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Siemens 3RB3123-4QB0 Electronic Overload Relay, 6-25A, Size S0

Siemens 3RB3123-4QB0 Electronic Overload Relay

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ManufacturerSiemens

Part number3RB3123-4QB0

Current Range 6-25 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 3RB3123-4QB0 is a high-performance electronic overload relay designed for motor protection in size S0 applications. It features an adjustable current range of 6 to 25 A and is intended for direct mounting onto Siemens 3RT contactors. This relay provides essential protection against overloads and phase unbalance, with selectable trip classes from 5E to 30E for tailored motor safeguarding.

This overload relay is widely used in industrial settings for motor control in applications such as heavy-duty machinery, material handling systems, and processing equipment. Its robust electronic design ensures reliable operation and precise tripping, minimizing downtime and preventing costly motor damage.

Stanlo Automation, your trusted veteran-owned source for industrial automation surplus, proudly offers the Siemens 3RB3123-4QB0. We are dedicated to providing high-quality, cost-effective solutions to keep your operations running. Count on Stanlo Automation for your Siemens component needs and benefit from our expertise and commitment to customer satisfaction.

Technical specifications

Current Range	6-25 A
Size	S0
Trip Class	5E-30E
Mounting	Contactor Mounting
Reset	Manual-Automatic
Features	Phase-failure sensitivity, Internal ground fault detection

Common applications

Heavy Machinery

Material Handling

Industrial Processing

Motor Control Centers

Manufacturing Automation

Compatible systems

Siemens 3RT contactors (Size S0) Industrial control panels

Also known as

Siemens 3RB3123-4QB0 overload relay Siemens 6-25A Size S0 overload relay SIRIUS 3RB3123 electronic relay

Replaces / compatible with

This overload relay is designed to replace or upgrade older Siemens overload relays used with Size S0 3RT contactors, offering enhanced electronic protection capabilities.

Technical note

Expert tip

For applications requiring external reset or signaling, ensure the auxiliary contacts are correctly wired according to the device's manual. This unit is designed for direct coupling with Size S0 Siemens 3RT contactors.

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Frequently asked questions

What type of fault detection is included in the Siemens 3RB3123-4QB0 overload relay?

The Siemens 3RB3123-4QB0 overload relay includes internal ground fault detection in addition to standard overload and phase-failure sensitivity. This provides a more comprehensive layer of protection for the motor circuit.