The Siemens 3RH2921-1DA02 is a lateral-mounting auxiliary switch block from the SIRIUS 3RH2 series, designed to expand the control circuit capacity of SIRIUS 3RT2 power contactors and 3RH2 contactor relays. It provides 2 Normally Closed (NC) contacts with screw terminals, enabling reliable status feedback, interlocking, and signaling functions in industrial control panels.
This auxiliary switch is a current, active product (PLM status PM300) and is the modern counterpart to the discontinued 3RH19 series, ensuring long-term availability for new installations and maintenance alike.
Item No :
3RH2921-1DA02Order(MOQ) :
1Payment :
EXWProduct Origin :
GermanyShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
0.040kgOverview
3RH2921-1DA02 SIMATIC PLC Module
New in stock
Origin from Germany
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
More Brands
| Part Number | Description | Key Difference |
|---|---|---|
| 3RH2921-1DA02 | 2 NC, lateral, screw terminal (this item) | Standard lateral auxiliary switch |
| 3RH2921-1DA11 | 1 NO + 1 NC, lateral, screw terminal | Includes NO contact |
| 3RH2921-1DA20 | 2 NO, lateral, screw terminal | NO contacts only |
| 3RH2911-1DA02 | 2 NC, front-mount, screw terminal | Front mounting position |
| 3RT2026-1AP00 | SIRIUS 3RT2 Contactor, S0, 25 A | Compatible host contactor (example) |
1 × Siemens 3RH2921-1DA02 SIRIUS Auxiliary Switch Block (2 NC, Lateral, Screw Terminal)
Note: Contactor and other accessories are sold separately.
In Stock – Ready to ship immediately
Genuine Siemens Product – Factory original SIRIUS component, PM300 Active status
Warranty Included – Purchase with confidence
Technical Support – Contactor compatibility assistance available
Q1: What is the Siemens 3RH2921-1DA02?
It is a lateral auxiliary switch block for SIRIUS 3RT2 contactors and 3RH2 contactor relays, providing 2 Normally Closed (NC) contacts with screw terminals. It mounts on the side of the contactor to expand its control circuit capacity .
Q2: Which contactors is this auxiliary switch compatible with?
It is compatible with 3RT2.2, 3RT2.3, and 3RT2.4 power contactors, as well as 3RH2 contactor relays .
Q3: Is this a front-mounting or side-mounting switch?
It is side-mounting (lateral)—the "first lateral" designation indicates it attaches to the side of the contactor, leaving the front face available for other accessories .
Q4: What is the contact configuration?
It has 2 NC (Normally Closed) contacts with no NO contacts .
Q5: What type of terminals does it use?
It uses screw terminals for the auxiliary circuit connections .
Q6: What is the rated operational current?
At AC-15, it is rated for 6 A at 24 V and 230 V, and 3 A at 400 V. At AC-12, it is rated for 10 A at 24 V and 230 V .
Q7: What is the mechanical service life?
The mechanical service life is 10,000,000 operating cycles .
Q8: What are the dimensions and weight?
Dimensions are approximately 10 × 57.4 × 66 mm (W × H × D). Net weight is 0.040 kg .
Q9: Is this a genuine Siemens product?
Yes. This is a genuine Siemens SIRIUS component with PM300: Active Product lifecycle status .
Q10: What is the country of origin?
The Czech Republic .
Q11: What should I verify before ordering?
Always verify the exact part number (3RH2921-1DA02), confirm your contactor model is a 3RT2 series or 3RH2 relay, and ensure that 2 NC contacts are sufficient for your control circuit requirements (consider the 3RH2921-1DA11 if an NO contact is also needed).
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