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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RH2122-1SB40 |
| Alternative Part Number | 3RH21221SB40 |
| Manufacturer | Siemens |
| Product Type | Coupling contactor relay |
| Contact Configuration | 2 Normally Closed (NC) + 2 Normally Open (NO) contacts |
| Control Supply Voltage | 24 V DC |
| Operating Range Factor | 0.85 to 1.85 times the rated value of the magnet coil at DC |
| Surge Suppressor | Integrated suppressor diode |
| Size | S00 |
| Terminal Type | Screw terminal |
| Insulation Voltage | Rated at 690 V AC with degree of pollution 3 |
| Degree of Pollution | 3 |
| Surge Voltage Resistance | Rated value 6 kV |
| Shock Resistance | 10g / 5 ms, 5g / 10 ms (rectangular impulse); 15g / 5 ms, 8g / 10 ms (sine pulse) at DC |
| Mechanical Service Life | Typical 30 million switching cycles |
| Ambient Operating Temperature | -25 to +60 °C during operation; -55 to +80 °C during storage |
| No-load Switching Frequency | 10,000 operations per hour at AC/DC |
| Closing Power of Magnet Coil | 1.6 W at DC |
| Holding Power of Magnet Coil | 1.6 W at DC |
| Closing Delay | 30 to 100 ms at DC |
| Opening Delay | 7 to 13 ms at DC |
| Arcing Time | 10 to 15 ms |
| Auxiliary Contacts | 2 NC instantaneous contacts + 2 NO instantaneous contacts |
| Operating Current at AC-12 | Maximum 10 A |
| Operating Current at AC-15 | 10 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V rated value |
| Operating Current at DC-12 | 10 A at 24 V, 3 A at 110 V rated value |
| Reference Code | According to IEC 81346-2: K |
| Installation Altitude | Up to 2,000 metres above sea level |
The Siemens 3RH2122-1SB40 is a coupling contactor relay designed for switching auxiliary circuits within a diverse range of applications. This compact and reliable component is part of the SIRIUS product family, renowned for its high-quality industrial control products. The relay features 2 normally closed (NC) and 2 normally open (NO) contacts, making it versatile for various control circuit configurations.
Engineered for DC operation, it has a rated control supply voltage of 24 V DC and includes an integrated suppressor diode to protect against voltage spikes. The device is characterised by its size S00 screw terminal, facilitating easy and secure connections. With an insulation voltage rated at 690 V and a surge voltage resistance of 6 kV, it ensures robust performance even in environments with a high degree of electrical pollution.
The 3RH2122-1SB40 is designed to withstand demanding conditions, with an ambient operating temperature range of -25 to +60 °C and a storage temperature range of -55 to +80 °C. It boasts a mechanical service life of typically 30 million switching cycles, indicating its durability and longevity in continuous use.
This relay is suitable for a no-load switching frequency of 10,000 operations per hour for both AC and DC, demonstrating its capability to handle high-frequency operations. The control circuit includes a closing delay of 30 to 100 ms and an opening delay of 7 to 13 ms, ensuring precise control over switching actions.
The 3RH2122-1SB40 is a testament to Siemens' commitment to quality and reliability, making it an excellent choice for industrial applications that require a dependable solution for controlling auxiliary circuits.
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Frequently Asked Questions
What type of device is this?
This is a coupling contactor relay designed for switching auxiliary circuits in industrial applications.
Can you describe the contact configuration?
The contactor relay has a configuration of 2 normally closed (NC) and 2 normally open (NO) contacts.
What is the control supply voltage for this relay?
The control supply voltage for this relay is 24 V DC.
Is there any built-in surge protection?
Yes, the relay comes with an integrated suppressor diode for surge protection.
What is the size of this contactor?
The contactor is of size S00, which is a compact size for use in various applications.
What are the operating and storage temperature ranges for this relay?
The operating temperature range is from -25°C to +60°C, and the storage temperature range is from -55°C to +80°C.
What is the mechanical service life of the relay?
The mechanical service life of the relay is typically around 30 million switching cycles.
What is the insulation voltage rating for this device?
The insulation voltage rating with a degree of pollution 3 is 690 V.
How is the relay protected against shock and vibration?
The relay is designed to withstand shock resistance at rectangular impulse and sine pulse at specified g forces and durations, ensuring durability in industrial environments.
What certifications does this relay have?
The relay has general product approvals and may have additional certifications such as KC, Type Examination Certificate, and others relevant to its use in industrial applications.
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