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Siemens 3RB3123-4SB0 Electronic Overload Relay, 3-12A, Size S0

Siemens 3RB3123-4SB0 Electronic Overload Relay

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ManufacturerSiemens

Part number3RB3123-4SB0

Current Range 3-12 A

Size S0

Trip Class 5E-30E

Mounting Contactor Mounting

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Electronic Overload Protection Adjustable Current Setting Contactor Mountable Manual/Automatic Reset Phase-Failure Sensitivity Internal Ground Fault Detection

Product description

The Siemens 3RB3123-4SB0 is a versatile electronic overload relay designed for motor protection in size S0 applications. It offers an adjustable current range of 3 to 12 A and is designed for direct mounting onto compatible Siemens 3RT contactors. This relay provides essential protection against overloads and phase failures, with selectable trip classes (5E to 30E) for customized motor safeguarding.

This overload relay is a standard component for motor control in various industrial machinery, HVAC systems, and material handling applications. Its electronic design ensures precise and reliable operation, protecting motors from damage due to electrical disturbances and overload conditions.

Stanlo Automation, a veteran-owned distributor specializing in surplus industrial automation parts, is your go-to source for the Siemens 3RB3123-4SB0. We offer quality components with competitive pricing and rapid delivery, ensuring your automation needs are met efficiently. Trust Stanlo Automation for reliable parts and exceptional service.

Technical specifications

Current Range	3-12 A
Size	S0
Trip Class	5E-30E
Mounting	Contactor Mounting
Reset	Manual-Automatic
Features	Phase-failure sensitivity, Internal ground fault detection

Common applications

Industrial Machinery

HVAC Systems

Material Handling

Conveyor Systems

Manufacturing Automation

Compatible systems

Siemens 3RT contactors (Size S0) Motor control circuits

Also known as

Siemens 3RB3123-4SB0 overload relay Siemens 3-12A Size S0 overload relay SIRIUS 3RB3123 electronic relay

Replaces / compatible with

This overload relay is designed to be used with Siemens 3RT contactors of Size S0, offering a reliable electronic solution for motor protection within this range.

Technical note

Expert tip

Ensure that the selected trip class (5E-30E) is appropriate for the motor's starting characteristics to prevent premature tripping during startup or failure to trip under sustained overload conditions. This unit is designed for direct mounting onto Siemens 3RT contactors of Size S0.

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Frequently asked questions

What is the primary function of the Siemens 3RB3123-4SB0 overload relay?

The primary function of the Siemens 3RB3123-4SB0 overload relay is to protect electric motors from damage caused by overloads, phase unbalance, and other electrical faults. It provides adjustable current settings and trip classes for tailored protection.