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Siemens 3RB3143-4XW1 Electronic Overload Relay - Size S3

Siemens 3RB3143-4XW1 electronic overload relay for heavy-duty motor protection.

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ManufacturerSiemens

Part number3RB3143-4XW1

Current Range 32-115 A

Size S3

Trip Class 5E-30E

Reset Manual/Automatic

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CAGE: 9NK75

High current capacity overload relay Electronic motor protection Adjustable trip settings Manual and automatic reset Robust design for industrial use

Product description

The Siemens 3RB3143-4XW1 is an electronic overload relay designed for robust motor protection in demanding applications. It covers a wide current range from 32 to 115 Amps and is categorized under Size S3, with a trip class of 5E to 30E. This relay is engineered for stand-alone installation and features a straight-through transformer in the main circuit and screw terminals for the auxiliary connections. It supports both manual and automatic reset functionalities.

This overload relay is essential for safeguarding larger electric motors against overcurrent conditions, phase failures, and other electrical anomalies that can lead to damage. Its application spans across heavy-duty industrial settings, including large pump systems, industrial fans, heavy conveyors, and large-scale manufacturing equipment.

As a veteran-owned surplus parts distributor, Stanlo Automation proudly offers the Siemens 3RB3143-4XW1. We are dedicated to providing high-quality, reliable automation components, ensuring our customers can source critical parts with confidence and efficiency.

Technical specifications

Current Range	32-115 A
Size	S3
Trip Class	5E-30E
Reset	Manual/Automatic
Installation	Stand-alone
Main Circuit	Straight-through transformer
Auxiliary Circuit	Screw terminals

Common applications

Large motor protection

Heavy industrial machinery

Pump and fan stations

Material handling systems

Manufacturing plants

Compatible systems

Compatible with Siemens motor starters and control systems requiring overload protection up to 115A

Also known as

Siemens 3RB3143 XW1 relay 32-115A Siemens overload Sirius overload relay S3

Replaces / compatible with

This overload relay is suitable for protecting larger Siemens motor starters and can serve as a replacement for older or equivalent high-capacity overload protection devices.

Technical note

Expert tip

Ensure the selected trip class (5E-30E) is appropriate for the motor's starting characteristics and operating environment to prevent nuisance tripping or inadequate protection.

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Frequently asked questions

What is the maximum current rating for the Siemens 3RB3143-4XW1 overload relay?

The Siemens 3RB3143-4XW1 electronic overload relay is designed for higher current applications, with a maximum rating of 115 Amps. It offers reliable protection for motors within its specified range.