3RH2140-1BF40
The Siemens SIRIUS 3RH2140-1BF40 is an S00 size contact relay with 4 normally open (4NO) contacts, a DC 110V coil, and screw terminal connections. It is commonly used in DC 110V control circuits in power plants and substations for signal switching and amplification.
Product Positioning
The 3RH2140-1BF40 is a basic 4-pole contact relay from the SIRIUS 3RH21 series. It uses a DC 110V coil and screw terminals and is commonly found in DC 110V control circuits in power plants and substations. It can be used for PLC output expansion, interlocking control, and signal multiplication, making it a common intermediate relay choice for 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.
DC110V DC coil
DC 110V coils are commonly found in DC 110V control circuits in power plants and substations. To suppress power outage surges, diodes or varistor modules can be installed on the front.
Screw terminals
The screw terminal wiring is secure and suitable for general panel installation and future maintenance disconnection.
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.