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Siemens 3RU2126-1CB0 Thermal Overload Relay - 1.8-2.5A

Siemens 3RU2126-1CB0 Thermal Overload Relay

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ManufacturerSiemens

Part number3RU2126-1CB0

Adjustable current range 1.8-2.5A

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 3RU2126-1CB0 is a thermal overload relay designed for motor protection within the SIRIUS 3RU2 series. It offers an adjustable current range of 1.8-2.5A and a Class 10 trip rating, providing essential protection against overloads and phase failures. This relay features direct contactor mounting for Size S0 contactors, with screw terminals for both main and auxiliary circuits. It supports manual or automatic reset operations, making it a versatile component for various industrial setups.

The 3RU2126-1CB0 is widely used in motor control centers, pump applications, conveyor systems, and other industrial automation where reliable motor safeguarding is critical. Its compact design and ease of integration simplify installation and maintenance.

Stanlo Automation is your reliable source for the Siemens 3RU2126-1CB0. As a veteran-owned business, we pride ourselves on delivering quality surplus parts with exceptional service and competitive pricing. Partner with us for your automation needs.

Technical specifications

Adjustable current range	1.8-2.5A
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

MCC panels

Pump applications

Conveyor systems

Compressors

HVAC units

Industrial automation

Compatible systems

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

Also known as

Siemens 3RU2126-1CB0 3RU21261CB0 SIRIUS 3RU2 overload relay

Replaces / compatible with

This relay is part of the Siemens SIRIUS 3RU2 series. It 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 includes integrated phase loss sensitivity and can be set for manual or automatic reset, providing flexibility in motor protection strategies.

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Frequently asked questions

What size contactor is the Siemens 3RU2126-1CB0 compatible with?

The Siemens 3RU2126-1CB0 thermal overload relay is designed for direct mounting onto Siemens 3RT2 size S0 contactors. This ensures a secure and space-saving installation in motor control applications.