Home › Manufacturers › Siemens › 3RB2143-4EB0

Siemens

Siemens 3RB2143-4EB0 SIRIUS Overload Relay - 25-100A, Size S3

Siemens 3RB2143-4EB0 SIRIUS overload relay for motor protection (phased-out).

● In Stock 12-Mo Warranty Same-Day Dispatch Ships Worldwide 🎖 Veteran-Owned

In Stock — Ready to Ship

ManufacturerSiemens

Part number3RB2143-4EB0

Current Setting 25...100 A

Size S3

Class 5...30

Reset Manual/Automatic

Get a price for 3RB2143-4EB0

Response within 1 business hour

🛡

12-month warranty

All units tested

⚡

Same-day dispatch

Order by 2pm CST

🌐

Worldwide delivery

US, EU, Asia, Middle East

🎖

Veteran-owned

CAGE: 9NK75

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

Product description

The Siemens 3RB2143-4EB0 is a phased-out overload relay designed for motor protection within the 25 to 100 A range, suitable for Size S3 contactors. It offers adjustable tripping classes from 5 to 30 and includes internal ground fault detection. This model features screw terminals for both main and auxiliary circuits and supports manual/automatic reset. Please note, this is a discontinued product, with the SIRIUS 3RB3 series being its successor.

This relay was commonly used in various industrial applications, including pump controls, fan systems, and general motor protection where ground fault detection was required. Although phased out, understanding its specifications is useful for identifying compatible replacements.

Stanlo Automation, your trusted veteran-owned source for surplus automation parts, can help you find successors or compatible alternatives to the Siemens 3RB2143-4EB0. Contact us for assistance with your obsolete part needs.

Technical specifications

Current Setting	25...100 A
Size	S3
Class	5...30
Reset	Manual/Automatic
Main Circuit Connection	Screw Terminal
Auxiliary Circuit Connection	Screw Terminal
Features	Internal ground fault detection

Common applications

Motor protection

Industrial machinery

Pump controls

Fan systems

Automation panels

Compatible systems

Compatible with Siemens Size S3 contactors

Also known as

Siemens 3RB2143-4EB0 relay SIRIUS overload relay S3

Replaces / compatible with

This product is phased-out. The preferred successor is the Siemens SIRIUS 3RB3143-4XB0.

Technical note

Expert tip

Due to its phased-out status, verify compatibility of the successor 3RB3143-4XB0 for your specific application when replacing the 3RB2143-4EB0.

What happens next?

Email confirmation

Immediate receipt acknowledgment sent to you

Account manager assigned

Confirms your part's spec and condition

Your quote delivered

Tailored to your specific requirements

Frequently asked questions

What is the successor to the phased-out Siemens 3RB2143-4EB0 overload relay?

The Siemens 3RB2143-4EB0 overload relay is a phased-out product. Its preferred successor is the Siemens SIRIUS 3RB3143-4XB0. Contact Stanlo Automation for availability of the successor or compatible alternatives.