3RH2140-1SB40
The Siemens SIRIUS 3RH2140-1SB40 is an S00 coupled contact relay with 4 normally open contacts, a DC 24V coil, a coil operating range of 0.85–1.85×Us, a built-in suppressed diode, screw terminal connection, and is designed for direct drive of PLC outputs.
Product Positioning
The 3RH2140-1SB40 is a SIRIUS 3RH21 coupling contact relay designed for electronic controllers and PLC outputs. The coil operating range is 0.85–1.85 × Us, which can tolerate DC power supply voltage fluctuations. It has a built-in suppression diode and uses screw 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 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 1.6W, and it can be directly driven by the PLC transistor output point without the need for additional intermediate components.
Screw terminals
The screw terminal wiring is secure and suitable for general panel installation and future maintenance disconnection.