SINAMICS SIRIUS series switchgear

SINAMICS SIRIUS series switchgear

Contactor Relay

Contactor relay is a key component for achieving "signal amplification and circuit switching" in industrial control. The document focuses on the 3RH2 and 3TH4 series, which complement each other in positioning and adapt to different scene requirements.

3RH2 series (size S00, compact)

(1) Product positioning and core features

Specially designed for compact control cabinets, with a size of only S00 (45mm wide), supporting 4-pole, 8-pole, and 4-pole latch types, it is the "basic contactor relay" of Siemens SIRIUS series, with core advantages including:

Multiple terminal selection: screw terminals (traditional wiring) and spring terminals (push in, tool free quick wiring) are optional;

Climate adaptation: operating temperature -25~+60 ℃, storage temperature -55~+80 ℃, suitable for use in high/low temperature industrial environments (such as cold chain workshops and metallurgical plants);

Safety compliance: Compliant with the IEC 60529 finger protection standard, both the basic unit and auxiliary switch have "forced guide contacts" (Appendix L of IEC 60947-5-1), which can be used for safety related applications (such as emergency stop circuits).

(2) Detailed product classification and model analysis

According to their functions and application scenarios, the 3RH2 series can be divided into four categories, with model codes following a fixed logic ("3RH2 @ @ - @ @ @ @ 0- @ @ @ @"). The meanings and examples of each field are as follows:

Product type Pole number Terminal type Coil voltage Model example Key characteristics Corresponding page numbers

Standard contactor relay 4-pole screw terminal 24V AC (50/60Hz) 3RH2140-1AB00 basic model, 4NO contact, terminal identification in accordance with EN 50011 5/12, 5/13

Standard contactor relay 8-pole spring terminal 230V AC (50/60Hz) 3RH2244-2AP00 8-pole (4NO+4NC) with permanently installed auxiliary switches 5/12, 5/13

Lock type contactor relay 4-pole screw terminal 24V DC 3RH2440-1BB40 requires external signal unlocking, suitable for "hold type circuit" (such as gate control) 5/12, 5/13

Coupling contactor relay (PLC compatible) 4-pole screw terminal 24V DC 3RH2140-1HB40 low power consumption (2.8W), wide coil working range (0.7~1.25 × Us), compatible with PLC solid-state output 5/14, 5/15

Railway application type contactor relay 4-pole screw terminal wide voltage coil 3RH2122-2K.40 coil voltage range extension, anti vibration (AC operation 11.4g/5ms) 4/64

(3) Key technical parameters (detailed explanation by dimension)

Technical parameters are the core basis for selection, and the document specifies the electrical, mechanical, and environmental performance of the 3RH2 series through tables and charts. The core data is as follows:

Size and Installation:

Component type Terminal type Width x Height x Depth (mm) Installation method

Basic unit screw terminal 45 × 58 × 73 fixed with screws/TH 35 rail clamp

Basic unit spring terminal 45 × 70 × 73 fixed with screws/TH 35 rail clamp

Basic unit+front auxiliary switch screw terminal 45 × 58 × 117 TH 35 rail card installation

Basic unit+functional module spring terminal 45 × 70 × 147 TH 35 rail card installation

Electrical performance:

Insulation voltage (Ui, pollution level 3): 690V, suitable for medium and high voltage industrial circuits;

Surge withstand voltage (Uimp): 6kV, strong resistance to grid surges;

Coil power consumption (cold state, 1.0 × Us):

AC 50Hz: Close at 37VA/power factor 0.8, maintain at 5.7VA/power factor 0.25;

AC 60Hz: closed 33VA/power factor 0.75, maintained 4.4VA/power factor 0.25;

DC: closed=hold, 4.0W (low power consumption suitable for battery powered scenarios);

Contact reliability: Contact stability at 17V/1mA (IEC 60947-5-4), fault frequency<10 ⁻⁸ (<1 fault per 100 million operations).

Lifespan and Durability:

Component type Mechanical life (10000 cycles) Electrical life (AC-15/230V, 10000 cycles) Remarks

Basic unit 3000 100 without auxiliary accessories, randomly switched (asynchronous phase)

Basic unit+auxiliary switch 1000 50 Auxiliary switch is front mounted, 4-pole maximum expansion

Solid state compatible auxiliary switch 500 30 compatible with solid-state circuits, without forced guiding contacts

(4) Accessory System and Application Expansion

The 3RH2 series supports a variety of accessories, which can achieve functional upgrades and convenient maintenance. The core accessories are as follows:

Accessory type, model, example, function description, installation method, corresponding page number

Auxiliary switch 3RH2911-. NF. 1-pole/2-pole, front/side mounted, expansion contact quantity (maximum 4-pole) snap fit installation 3/89, 3/99

Functional modules 3RA281., 3RA283. Direct start, star delta start module, integrated control logic front mounted 3/107

Surge suppressor 3RT2916-4MA10 RC component/varistor/diode, suppression coil disconnect surge front mounted, with LED indication 3/104, 3/105

Additional load module 3RT2916 increases allowable residual current (compatible with high residual current PLC output) Front mounted 3/121

Anti misoperation cover plate 3RT2916-4MA10 sealed terminal, preventing accidental contact or tampering with snap on cover 3/119