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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-2CA10 |
| Alternative Part Number | 3RH19212CA10 |
| Manufacturer | Siemens |
| Product Type | Auxiliary Switch Block |
| Suitable Applications | Contactor relay and power contactor |
| Number of Contacts | 1 Normally Open (NO) |
| Rated Insulation Voltage | 690 V |
| Impulse Voltage Resistance | 6 kV |
| Ambient Operating Temperature Range | -25 °C to +60 °C during operation, -55 °C to +80 °C during storage |
| Mechanical Operating Cycles | Typically 10,000,000 |
| Electrical Operating Cycles | Typically 200,000 at AC-15, 230 V |
| Contact Reliability | 1 faulty switching per 100 million (17 V, 1 mA) for auxiliary contacts |
| Mounting Type | Snap-on mounting |
| Dimensions (W x H x D) | 10 mm x 38 mm x 51 mm |
| Connection Type | Spring-loaded terminals |
| Connectable Conductor Cross-section | 2x (0.5 ... 1.5 mm²) finely stranded with conductor end processing, 2x (0.5 ... 2.5 mm²) without |
| AWG Cable Compatibility | For auxiliary contacts: 2x (20 ... 14) |
| Product Function | Mirror contact according to IEC 60947-4-1 (with 3RT1) |
| Safety | Not positively driven according to IEC 60947-5-1 |
| Commodity Code | 85365080 |
The Siemens 3RH1921 Series Auxiliary Switch Block is a compact and reliable component designed for seamless integration with contactors used in motor switching applications. This auxiliary switch block features a single normally open (NO) contact, ensuring straightforward connectivity and functionality within your control systems. With a robust cage clamp connection, it offers a secure and maintenance-free electrical connection, enhancing the durability and longevity of the device.
Crafted to meet the DIN EN50005 standard, this switch block is engineered for precision and consistency in performance. The dimensions of 38 x 10 x 51 mm make it an ideal choice for installations where space is at a premium, without compromising on accessibility or ease of use.
The switch block operates efficiently within a wide ambient temperature range, from -25°C to +60°C, making it suitable for a variety of industrial environments. Its mechanical operating cycles are rated typically at 10,000,000, and it has an electrical operating cycle of 200,000 at AC-15, 230 V, which speaks to its resilience and reliability in demanding operational conditions.
With an insulation voltage rated at 690 V and an impulse voltage resistance of 6 kV, the Siemens 3RH1921 Series Auxiliary Switch Block is designed to withstand challenging electrical environments, ensuring safety and reliability in your electrical control systems. Its snap-on mounting design allows for quick and easy installation, making it a convenient addition to your equipment.
This auxiliary switch block is a testament to Siemens' commitment to quality and innovation, providing a dependable solution for enhancing the control and functionality of motor contactors. Whether you're upgrading existing systems or building new industrial controls, this auxiliary switch block is an excellent choice for ensuring efficient and reliable operations.
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Frequently Asked Questions
What is the function of an auxiliary switch block?
An auxiliary switch block is used to provide additional switching functions in a control circuit. It can be used for signalling, interlocking, or controlling auxiliary circuits separate from the main circuit.
Can this auxiliary switch block be used with any contactor?
The Siemens 3RH1921-2CA10 is designed to be compatible with specific Siemens contactors, particularly those in the 3RT1 range. It's important to check the compatibility with your existing contactor before purchasing.
What type of connections does this auxiliary switch block support?
This auxiliary switch block supports cage clamp connections, which are a type of screwless terminal that uses a spring to clamp the conductor, making it easy to install and providing a secure connection.
What is the voltage rating for this auxiliary switch block?
The voltage rating for this auxiliary switch block is up to 690 V, making it suitable for a wide range of industrial applications.
What are the dimensions of this auxiliary switch block?
The dimensions of the Siemens 3RH1921-2CA10 are 38 mm in height, 10 mm in width, and 51 mm in depth.
How many mechanical operating cycles can this auxiliary switch block handle?
This auxiliary switch block is designed for a mechanical operating life of typically 10 million cycles, ensuring long-term reliability in your control systems.
What is the insulation voltage and impulse voltage resistance of this part?
The insulation voltage with a degree of pollution 3 is rated at 690 V, and it has an impulse voltage resistance rated value of 6 kV.
What is the ambient temperature range for operating this auxiliary switch block?
The ambient temperature range for operating the auxiliary switch block is between -25 °C and +60 °C, ensuring it can function in a variety of industrial environments.
How is this auxiliary switch block mounted?
The auxiliary switch block is designed for snap-on mounting, which allows for quick and easy installation onto compatible contactors.
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, which is important for safety applications.
