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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-1MA11 |
| Alternative Part Number | 3RH19211MA11 |
| Manufacturer | Siemens |
| Product Type | Auxiliary Switch Block |
| Contact Configuration | 1 Normally Open (NO) + 1 Normally Closed (NC) |
| Rated Insulation Voltage | 690 V |
| Surge Voltage Resistance | Rated value 6 kV |
| Mechanical Service Life | Typical 10,000,000 switching cycles |
| Electrical Endurance | Typical 200,000 switching cycles at AC-15, 230 V |
| Contact Reliability | 1 faulty switching per 100 million operations (17 V, 1 mA) |
| Ambient Operating Temperature Range | -25 ... +60 °C during operation |
| Storage Temperature Range | -55 ... +80 °C |
| Protection Class | IP20 on the front |
| Mounting Type | Snap-on mounting |
| Connection Type | Screw-type terminals |
| Suitable For Use With | Contactor relay and power contactor |
| Dimensions (Width x Height x Depth) | 44 mm x 38 mm x 51 mm |
| Commodity Code | 85365080 |
The Siemens 3RH1921-1MA11 is a high-quality auxiliary switch block designed to enhance the functionality of motor contactors. This switch block is equipped with one normally open (NO) and one normally closed (NC) contact, conforming to EN 50005 standards for a 2-pole connection with a screw terminal. It is suitable for a wide range of industrial applications where reliable switching is essential.
Crafted for durability and performance, the 3RH1921-1MA11 boasts an impressive mechanical service life of approximately 10 million switching cycles, and an electrical endurance of 200,000 cycles at AC-15 at 230V, which speaks to its robustness and longevity in demanding environments.
The switch block operates within an ambient temperature range of -25 to +60°C during operation, ensuring consistent performance even in varied temperature conditions. With an insulation voltage rated at 690V and a surge voltage resistance of 6kV, it provides a high level of electrical insulation and protection against voltage spikes.
Installation is straightforward thanks to its snap-on mounting design, and it features a compact footprint with dimensions of 44mm in width, 38mm in height, and 51mm in depth, allowing for efficient use of space within control cabinets.
The 3RH1921-1MA11 is a testament to Siemens' commitment to quality and reliability, making it an excellent choice for those seeking to maintain or enhance their motor control systems with a dependable auxiliary switch block.
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Frequently Asked Questions
What is the voltage rating for this auxiliary switch block?
The auxiliary switch block is rated for an insulation voltage of up to 690 V, making it suitable for a wide range of industrial applications.
Can this auxiliary switch block be used with motor contactors?
Yes, this auxiliary switch block is designed for use with contactors for switching motors, providing reliable performance in controlling motor operations.
What type of terminals does this auxiliary switch block have?
The auxiliary switch block comes equipped with screw-type terminals, which offer a secure and reliable connection for auxiliary and control current circuits.
What is the IP protection class of this auxiliary switch block?
This auxiliary switch block has an IP20 protection class on the front, indicating that it is protected against solid objects larger than 12.5 mm but not against water.
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 degrees Celsius, ensuring functionality in various environmental conditions.
How many switching cycles can this auxiliary switch block handle?
The mechanical service life of the auxiliary switch block is typically around 10 million switching cycles, while its electrical endurance at AC-15 at 230 V is approximately 200,000 cycles.
What are the dimensions of this auxiliary switch block?
The dimensions of the auxiliary switch block are 44 mm in width, 38 mm in height, and 51 mm in depth, making it compact and easy to integrate into various setups.
Is the auxiliary switch block easy to install?
Yes, the auxiliary switch block features snap-on mounting, which simplifies the installation process and allows for quick and easy integration with existing systems.
Does this auxiliary switch block have mirror contact functionality?
The auxiliary switch block does include mirror contact functionality according to IEC 60947-4-1, when used with 3RT1 contactors, enhancing its safety features.
What is the contact reliability of the auxiliary switch block?
The auxiliary switch block boasts a high contact reliability, with only one faulty switching operation expected per 100 million operations at 17 V and 5 mA for the main contacts.
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