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Siemens 3RB3143-4UW1 Electronic Overload Relay - Size S3

Siemens 3RB3143-4UW1 electronic overload relay for motor protection.

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ManufacturerSiemens

Part number3RB3143-4UW1

Current Range 12.5-50 A

Size S3

Trip Class 5E-30E

Reset Manual/Automatic

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Electronic overload protection Adjustable current setting Manual and automatic reset Suitable for motor protection Stand-alone installation

Product description

The Siemens 3RB3143-4UW1 is an electronic overload relay designed for motor protection. It operates within a current range of 12.5 to 50 Amps and is part of the Size S3 class, with a trip class of 5E to 30E. This relay features stand-alone installation, a straight-through transformer for the main circuit, and screw terminals for the auxiliary circuit. It offers both manual and automatic reset options for versatile operation.

This overload relay is crucial for protecting electric motors from damage due to overcurrent, phase imbalance, or other electrical faults. It is commonly used in industrial applications such as pump control, fan systems, conveyor belts, and general machinery where reliable motor protection is essential.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RB3143-4UW1 with a commitment to quality and service. We provide a reliable source for essential automation components, ensuring your operations run smoothly with genuine parts at competitive prices.

Technical specifications

Current Range	12.5-50 A
Size	S3
Trip Class	5E-30E
Reset	Manual/Automatic
Installation	Stand-alone
Main Circuit	Straight-through transformer
Auxiliary Circuit	Screw terminals

Common applications

Motor control centers

Pump systems

Fan applications

Conveyor systems

Industrial machinery

Compatible systems

Suitable for use with Siemens Sirius motor starters and contactors

Also known as

Siemens 3RB3143 overload relay 3RB3143 electronic relay Siemens motor protection relay

Replaces / compatible with

This overload relay is designed to protect various Siemens motor control components and can be used in place of older or equivalent overload protection devices.

Technical note

Expert tip

Ensure proper wiring of both main and auxiliary circuits according to the Siemens manual for reliable operation and accurate tripping.

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Frequently asked questions

What is the current setting range for the Siemens 3RB3143-4UW1 overload relay?

The Siemens 3RB3143-4UW1 electronic overload relay has an adjustable current setting range of 12.5 to 50 Amps, providing flexible protection for motors within this capacity.