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Siemens 3RB2143-4EW1 SIRIUS Overload Relay - 25-100A, Stand-alone

Siemens 3RB2143-4EW1 SIRIUS overload relay, stand-alone (phased-out).

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ManufacturerSiemens

Part number3RB2143-4EW1

Current Setting 25...100 A

Size S3

Class 5...30

Reset Manual/Automatic

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Motor protection Stand-alone installation Adjustable current Class 5-30 tripping Internal ground fault detection Screw terminals

Product description

The Siemens 3RB2143-4EW1 is a phased-out overload relay for motor protection, covering a current range of 25 to 100 A for Size S3 applications. It features adjustable tripping classes from 5 to 30 and includes internal ground fault detection. This unit is designed for stand-alone installation, utilizing straight-through transformer connections for the main circuit and screw terminals for the auxiliary circuit. It supports manual/automatic reset. This is a discontinued product; the SIRIUS 3RB3 series is its successor.

This relay was employed in standalone motor protection setups where direct mounting to a panel or enclosure was preferred over contactor mounting. Its applications spanned various industrial environments requiring reliable motor safeguarding and ground fault monitoring.

Stanlo Automation provides access to surplus industrial components. If you require the Siemens 3RB2143-4EW1 or its successor, the 3RB3143-4XW1, contact our veteran-owned team for expert assistance and availability.

Technical specifications

Current Setting	25...100 A
Size	S3
Class	5...30
Reset	Manual/Automatic
Installation	Stand-alone
Main Circuit Connection	Straight-through transformer
Auxiliary Circuit Connection	Screw Terminal
Features	Internal ground fault detection

Common applications

Motor protection

Stand-alone control panels

Industrial machinery

Pump systems

Fan units

Compatible systems

Designed for stand-alone installation, compatible with systems requiring S3 size motor protection

Also known as

Siemens 3RB2143-4EW1 relay SIRIUS stand-alone overload relay

Replaces / compatible with

This product is phased-out. The preferred successor is the Siemens SIRIUS 3RB3143-4XW1 for stand-alone applications.

Technical note

Expert tip

The stand-alone design of the 3RB2143-4EW1 allows for flexible mounting in control cabinets without requiring a specific contactor size.

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Frequently asked questions

What is the preferred successor for the Siemens 3RB2143-4EW1 overload relay?

The Siemens 3RB2143-4EW1 overload relay is a phased-out product. The preferred successor is the Siemens SIRIUS 3RB3143-4XW1, designed for similar stand-alone installations. Contact Stanlo Automation for assistance.