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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-2FA31 |
| Alternative Part Number | 3RH19212FA31 |
| Manufacturer | Siemens |
| Series | 3RH |
| Type | Auxiliary Switch |
| Mounting | Snap On Mount |
| Current Rating | 10 A |
| Dimensions | 44 x 44 x 40 mm |
| Number of Contacts | 4 (3 Normally Open, 1 Normally Closed) |
| Contact Type | Instantaneous Switching |
| Operating Voltage for AC-15 | At 230 V: 6 A |
| Operating Voltage for DC-13 | At 24 V: 10 A, At 220 V: 0.3 A |
| Mechanical Operating Cycles | Typically 10,000,000 |
| Electrical Operating Cycles | Typically 200,000 at AC-15, 230 V |
| Insulation Voltage | Rated at 690 V with degree of pollution 3 |
| Impulse Voltage Resistance | Rated at 6 kV |
| Ambient Operating Temperature | -25 to +60 °C during operation |
| Storage Temperature | -55 to +80 °C |
| Protection Class | IP20 on the front |
| Connection Type | Spring-loaded terminals |
| Conductor Cross-section | For auxiliary contacts: 2x (0.5 ... 1.5 mm²) with conductor end processing, 2x (0.5 ... 2.5 mm²) without |
| AWG Conductors | For auxiliary contacts: 2x (20 ... 14) |
| Product Function | Mirror contact to IEC 60947-4-1 (with 3RT1), Not positively driven to IEC 60947-5-1 |
The Siemens 3RH1921-2FA31 is a high-quality auxiliary switch block designed for seamless integration with contactor relays and power contactors within the S0 to S12 size range. This component is engineered to enhance the functionality of switching motors by providing additional switching capabilities. It features a snap-on mounting design for easy installation and a compact footprint with dimensions of 44 x 38 x 51 mm, ensuring it does not require excessive space within your control cabinet.
Constructed to deliver reliable performance, the 3RH1921-2FA31 auxiliary switch block boasts an impressive mechanical operating life of up to 10 million cycles and an electrical operating life of 200,000 cycles at AC-15, 230 V. It is equipped with 3 normally open (NO) contacts and 1 normally closed (NC) contact, which are capable of handling an operating current of up to 10 A at 24 V in AC-12 applications. The switch block also maintains a high level of contact reliability, with a very low chance of incorrect switching operations, ensuring consistent and dependable operation.
Safety is a priority with this auxiliary switch block, as it includes a mirror contact feature compliant with IEC 60947-4-1 when used with 3RT1 contactors. The device is also rated for an insulation voltage of 690 V with a degree of pollution 3, and an impulse voltage resistance rated at 6 kV, providing robust protection against electrical disturbances.
The 3RH1921-2FA31's electrical connections are designed with spring-loaded terminals, accommodating a range of conductor cross-sections for auxiliary contacts, ensuring secure and reliable connections. This auxiliary switch block is an essential component for those seeking to expand the control capabilities of their motor switching applications with a product that combines efficiency, reliability, and safety.
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Frequently Asked Questions
What is the function of this auxiliary switch block?
The auxiliary switch block is designed to be used with contactor relays and power contactors for switching motors. It provides additional switching contacts, typically for control and signalling functions within a circuit.
Can this auxiliary switch block be used in any specific environmental conditions?
Yes, it is suitable for operating in ambient temperatures ranging from -25°C to +60°C and can be stored in temperatures from -55°C to +80°C.
What are the electrical operating cycles of this auxiliary switch block?
The auxiliary switch block has an electrical operating life of typically 200,000 cycles at AC-15 at 230V.
What type of mounting does this auxiliary switch block support?
This auxiliary switch block supports snap-on mounting, making it easy to install or replace without the need for tools.
What are the dimensions of this auxiliary switch block?
The dimensions of the auxiliary switch block are 44mm in width, 38mm in height, and 51mm in depth.
What is the insulation voltage rating for this auxiliary switch block?
The insulation voltage rating for this auxiliary switch block, with a degree of pollution 3, is 690V.
Does this auxiliary switch block have a mirror contact feature?
Yes, it does have a mirror contact feature according to IEC 60947-4-1 when used with 3RT1 contactors.
What is the impulse voltage resistance of this auxiliary switch block?
The impulse voltage resistance of the auxiliary switch block is rated at 6kV.
What type of electrical connection does this auxiliary switch block use?
The auxiliary switch block uses spring-loaded terminals for the electrical connection.
How many mechanical operating cycles can this auxiliary switch block withstand?
The auxiliary switch block can withstand typically 10 million mechanical operating cycles.
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