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The Siemens 3RH1921-1EA20 is a first lateral auxiliary switch block designed for SIRIUS 3RT1 series contactors. It provides 2 Normally Open (NO) contacts with screw terminal connections, allowing the contactor to switch additional control circuits beyond its main power contacts.
This auxiliary switch is mounted on the side (laterally) of the contactor and is compatible with a wide range of 3RT1 contactor sizes, from S0 through S12. The snap-on mounting design enables quick installation without tools, while the screw terminals ensure reliable, vibration-resistant wiring for control and signaling circuits.
Item nº :
3RH1921-1EA20Pedido (MOQ) :
1Pagamento :
EXWOrigem do produto :
GermanyPorto de embarque :
Wuhan, Hubei, ChinaTempo de espera :
3-5 daysPeso :
0.049kgOverview
3RH1921-1EA20 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 |
|---|---|---|
| 3RH1921-1EA20 | 2 NO, lateral, screw terminal (this item) | Standard lateral auxiliary switch |
| 3RH1921-1FA22 | 2 NO + 2 NC, lateral, screw terminal | Includes NC contacts |
| 3RH1921-1KA20 | 2 NO, lateral, spring terminal | Spring connection variant |
| 3RH1921-1HA22 | 2 NO + 2 NC, front-mount | Front mounting position |
| 3RT1016-1BB41 | SIRIUS 3RT1 Contactor, S00 | Compatible contactor (example) |
1 × Siemens 3RH1921-1EA20 SIRIUS Auxiliary Switch Block (2 NO, 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 3RH1921-1EA20?
It is a lateral auxiliary switch block for SIRIUS 3RT1 contactors, providing 2 Normally Open (NO) 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 3RT10, 3RT12, 3RT145, 3RT146, and 3RT147 contactors across sizes S0 through S12.
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 NO (Normally Open) contacts with no NC 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-12, it is rated for 10 A at 24 V and 230 V. At AC-15, it is rated for 6 A at 24 V and 230 V, and 3 A at 400 V.
Q7: Does this switch function as a mirror contact?
Yes. When used with 3RT1 contactors, the auxiliary contacts comply with IEC 60947-4-1 for mirror contact function, providing reliable feedback of the main contact position.
Q8: What is the mechanical service life?
The mechanical service life is 10,000,000 operating cycles.
Q9: What are the dimensions and weight?
Dimensions are 10 mm (W) × 80 mm (H) × 71 mm (D). Net weight is 0.049 kg.
Q10: Is this a genuine Siemens product?
Yes. This is a genuine Siemens SIRIUS component with PM300: Active Product lifecycle status.
Q11: What should I verify before ordering?
Always verify the exact part number (3RH1921-1EA20), confirm your contactor model is a 3RT1 series in size S0–S12, and ensure that 2 NO contacts are sufficient for your control circuit requirements (consider the 3RH1921-1FA22 if NC contacts are also needed).
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