3RH2140-1AK20
The Siemens SIRIUS 3RH2140-1AK20 is an S00 size contact relay with 4 normally open (4NO) contacts, an AC 120V 50/60Hz coil, and screw terminal connections. It is suitable for North American standard equipment using 120V control power supplies for signal switching and amplification in control circuits.
Product Positioning
The 3RH2140-1AK20 is a basic 4-pole contact relay from the SIRIUS 3RH21 series. It uses an AC 120V 50/60Hz coil and screw terminals, making it suitable for North American standard equipment using a 120V control power supply. 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.
AC120V coil
AC 120V 50/60Hz coil, suitable for North American standard equipment using 120V control power supply, eliminating the need for additional voltage conversion components.
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.