SINAMICS SIRIUS series switchgear

(5) Selection and ordering precautions

Model coding logic: It is necessary to clarify "number of poles → contact type (NO/NC) → terminal type → coil voltage → special version", for example, in "3RH2122-1AB00", "22" represents 2NO+2NC, "1" represents screw terminal, and "AB00" represents 24V AC coil;

Minimum order unit (PU): 1 unit (single unit), discounts are available for partial bulk orders (please consult Siemens sales);

Special requirements: Railway application type (wide voltage coil) and latch type require separate confirmation of delivery time, non-standard voltage (such as 48V DC) can be customized according to the "3/75 page" requirements.

2. 3TH4 series (8-pole/10 pole, multi circuit type)

(1) Product positioning and core differences

Unlike the "compact" positioning of the 3RH2 series, the 3TH4 series focuses on multi pole numbers and high reliability, designed specifically for "multi loop centralized control" scenarios (such as complex motor control and machine tool hydraulic systems). The core differences are reflected in:

More poles: Only 8 poles (3TH42) and 10 poles (3TH43), supporting more independent circuit switching;

More stable structure: greater depth (AC type 97mm, DC type 130mm), stronger impact resistance (AC operation 12g/5ms);

Single terminal type: only screw terminals (M3.5), suitable for connecting large cross-sectional wires (up to 4mm ²);

Narrow environmental adaptability: operating temperature -25~+55 ℃ (5 ℃ lower than 3RH2), more suitable for industrial environments at room temperature.

(2) Product classification and key parameters

Product classification: Divided by pole number into 3TH42 (8 poles) and 3TH43 (10 poles), both support AC/DC coils. The model examples are as follows:

Series pole control voltage terminal type model example corresponding page number

3TH42 8-pole 230V AC (50Hz) screw terminal 3TH4280-0AP0 5/20

3TH42 8-pole 24V DC screw terminal 3TH4280-0BB4 5/20

3TH43 10 pole 230V AC (50Hz) screw terminal 3TH4310-0AP0 5/21

3TH43 10 pole 24V DC screw terminal 3TH4310-0BB4 5/21

Core technical parameters:

Insulation voltage (Ui): 690V, impulse withstand voltage (Uimp): 8kV (2kV higher than 3RH2);

Coil power consumption (AC 50Hz, cold state): closed 68VA/power factor 0.82, maintaining 10VA/power factor 0.29;

Contact current capacity (AC-15): 10A at 230V, 6A at 400V, 4A at 500V, 2A at 690V;

Mechanical lifespan: 30 million cycles (basic unit), electrical lifespan (AC-15/230V): 3.6 million cycles (3 times higher than 3RH2).

(3) Accessories and Special Features

Surge Suppressor: 3TX7402 series, including diodes (24~250V DC, 3TX7402-3A), varistors (24~600V AC, 3TX7402-3G), RC components (24~600V AC, 3TX7402-3R), directly installed on coil terminals to suppress disconnection surges;

Delay device: 3TX4180-0A (ON delay, 0.1~5s), suitable for circuits that require delayed start (such as fan soft start);

Railway application type: coil voltage range extension (0.85~1.1 × Us), model such as 3TH42. -0B., needs to be ordered according to the requirements on page 4/66.

Coupling relay

Coupling relays mainly achieve electrical isolation and signal level matching between control circuits and load circuits. The document covers three major series: 3RQ2, 3RQ3, and LZS/LZX, corresponding to "industrial shell type, narrow design type, and plug-in customized type", meeting different installation spaces and customization requirements.

3RQ2 series (industrial shell type, 22.5mm)

(1) Product positioning and core advantages

Replacing the traditional 3RS18 series, designed specifically for industrial grade signal coupling, with a 22.5mm wide industrial casing (titanium gray) that is visually consistent with the SIRIUS series. The core advantages include:

Wide voltage compatibility: 24~240V AC/DC coils, no need to distinguish between AC and DC, reducing inventory types;

High contact reliability: Some models use "hard gold-plated contacts" (AgNi+Au), which provide stable contact in low current (≥ 1mA) and low voltage (≥ 17V) scenarios;

Easy to maintain design: detachable terminals (screw/spring type), no need to disconnect wires to replace terminals; TOP wiring (front wire entry) increases wiring efficiency by 30%.

(2) Product Classification and Technical Parameters

Product classification: Divided by the number of contacts into 1 conversion (CO), 2 conversion, and 3 conversion. Model examples and parameters are as follows:

Number of contacts, terminal type, contact material, coil voltage range, model example, working temperature, insulation voltage, corresponding page number

1. Conversion screw terminal AgSnO2 24~240V AC/DC 3RQ2000-1AW00-40~+60 ℃ 300V 5/26

2 Conversion Spring Terminal AgSnO2 24~240V AC/DC 3RQ2000-2BW00-40~+60 ℃ 300V 5/26

3 conversion screw terminals AgNi+Au 24~240V AC/DC 3RQ2000-1CW01-40~+60 ℃ 300V 5/26

Electrical performance:

Load current (AC-15/250V): 3A;

Load current (DC-13/24V): 1A;

Mechanical lifespan: 10 million cycles, electrical lifespan (AC-15/230V): 100000 cycles;

Protection level: IP20 (front), preventing solid foreign objects from entering.