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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-1FA31 |
| Alternative Part Number | 3RH19211FA31 |
| Manufacturer | Siemens |
| Part Description | Siemens Auxiliary Contact Block 1NO/1NC 440 V |
| Short Description | Attachable block, 4-pole |
| Country of Origin | Not specified |
| Commodity Code | 319211 |
| Use | Auxiliary and power contactor |
| Protection | IP20 front side |
| Operating Temperature | -25 to +60 °C |
| Storage Temperature | -55 to +80 °C |
| Mechanical Life | Typically 10,000,000 switching cycles |
| Electrical Life | Typically 200,000 switching cycles at AC-15 at 230 V |
| Contact Reliability | One malfunction per 100 million (17 V, 5 mA) |
| Auxiliary Contact Reliability | One malfunction per 100 million (17 V, 1 mA) |
| Insulation Voltage | Rated value 690 V at pollution degree 3 |
| Shock Voltage Resistance | Rated value 6 kV |
| Auxiliary Circuit | 1 normally open (NO) contact, 3 normally closed (NC) contacts |
The Siemens 3RH1921-1FA31 is a robust and reliable auxiliary contact block designed for optimal performance in a variety of industrial applications. This 4-pole attachable block features 3 Normally Open (NO) and 1 Normally Closed (NC) contacts, conforming to EN 50005 standards. With an insulation voltage rated at 690V and a surge voltage resistance rated at 6kV, it ensures safe and efficient operation. The part is designed to withstand ambient temperatures ranging from -25 to +60 degrees Celsius during operation and -55 to +80 degrees Celsius during storage. It boasts a mechanical service life of 10 million switching cycles and an electrical endurance of 200,000 switching cycles at AC-15 at 230V. The Siemens 3RH1921-1FA31 auxiliary contact block is part of the renowned SIRIUS product line, known for its high-quality and durable components.
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Frequently Asked Questions
What is the function of this Siemens Auxiliary Contact Block?
The Siemens 3RH1921-1FA31 is an attachable block that is used as an auxiliary contact block. It is designed to be used with contactor relays and power contactors. It helps in the control of electrical circuits by opening or closing an auxiliary circuit when the power contactor is energized or de-energized.
What are the technical specifications of this Auxiliary Contact Block?
This Siemens Auxiliary Contact Block operates at an insulation voltage of 690V with a surge voltage resistance of 6kV. It has a mechanical service life of approximately 10 million switching cycles and an electrical endurance of 200,000 switching cycles at AC-15 at 230V. It is designed to operate in 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 protection class of this part?
The Siemens 3RH1921-1FA31 Auxiliary Contact Block has a protection class IP20 on the front. This means it is protected against solid objects larger than 12.5mm but is not protected against liquids.
How many poles does this Auxiliary Contact Block have?
The Siemens 3RH1921-1FA31 is a 4-pole attachable block. It has 3 Normally Open (NO) contacts and 1 Normally Closed (NC) contact.
What is the reliability of the contacts in this Auxiliary Contact Block?
The Siemens 3RH1921-1FA31 has a high contact reliability. It is designed to have only one incorrect switching operation out of 100 million switching operations. This makes it a reliable choice for applications that require frequent switching.
