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Siemens 3RB3123-4RB0 Electronic Overload Relay, 0.1-0.4A, Size S0

Siemens 3RB3123-4RB0 Electronic Overload Relay

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ManufacturerSiemens

Part number3RB3123-4RB0

Current Range 0.1-0.4 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 3RB3123-4RB0 is an electronic overload relay designed for precise motor protection in size S0 applications. It features a low adjustable current range of 0.1 to 0.4 A, suitable for smaller motors, and mounts directly onto Siemens 3RT contactors. This relay offers critical protection against overloads and phase failures, with selectable trip classes (5E to 30E) to ensure optimal motor performance and longevity.

This overload relay is ideal for protecting smaller motors in applications such as small pumps, fans, and auxiliary equipment in manufacturing and automation systems. Its electronic design ensures consistent and accurate tripping, safeguarding sensitive motor components from damage.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, is your reliable source for the Siemens 3RB3123-4RB0. We provide quality components at competitive prices, backed by fast shipping and excellent customer support. Partner with Stanlo Automation for your essential industrial parts needs.

Technical specifications

Current Range	0.1-0.4 A
Size	S0
Trip Class	5E-30E
Mounting	Contactor Mounting
Reset	Manual-Automatic
Features	Phase-failure sensitivity, Internal ground fault detection

Common applications

Small Motor Protection

Pump Controls

Fan Systems

Auxiliary Equipment

Manufacturing Automation

Compatible systems

Siemens 3RT contactors (Size S0) Small motor control circuits

Also known as

Siemens 3RB3123-4RB0 overload relay Siemens 0.1-0.4A Size S0 overload relay SIRIUS 3RB3123 electronic relay

Replaces / compatible with

This overload relay is intended for use with Siemens 3RT contactors of Size S0, offering precise electronic protection for smaller motors.

Technical note

Expert tip

Ensure accurate selection of the trip class (5E-30E) based on the motor's starting current and duty cycle to prevent nuisance tripping or inadequate protection. This unit is designed for direct mounting onto compatible Size S0 Siemens 3RT contactors.

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Frequently asked questions

Can the Siemens 3RB3123-4RB0 overload relay be used for smaller motor applications?

Yes, the Siemens 3RB3123-4RB0 is specifically designed for smaller motor applications with its adjustable current range of 0.1 to 0.4 A. It provides accurate and reliable protection for these motors within Size S0 systems.