range of 0.85–1.85×Us, a built-in diode, and spring terminal connection. It is designed for direct drive of PLC outputs.
Product Positioning
The 3RH2131-2VB40 is a SIRIUS 3RH21 coupling contact relay designed for electronic controllers and PLC outputs. The coil operating range is 0.85–1.85 × Us, and it can tolerate DC power supply voltage fluctuations. It has a built-in diode and uses spring terminals, and is commonly used for signal isolation and amplification between PLCs and field loads.
Core Product Advantages and Features
Wide range coil voltage
The coil operates within a range of 0.85–1.85 × Us and can still operate reliably when the DC power supply voltage is too low or too high, making it suitable for power supplies such as battery buffers.
Built-in diode in coil
The coil has an integrated diode, which can absorb the surge voltage during power failure and protect the PLC output point and surrounding electronic modules.
Low coil power consumption
At 24V, the coil power is approximately 1.6W, 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.