3RH21401MB400KT0

Siemens 3RH2140-1MB40-0KT0 Coupling Relay 4NO DC24V
Siemens 3RH2140-1MB40-0KT0 Coupling Relay 4NO DC24V

The Siemens SIRIUS 3RH2140-1MB40-0KT0 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, low power consumption of 1.6W, and can be directly driven by PLC output. It features screw terminal connection and does not have built-in suppression components, which can be externally connected as needed.

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Product Introduction
Product Positioning

The 3RH2140-1MB40-0KT0 is a SIRIUS 3RH21 coupling contact relay, designed for electronic controllers and PLC outputs. The coil operating range is 0.85–1.85×Us, and it can tolerate DC power supply voltage fluctuations. It does not have built-in surge suppression components and uses screw terminals. It 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.
The coil does not contain a suppression element.
The coil does not come with a surge suppression component at the factory. A diode or varistor module can be inserted on the front side according to the circuit requirements.
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.
project Specification
Series/Size Class SIRIUS 3RH21 / S00
Contact configuration 4NO
coil voltage DC 24V
Coil operating range 0.85–1.85×Us
Surge suppression No built-in surge suppression element
Coil power (24V) 1.6W
Terminal type Screw terminals
Auxiliary switch expansion Non-expandable