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Siemens 3RU2126-1KB0 Thermal Overload Relay - 9-12.5A

Siemens 3RU2126-1KB0 Thermal Overload Relay

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ManufacturerSiemens

Part number3RU2126-1KB0

Adjustable current range 9-12.5A

Trip Class 10

Size S0

Mounting Contactor mounting

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Thermal overload protection Phase loss sensitivity Manual/Automatic reset Direct mounting on S0 contactors Screw terminals Class 10 trip class

Product description

The Siemens 3RU2126-1KB0 is a high-performance thermal overload relay from the SIRIUS 3RU2 series, designed for robust motor protection. It offers an adjustable current range of 9-12.5A and a Class 10 trip rating, ensuring reliable safeguarding against overloads and phase failures. This relay is engineered for direct mounting onto Siemens 3RT2 size S0 contactors. It features screw terminals for main and auxiliary circuits and supports both manual and automatic reset operations, providing flexibility for various industrial applications.

The 3RU2126-1KB0 is widely employed in demanding industrial environments, including manufacturing, material processing, and heavy machinery operations. Its phase loss sensitivity and precise tripping characteristics contribute to operational safety and equipment longevity.

As a veteran-owned distributor, Stanlo Automation offers the Siemens 3RU2126-1KB0 with a commitment to quality and customer satisfaction. We provide competitive pricing and efficient shipping to ensure your automation needs are met promptly.

Technical specifications

Adjustable current range	9-12.5A
Trip Class	10
Size	S0
Mounting	Contactor mounting
Main circuit connection	Screw
Auxiliary circuit connection	Screw
Reset function	Manual/Automatic
Poles	3
Rated operational voltage	690V AC

Common applications

Manufacturing

Material processing

Heavy machinery

Pump systems

HVAC

Industrial automation

Compatible systems

Compatible with Siemens 3RT2 size S0 contactors (e.g., 3RT2023, 3RT2024, 3RT2025, 3RT2026, 3RT2027, 3RT2028).

Also known as

Siemens 3RU2126-1KB0 3RU21261KB0 SIRIUS 3RU2 overload relay

Replaces / compatible with

This relay is part of the Siemens SIRIUS 3RU2 series and is designed for direct mounting onto Siemens 3RT2 size S0 contactors. For older 3RU1126 overloads, a separate mounting bracket or contactor replacement may be needed.

Technical note

Expert tip

The relay features an integrated test function for troubleshooting and verification of the tripping mechanism, ensuring reliable operation.

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Frequently asked questions

What is the maximum rated operational voltage for the Siemens 3RU2126-1KB0 overload relay?

The Siemens 3RU2126-1KB0 thermal overload relay has a maximum rated operational voltage of 690V AC. This makes it suitable for a wide range of industrial power systems.