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Siemens 3RU2126-4CB0 Thermal Overload Relay - 17-22A, Size S0

Siemens 3RU2126-4CB0 Thermal Overload Relay, 17-22A, for motor protection.

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ManufacturerSiemens

Part number3RU2126-4CB0

Current Range 17-22 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 Contactor mounting Screw terminals

Product description

The Siemens 3RU2126-4CB0 is a high-performance thermal overload relay designed for motor protection within a 17-22A current range. As a Size S0 device with Class 10 tripping, it ensures reliable operation and safeguards motors from damage. This relay features screw terminals for both main and auxiliary circuits and supports manual or automatic reset.

This overload relay is crucial for protecting motors in demanding industrial applications such as heavy machinery, manufacturing lines, and large fan systems. Its robust design guarantees consistent performance and extended equipment life.

Stanlo Automation, a veteran-owned distributor of surplus industrial parts, offers the Siemens 3RU2126-4CB0. We provide competitively priced, quality surplus components with expedited shipping to minimize your operational interruptions and downtime.

Technical specifications

Current Range	17-22 A
Size	S0
Class	10
Reset	Manual/Automatic
Main Circuit Terminals	Screw
Auxiliary Circuit Terminals	Screw

Common applications

Motor Control

Heavy Machinery

Industrial Automation

Manufacturing

Large Fan Systems

Material Handling

Compatible systems

Siemens 3RT2 Series Contactors Siemens 3RT1 Series Contactors

Also known as

3RU21264CB0 Siemens S0 overload relay 17-22A 3RU2 Series

Replaces / compatible with

This overload relay is designed for use with Siemens contactors and can replace other Siemens overload relays with similar current ratings and mounting requirements.

Technical note

Expert tip

For optimal protection, ensure the overload relay's current setting is closely matched to the motor's full load ampere (FLA) rating, typically between 90-100% of the FLA.

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Frequently asked questions

What is the maximum motor size recommended for the Siemens 3RU2126-4CB0 overload relay?

The Siemens 3RU2126-4CB0 is rated for 17-22A and is typically used with motors up to approximately 10 HP (7.5 kW) at 400V, depending on the motor's full load current. Always consult the motor's nameplate and relevant electrical codes for precise application.