3RH2140-1BG40
The Siemens SIRIUS 3RH2140-1BG40 is an S00 size contact relay with 4 normally open (4NO) contacts, a DC 125V coil, and screw terminal connections. It is suitable for controlling electrical equipment powered by a 125V battery pack and is used for signal switching and amplification in control circuits.
Product Positioning
The 3RH2140-1BG40 is a basic 4-pole contact relay from the SIRIUS 3RH21 series. It uses a DC 125V coil and screw terminals, making it suitable for controlling electrical equipment powered by 125V batteries. 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.
DC125V coil
The DC 125V coil is suitable for controlling electrical equipment powered by a 125V battery pack; if power outage surges need to be suppressed, a diode or varistor module can be inserted 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.