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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-1EA11 |
| Alternative Part Number | 3RH19211EA11 |
| Manufacturer | Siemens |
| Product Type | Auxiliary Switch Block |
| Contact Configuration | 1 Normally Open (NO) / 1 Normally Closed (NC) |
| Rated Voltage | 440 V |
| Insulation Voltage | 500 V with degree of pollution 3 |
| Surge Voltage Resistance | 6 kV rated value |
| Ambient Operating Temperature Range | -25 ... +60 °C during operation, -55 ... +80 °C during storage |
| Mechanical Service Life | Typical 10,000,000 switching cycles |
| Electrical Endurance | 200,000 switching cycles at AC-15, 230 V typical |
| Contact Reliability | 1 faulty switching per 100 million (17 V, 1 mA) |
| Mounting Type | Snap-on mounting |
| Dimensions (W x H x D) | 10 mm x 80 mm x 71 mm |
| Connection Type | Screw-type terminals |
| Conductor Cross-section | For auxiliary contacts: 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) solid or finely stranded |
| Protection Class | IP20 on the front |
| Compliance | Mirror contact acc. to IEC 60947-4-1, positively driven operation acc. to IEC 60947-5-1 (No) |
| Application | Suitable for use with contactor relays and power contactors |
The Siemens 3RH1921-1EA11 is a high-quality auxiliary switch block designed to complement contactor setups in a variety of industrial applications. This switch block features a single normally open (NO) and a single normally closed (NC) contact, making it a versatile choice for enhancing control circuit flexibility. Engineered for lateral mounting, it seamlessly integrates with size S0 to S12 contactors, particularly those within the 3RT1 range.
Constructed to meet the rigorous standards of the SIRIUS product line, the 3RH1921-1EA11 boasts an IP20 protection class on the front, ensuring it is safeguarded against solid objects larger than 12.5mm. Its robust design allows it to operate reliably within an ambient temperature range of -25 to +60 degrees Celsius, and it maintains performance during storage in temperatures from -55 to +80 degrees Celsius.
The switch block is notable for its mechanical service life, offering approximately 10 million switching cycles, and an electrical endurance of 200,000 cycles at AC-15 at 230V, which speaks to its durability and longevity in demanding environments. The contact reliability is exceptional, with a very low chance of incorrect switching operations, ensuring consistent performance.
Installation is straightforward with its snap-on mounting design, and it has a compact footprint with dimensions of 10mm in width, 80mm in height, and 71mm in depth. The screw-type terminals provide a secure and reliable electrical connection, accommodating a range of conductor cross-sections for auxiliary contacts.
The 3RH1921-1EA11 is equipped with safety-related features such as a mirror contact according to IEC 60947-4-1, although it does not support positively driven operation according to IEC 60947-5-1. This auxiliary switch block is a testament to Siemens' commitment to quality, reliability, and innovation in industrial control components.
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Frequently Asked Questions
What is the function of this auxiliary switch block?
The auxiliary switch block is designed to provide additional switching functions for contactor relays and power contactors. It features one normally open (NO) and one normally closed (NC) contact, which can be used for various control and signalling functions in electrical circuits.
Can this auxiliary switch block be used with any contactor?
This auxiliary switch block is specifically designed for use with Siemens 3RT1 contactors. It may not be compatible with contactors from other manufacturers or different series.
What is the voltage rating for this auxiliary switch block?
The auxiliary switch block is rated for use at up to 440 V.
What are the ambient temperature limits for operating this auxiliary switch block?
The auxiliary switch block can operate within an ambient temperature range of -25 to +60 °C during operation, and it can be stored in temperatures ranging from -55 to +80 °C.
What is the mechanical service life of this auxiliary switch block?
The mechanical service life of the auxiliary switch block is typically around 10 million switching cycles.
What type of terminals does this auxiliary switch block have for connection?
The auxiliary switch block comes with screw-type terminals for secure and reliable electrical connections.
Does this auxiliary switch block have a mirror contact function?
Yes, the auxiliary switch block has a mirror contact function according to IEC 60947-4-1 when used with 3RT1 contactors.
What is the insulation voltage rating for this auxiliary switch block?
The insulation voltage rating for the auxiliary switch block, with a degree of pollution 3, is 500 V AC.
What is the surge voltage resistance of this auxiliary switch block?
The surge voltage resistance of the auxiliary switch block is rated at 6 kV.
How is this auxiliary switch block mounted?
The auxiliary switch block is designed for snap-on mounting, making it easy to install alongside compatible contactors.
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