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3RH1921-1DA11
Siemens
The Siemens 3RH1921-1DA11 is a 2-pole (2NO) auxiliary switch block from the SIRIUS 3RH19 series, designed for plug-in (snap-on) mounting on Siemens SIRIUS 3RT1 (S00, S0, S2, S3) and 3RT2 (S00, S0) contactors. It expands the number of auxiliary contacts for control circuit applications including contactor status signaling, interlocking, holding circuits, and PLC feedback. Rated for 10A at 24V AC/DC, 6A at 230-240V AC, and 3A at 400V AC (AC-15), with a rated insulation voltage of 690V and 6kV impulse withstand. The module features screw terminals, IP20 finger-safe design, weighs only 43g, and operates from -25°C to +60°C, compliant with IEC 60947-5-1 standards.
FAQ
Q: What is the Siemens 3RH1921-1DA11 used for?
A: It is a 2NO auxiliary switch block that snaps onto Siemens SIRIUS contactors to expand auxiliary contacts for control signaling, interlocking, and PLC feedback.
Q: Which contactors is the 3RH1921-1DA11 compatible with?
A: Siemens SIRIUS 3RT1 contactors (sizes S00, S0, S2, S3) and 3RT2 contactors (sizes S00, S0).
Q: What is the contact configuration?
A: 2NO (2 Normally Open contacts) — both contacts close when the contactor coil is energized.
Q: What are the electrical ratings?
A: Up to 10A at 24V AC/DC, 6A at 230-240V AC, 3A at 400V AC under AC-15 utilization category. Maximum 10A at 24V DC under DC-13.
Q: How is the 3RH1921-1DA11 mounted?
A: Plug-in (snap-on) mounting directly onto the contactor body or onto an existing auxiliary contact block stack.
Q: What is the insulation voltage rating?
A: Rated insulation voltage (Ui) of 690V with 6kV impulse withstand voltage (Uimp).
Q: What are the operating temperature limits?
A: -25°C to +60°C for operation (open or enclosed), -55°C to +80°C for storage.
Q: What standards does this product comply with?
A: IEC 60947-5-1 and EN 60947-5-1 for low-voltage switchgear and controlgear.
| Siemens SIRIUS 3RH1921-1DA11 Auxiliary Switch Block (2NO) | |
| Siemens 3RH1921-1DA11 - Technical Specifications | |
| Feature | Specification |
| - | - |
| Manufacturer | Siemens |
| Product Family | SIRIUS 3RH19 |
| Order Number (MLFB) | 3RH1921-1DA11 |
| Product Type | Auxiliary Switch Block |
| Number of Contacts | 2 |
| Contact Configuration | 2NO (2 Normally Open) |
| Mounting Type | Plug-in (Snap-on) |
| Compatible Contactors | 3RT1 (S00, S0, S2, S3), 3RT2 (S00, S0) |
| Rated Insulation Voltage (Ui) | 690 V |
| Surge Voltage Resistance (Uimp) | 6 kV |
| Rated Current Ie AC-15 @24V | 10 A |
| Rated Current Ie AC-15 @110V | 10 A |
| Rated Current Ie AC-15 @230V | 6 A |
| Rated Current Ie AC-15 @240V | 6 A |
| Rated Current Ie AC-15 @400V | 3 A |
| Rated Current Ie DC-13 @24V | 10 A |
| Rated Current Ie DC-13 @110V | 0.9 A |
| Rated Current Ie DC-13 @220V | 0.45 A |
| Short-circuit Protection | 10 A gG/gL fuse recommended |
| Overvoltage Category | III |
| Utilization Category | AC-15 / DC-13 |
| Switching Frequency (Mechanical) | Up to 3,600 cycles/hour |
| Connection Technology | Screw terminals |
| Width | ~45 mm |
| Net Weight | ~43 g |
| Degree of Protection | IP20 |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -55°C to +80°C |
| Max Installation Altitude | 2,000 m (without derating) |
| Standards | IEC 60947-5-1, EN 60947-5-1 |
| GTIN/UPC | 4011209026170 |
