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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH1921-2HA31 |
| Alternative Part Number | 3RH19212HA31 |
| Manufacturer | Siemens |
| Product Type | Auxiliary Switch Block |
| Mounting Type | Snap-On Mounting |
| Number of Contacts | 4 (3NO+1NC) |
| Connection Type | Cage Clamp Connection |
| Suitable For | Contactors for Switching Motors |
| Protection Class IP | IP20 |
| Ambient Operating Temperature Range | -25 … +60 °C |
| Storage Temperature Range | -55 … +80 °C |
| Mechanical Operating Cycles | Typically 10,000,000 |
| Electrical Operating Cycles at AC-15 | Typically 200,000 at 230 V |
| Contact Reliability | 1 faulty switching per 100 million (17 V, 1 mA) |
| Insulation Voltage | Rated value 690 V |
| Impulse Voltage Resistance | Rated value 6 kV |
| Operating Current at AC-12 | 10 A at 24 V and 230 V |
| Operating Current at AC-15 | 6 A at 24 V and 230 V, 3 A at 400 V, 1 A at 690 V |
| Operating Current at DC-13 | 6 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V |
| Dimensions (W x H x D) | 44 x 38 x 51 mm |
| Electrical Connection | Spring-loaded terminals for auxiliary and control current circuit |
| Conductor Cross-Section | 2x (0.5 ... 1.5 mm²) finely stranded with conductor end processing, 2x (0.5 ... 2.5 mm²) without |
| AWG Conductors | 2x (20 ... 14) for auxiliary contacts |
| Product Function | Mirror contact to IEC 60947-4-1 with 3RT1, Not positively driven to IEC 60947-5-1 |
| Commodity Code | 85365080 |
The Siemens 3RH Series Auxiliary Switch is a compact and reliable snap-on mount switch block designed for seamless integration with contactors used in motor switching applications. This auxiliary switch block features a configuration of 3 normally open (NO) and 1 normally closed (NC) contacts, conforming to DIN EN50005 standards. With a cage clamp connection, it ensures a secure and maintenance-free electrical connection.
Crafted for durability, the switch block can withstand a wide range of ambient temperatures from -25°C to +60°C during operation, making it suitable for various industrial environments. It boasts an impressive mechanical operating cycle of typically 10 million operations and an electrical operating cycle of 200,000 at AC-15, at 230V.
The 3RH1921-2HA31 auxiliary switch block is rated for an insulation voltage of 690V with a pollution degree of 3 and has an impulse voltage resistance of 6kV, ensuring robust performance in demanding electrical conditions. Its auxiliary circuit can handle currents up to 10A at 24V, with varying ratings up to 600V.
With dimensions of 44mm in width, 38mm in height, and 51mm in depth, this auxiliary switch block is designed for space-saving installation while providing easy access for wiring through its spring-loaded terminals. It is compatible with finely stranded wires with or without conductor end processing, accommodating a range of conductor cross-sections.
The Siemens 3RH1921-2HA31 is also equipped with a mirror contact feature as per IEC 60947-4-1 standards when used with 3RT1 contactors, although it does not support positively driven operation to IEC 60947-5-1. This auxiliary switch block is a testament to Siemens' commitment to quality, offering a reliable solution for enhancing control circuit functionalities in industrial applications.
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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 contactors for switching motors, providing additional switching functions such as signalling the contactor's position.
Can this auxiliary switch block be mounted easily?
Yes, it features snap-on mounting for easy and secure attachment to compatible devices.
What type of connections does this auxiliary switch block support?
It supports spring-loaded terminals for auxiliary and control current circuits, allowing for quick and reliable connections.
What is the ambient operating temperature range for this auxiliary switch block?
The ambient operating temperature range is from -25°C to +60°C, ensuring reliable operation in various environmental conditions.
How many mechanical operating cycles can this auxiliary switch block withstand?
It is designed for typically 10,000,000 mechanical operating cycles, indicating a high level of durability and longevity.
What is the insulation voltage rating for this auxiliary switch block?
The insulation voltage rating with degree of pollution 3 is 690V, providing a high level of electrical insulation.
Does this auxiliary switch block have a mirror contact function?
Yes, it includes a mirror contact function 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 is rated at 6kV, offering protection against voltage spikes.
What are the dimensions of this auxiliary switch block?
The dimensions are 44mm in width, 38mm in height, and 51mm in depth, making it compact and suitable for various applications.
How many auxiliary contacts does this switch block have?
It has 3 normally open (NO) contacts and 1 normally closed (NC) contact, providing flexibility in circuit design.
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