3RH2140-2BB40
The Siemens SIRIUS 3RH2140-2BB40 is an S00 size contact relay with 4 normally open (4NO) contacts, a DC 24V coil, and spring terminal connections. It can be used with a 24V DC power supply and a PLC control system for signal switching and amplification in control circuits.
Product Positioning
The 3RH2140-2BB40 is a basic 4-pole contact relay from the SIRIUS 3RH21 series. It uses a DC 24V coil and spring terminals, making it compatible with 24V DC power supplies and PLC control systems. It can be used for PLC output expansion, interlocking control, and signal multiplication, and is a common intermediate relay choice in control panels.
Core Product Advantages and Features
4NO contact configuration
The device has four normally open instantaneous contacts, which can switch multiple control signals simultaneously to meet general interlocking and signal amplification requirements.
DC24V coil
The DC 24V coil can be used with a 24V DC power supply and a PLC control system; if power failure surges need to be suppressed, a diode or varistor module can be installed on the front.
Spring terminals
Spring-clamp terminals require no screws, allowing for quick wiring and preventing loosening under vibration.
Expandable to 8 poles
The front can be fitted with a 3RH29 auxiliary switch, and up to 4 more contacts can be added. The number of control points can be expanded using the same relay.