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Specification & Description
The Siemens 3RB3123-4SB0 is a state-of-the-art solid-state overload relay designed for motor protection. This compact device is part of the SIRIUS product family and is engineered to provide reliable protection for motors in a range of industrial applications. With an adjustable current response value ranging from 3 to 12 A, it ensures optimal protection for various motor sizes.
The 3RB3123-4SB0 is suitable for use with contactors of size S0 and is capable of handling a thermal current of up to 12 A. It boasts a manual-automatic-reset feature and includes an internal ground fault detection system for enhanced safety. The overload relay is designed for contactor mounting, with both the main and auxiliary circuits utilising screw-type terminals for secure and straightforward connections.
Constructed to withstand challenging industrial environments, the 3RB3123-4SB0 operates effectively within an ambient temperature range of -25 to +60 °C and can be installed at altitudes up to 2000 metres above sea level without derating. It also features a robust design that is resistant to shock and vibration, ensuring consistent performance and longevity.
The device is compliant with EMC standards and is suitable for use in hazardous locations, as indicated by its ATEX certification. The front of the relay is IP20 rated, offering a degree of protection against solid objects and ensuring touch safety.
With its combination of advanced protection features, robust construction, and compliance with industry standards, the Siemens 3RB3123-4SB0 is an essential component for safeguarding motors and maintaining operational efficiency in a variety of industrial settings.
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Frequently Asked Questions
What is the function of this overload relay?
The overload relay is designed to protect motors from overcurrent situations, ensuring safe operation by tripping the circuit when current exceeds a preset level.
Can this overload relay be combined with any size of contactor?
It is specifically designed to be combined with a size S0 contactor, providing a compact and efficient motor protection solution.
What are the mounting options for this relay?
The relay offers flexible mounting options and can be mounted in any position, although it is typically used for contactor mounting.
What type of connections does this overload relay support?
It supports screw-type terminals for both the main current circuit and the auxiliary and control current circuit, facilitating secure and reliable connections.
Is there a manual reset function available on this relay?
Yes, the relay comes with a manual reset function, as well as options for automatic reset and remote reset capabilities.
What is the insulation voltage rating for this relay?
The insulation voltage with a degree of pollution 3 is rated at 690 V, providing a robust insulation level for various applications.
What is the operating temperature range for this relay?
The operating temperature range for this relay is from -25 to +60 degrees Celsius, ensuring reliable performance in a wide range of environmental conditions.
Does this relay have any certifications for use in hazardous locations?
Yes, it has been approved for use in hazardous locations, meeting the necessary standards for safety in such environments.
What is the trip class of this overload relay?
The trip class of the relay is adjustable and can be set to CLASS 5E, 10E, 20E, or 30E, providing versatility for different motor protection requirements.
How does this relay contribute to motor protection?
By monitoring the motor current and tripping to prevent damage when an overload is detected, the relay plays a crucial role in preventing motor burnout and extending the lifespan of the motor.
Part conditions explained
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New unsealed: The product is in its original packaging, but the packaging has been opened or unsealed. It has never been used and should be in near pristine condition.
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Used: The product has been previously owned and has been used. It may show signs of wear and tear but is still functional and operational. The condition may vary depending on the specific item and its usage history.
