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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-1EA20 |
| Alternative Part Number | 3RH19211EA20 |
| Manufacturer | Siemens |
| Product Type | Auxiliary Switch Block |
| Mounting Type | Snap On Mount |
| Number of Contacts | 2 Normally Open (NO) |
| Rated Insulation Voltage | 500 V |
| Protection Class | IP20 |
| Ambient Operating Temperature | -25 ... +60 °C |
| 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) |
| Surge Voltage Resistance | Rated value 6 kV |
| Suitability for Use | Contactor relay and power contactor |
| Storage Temperature Range | -55 ... +80 °C |
The Siemens 3RH1921-1EA20 is a high-quality auxiliary switch block designed to enhance the functionality of contactor relays and power contactors. This component is engineered to be compatible with a range of motor contactors from sizes S0 to S12. It features two normally open (NO) contacts, which are crucial for various control and signalling functions within electrical circuits.
Crafted with precision, the 3RH1921-1EA20 boasts an IP20 protection class on the front, ensuring that it is safeguarded against solid objects larger than 12.5mm but not against water. This makes it suitable for use in environments where it is not exposed to moisture. The auxiliary switch block operates reliably within an ambient temperature range of -25 to +60 degrees Celsius, making it versatile for different working conditions.
The mechanical service life of this component is typically 10 million switching cycles, and it has an electrical endurance of 200,000 cycles at AC-15 at 230V, which speaks to its durability and longevity. The switch block is designed with a snap-on mounting type, which allows for quick and easy installation onto the contactor. It measures 10mm in width, 80mm in height, and 71mm in depth, making it a compact addition to your electrical setup.
The 3RH1921-1EA20 is equipped with screw-type terminals for secure and reliable electrical connections. It can accommodate a range of conductor cross-sections, both solid and finely stranded, with or without core end processing. This flexibility ensures that it can be integrated seamlessly into various electrical systems.
This auxiliary switch block is a testament to Siemens' commitment to quality and reliability in electrical components. It is a valuable asset for enhancing control operations within industrial and commercial electrical systems.
Commonly Asked Questions
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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 when mounted onto a contactor or relay. It offers two normally open (NO) contacts that can be used for various control and signalling functions in an electrical circuit.
Can this auxiliary switch block be used with any size of contactor?
This auxiliary switch block is suitable for use with contactors ranging from size S0 to S12, ensuring compatibility with a wide range of motor contactors.
What type of terminals does this auxiliary switch block have?
The auxiliary switch block comes with screw-type terminals, which provide a secure and reliable connection for auxiliary and control current circuits.
What is the insulation voltage rating for this auxiliary switch block?
The insulation voltage rating with a degree of pollution 3 for this auxiliary switch block is rated at 500 V.
What is the surge voltage resistance of this auxiliary switch block?
The surge voltage resistance of this auxiliary switch block is rated at 6 kV.
What is the mechanical service life of this auxiliary switch block?
The mechanical service life of this auxiliary switch block is typically 10 million switching cycles, indicating its durability and longevity.
What is the electrical endurance of this auxiliary switch block at AC-15, 230 V?
At AC-15, 230 V, the electrical endurance of this auxiliary switch block is typically 200,000 switching cycles.
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, and can be stored in temperatures ranging from -55 to +80 °C.
How is this auxiliary switch block mounted?
This auxiliary switch block is designed for snap-on mounting, which allows for quick and easy installation onto the side of a contactor or relay.
Does this auxiliary switch block have a mirror contact function?
Yes, this auxiliary switch block has a mirror contact function according to IEC 60947-4-1 when used with 3RT1 contactors, enhancing safety by ensuring that the NO and NC contacts cannot be closed at the same time.
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