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Siemens 3RU2126-4DB1 Thermal Overload Relay - 20-25A, Stand-alone

Siemens 3RU2126-4DB1 Thermal Overload Relay, 20-25A, for stand-alone use.

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ManufacturerSiemens

Part number3RU2126-4DB1

Current Range 20-25 A

Size S0

Class 10

Reset Manual/Automatic

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12-month warranty

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Thermal overload protection Class 10 tripping Manual or automatic reset Stand-alone installation Screw terminals

Product description

The Siemens 3RU2126-4DB1 is a thermal overload relay designed for stand-alone motor protection applications. It offers a current range of 20-25A, is a Size S0 device, and features Class 10 tripping. This model includes screw terminals for main and auxiliary circuits and provides manual or automatic reset options.

This relay is ideal for installations where direct mounting to a contactor is not possible or desired, such as in custom control panels or existing enclosures. It provides reliable motor protection for various industrial machinery and systems.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 3RU2126-4DB1. We pride ourselves on providing quality surplus components with fast and reliable shipping to minimize your operational downtime.

Technical specifications

Current Range	20-25 A
Size	S0
Class	10
Reset	Manual/Automatic
Main Circuit Terminals	Screw
Auxiliary Circuit Terminals	Screw
Installation	Stand-alone

Common applications

Motor Control

Control Panels

Industrial Automation

Machine Building

HVAC Systems

Pump Controls

Compatible systems

Compatible with various Siemens control circuit accessories for stand-alone applications.

Also known as

3RU21264DB1 Siemens S0 overload relay stand-alone 20-25A 3RU2 Series

Replaces / compatible with

This overload relay is designed for stand-alone installation and can replace other Siemens overload relays with similar current ratings and specifications when independent mounting is required.

Technical note

Expert tip

When installing in a stand-alone configuration, ensure proper ventilation around the relay to prevent overheating, which can affect tripping accuracy.

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Frequently asked questions

What are the advantages of using a stand-alone overload relay like the 3RU2126-4DB1?

Stand-alone overload relays offer greater flexibility in installation, allowing them to be mounted independently of a contactor. This is beneficial for retrofitting older systems, designing compact control panels, or when space constraints make direct contactor mounting impractical.