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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-1MA20 |
| Alternative Part Number | 3RH19211MA20 |
| Manufacturer | Siemens |
| Product Brand Name | SIRIUS |
| Product Type | Auxiliary switch block |
| Number of NC Contacts | 2 |
| Number of NO Contacts | 0 |
| Contact Type | Instantaneous |
| Suitability for Use | Contactor relay and power contactor |
| Protection Class (IP) | IP20 |
| Ambient Temperature (Storage) | -55 ... +80 °C |
| Ambient Temperature (Operation) | -25 ... +60 °C |
| Mechanical Service Life | 10,000,000 switching cycles |
| Electrical Endurance (AC-15, 230V) | 200,000 switching cycles |
| Contact Reliability | 1 faulty switching per 100 million (17 V, 1 mA) |
| Insulation Voltage | 690 V (with degree of pollution 3) |
| Surge Voltage Resistance | 6 kV |
| Operational Current (AC-12, 24V) | 10 A |
| Operational Current (AC-12, 230V) | 10 A |
| Operational Current (AC-12, Max) | 10 A |
| Operational Current (AC-14, 125V) | 6 A |
| Operational Current (AC-14, 250V) | 6 A |
| Operational Current (AC-15, 24V) | 6 A |
| Operational Current (AC-15, 230V) | 6 A |
| Operational Current (AC-15, 400V) | 3 A |
| Operational Current (AC-15, 690V) | 1 A |
| Operational Current (DC-12, 24V) | 10 A |
| Operational Current (DC-12, 110V) | 3 A |
| Operational Current (DC-12, 220V) | 1 A |
| Fastening Method | Snap-on mounting |
| Width | 44 mm |
| Height | 38 mm |
| Depth | 51 mm |
| Electrical Connection Type | Screw-type terminals |
| Connectable Conductor Cross-Sections | Finely stranded with core end processing: 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| AWG Cables for Auxiliary Contacts | 2x (20 ... 16), 2x (18 ... 14) |
| Mirror Contact Function | Yes (acc. to IEC 60947-4-1) |
| Positively Driven Operation | No (acc. to IEC 60947-5-1) |
The Siemens 3RH1921-1MA20 is a high-quality auxiliary switch block designed to enhance the functionality of motor contactors. This robust component is part of the renowned SIRIUS series, known for its reliability and superior performance in industrial applications. The auxiliary switch block features two normally closed (NC) contacts, making it suitable for a variety of control and signalling tasks.
Engineered to meet EN 50005 standards, the 3RH1921-1MA20 offers a protection class of IP20 on the front, ensuring it is well-protected against dust and other small particles. It operates efficiently within a wide ambient temperature range, from -25°C to +60°C, and can be stored in temperatures as low as -55°C and as high as +80°C. This makes it ideal for use in diverse environmental conditions.
The auxiliary switch block boasts an impressive mechanical service life of up to 10 million switching cycles, and an electrical endurance of approximately 200,000 switching cycles at AC-15 at 230V. It is designed to handle operational currents of up to 10A at 24V and 230V for AC-12 applications, and up to 6A at 230V for AC-15 applications. Additionally, it can manage operational currents at various DC voltages, ensuring versatility in different electrical setups.
Installation is straightforward with its snap-on mounting method, and it features screw-type terminals for secure electrical connections. The compact dimensions of 44mm in width, 38mm in height, and 51mm in depth make it easy to integrate into existing systems without requiring significant space.
The Siemens 3RH1921-1MA20 auxiliary switch block is a reliable and efficient solution for enhancing the control capabilities of motor contactors, providing long-lasting performance and adaptability in a wide range of industrial applications.
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Frequently Asked Questions
What is the primary function of this auxiliary switch block?
The primary function of this auxiliary switch block is to provide additional contacts for motor contactors, enhancing their control capabilities.
What type of contacts does this auxiliary switch block have?
This auxiliary switch block is equipped with 2 normally closed (NC) contacts.
What is the protection class rating for this auxiliary switch block?
The protection class rating for this auxiliary switch block is IP20 on the front.
What is the typical mechanical service life of this auxiliary switch block?
The typical mechanical service life of this auxiliary switch block is 10 million switching cycles.
What is the rated insulation voltage for this auxiliary switch block?
The rated insulation voltage for this auxiliary switch block, with a degree of pollution 3, is 690 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 operational current of the auxiliary contacts at 230 V AC-15?
The operational current of the auxiliary contacts at 230 V AC-15 is 6 A.
What are the ambient temperature ranges for storage and operation?
The ambient temperature range for storage is -55 to +80 °C, and for operation, it is -25 to +60 °C.
What type of mounting method is used for this auxiliary switch block?
This auxiliary switch block uses a snap-on mounting method.
What are the dimensions of this auxiliary switch block?
The dimensions of this auxiliary switch block are 44 mm in width, 38 mm in height, and 51 mm in depth.
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