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Siemens 3RU1146-4LB0 70-90A Class 10 Motor Overload Relay

Siemens 3RU1146-4LB0 Size S3 Motor Overload Relay.

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ManufacturerSiemens

Part number3RU1146-4LB0

Current Range 70-90 A

Size S3

Class 10

Reset Manual/Automatic

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12-month warranty

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Motor thermal overload protection Adjustable current setting Class 10 tripping Manual/automatic reset capability Contactor mounting Screw terminals

Product description

The Siemens 3RU1146-4LB0 is a Size S3 overload relay designed for motor protection, covering a current range of 70-90A with Class 10 tripping characteristics. It features screw terminals for main and auxiliary circuits and supports manual or automatic reset. This product is phased out, with the SIRIUS 3RU2 series, specifically 3RU2146-4LB0, indicated as its successor.

This overload relay is essential for safeguarding large industrial motors against thermal overloads and phase unbalance in applications such as heavy-duty machinery, large fan and pump systems, and manufacturing processes. Its robust design ensures reliable operation in demanding environments.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation components, offers the Siemens 3RU1146-4LB0. Sourcing from Stanlo allows you to acquire necessary parts for your automation systems, including hard-to-find or obsolete items, at competitive prices.

Technical specifications

Current Range	70-90 A
Size	S3
Class	10
Reset	Manual/Automatic
Main Circuit Terminals	Screw
Auxiliary Circuit Terminals	Screw

Common applications

Large industrial motors

Heavy-duty machinery

Industrial fans

Pump systems

Manufacturing processes

Material handling equipment

Compatible systems

Designed for direct mounting on Siemens contactors of size S3

Also known as

Siemens 3RU1146 SIRIUS overload S3 overload relay 70-90A motor protection

Replaces / compatible with

This part is phased out. The successor is the Siemens SIRIUS 3RU2146-4LB0.

Technical note

Expert tip

When replacing with the successor part, verify the mounting dimensions and terminal compatibility to ensure a seamless integration into your existing control panel.

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Frequently asked questions

What is the recommended replacement for the Siemens 3RU1146-4LB0 overload relay?

The Siemens 3RU1146-4LB0 overload relay is a discontinued model. The successor recommended by Siemens is the SIRIUS 3RU2146-4LB0, part of the newer 3RU2 series, designed to offer equivalent motor protection.