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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-1CD01 |
| Alternative Part Number | 3RH19211CD01 |
| Manufacturer | Siemens |
| Product Type | Auxiliary Switch Block |
| Number of Contacts | 1 Normally Closed (NC), Delayed |
| Connection Type | Screw Connection |
| Suitable Applications | For Motor Contactors, 1-Pole |
| Mounting Type | Snap-on Mounting |
| Width | 10 mm |
| Height | 38 mm |
| Depth | 51 mm |
| Insulation Voltage | Rated at 690 V with degree of pollution 3 |
| Impulse Voltage Resistance | Rated at 6 kV |
| Ambient Operating Temperature Range | -25 to +60 °C during operation, -55 to +80 °C during storage |
| Mechanical Operating Cycles | Typically 10,000,000 |
| Electrical Operating Cycles | Typically 200,000 at AC-15, at 230 V |
| Contact Reliability | 1 faulty switching per 100 million (17 V, 1 mA) |
| Protection Class | IP20 on the front |
| Auxiliary Circuit Current Ratings | Varies with voltage level, up to 10 A at 24 V for AC-12, and 6 A at 24 V for DC-13 |
| Product Approvals | General Product Approval, Functional Safety/Safety of Machinery, KC Type Examination Certificate |
The Siemens 3RH1921-1CD01 is a high-quality auxiliary switch block designed to enhance the functionality of motor contactors. This component is part of the esteemed SIRIUS product line, known for its reliability and versatility in various industrial applications. The switch block features a single normally closed (NC) contact, configured according to the DIN EN50005 standard, and is equipped with a screw connection for secure and straightforward installation.
Engineered to operate within a broad ambient temperature range, the 3RH1921-1CD01 can withstand conditions from -25°C to +60°C during operation, ensuring consistent performance even in demanding environments. Its mechanical service life is impressive, with up to 10 million operating cycles, and it offers an electrical endurance of 200,000 cycles at AC-15 at 230V, highlighting its durability and long-term reliability.
The auxiliary switch block boasts an insulation voltage rated at 690V with a degree of pollution 3, and a surge voltage resistance of 6kV, providing robust protection against electrical disturbances. The compact design, featuring snap-on mounting, allows for easy integration into existing setups, with dimensions of 10mm in width, 38mm in height, and 51mm in depth.
This component is particularly suitable for use with contactor relays and power contactors, enhancing their switching capabilities and contributing to the overall safety and efficiency of the electrical control system. The 3RH1921-1CD01 is a testament to Siemens' commitment to quality and innovation, offering a dependable solution for industrial control applications.
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 an additional NC (normally closed) contact for motor contactors, enhancing control and feedback within a circuit.
Can this auxiliary switch block be used with any contactor?
It is specifically designed for use with Siemens 3RT1 contactors, ensuring compatibility and reliable operation.
What are the mounting requirements for this auxiliary switch block?
This auxiliary switch block is designed for snap-on mounting, which allows for quick and easy installation onto compatible contactors.
What is the protection class of this auxiliary switch block?
The protection class for the front of the auxiliary switch block is IP20, indicating a basic level of protection against solid objects.
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, and can be stored in temperatures ranging from -55 to +80 degrees Celsius.
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, indicating its durability and longevity.
What is the electrical endurance of the auxiliary switch block?
The electrical endurance of the auxiliary switch block is typically 200,000 switching cycles at AC-15 at 230V.
How reliable are the contacts within this auxiliary switch block?
The contacts within the auxiliary switch block are highly reliable, with a contact reliability of 1 faulty switching per 100 million operations at 17V, 1 mA.
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 690V.
What type of electrical connection does this auxiliary switch block support?
The auxiliary switch block supports screw-type terminals for electrical connections, accommodating various conductor cross-sections for auxiliary contacts.
Part conditions explained
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