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Siemens 3RU2126-1FB0 Thermal Overload Relay - 3.5-5.0A

Siemens 3RU2126-1FB0 Thermal Overload Relay

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ManufacturerSiemens

Part number3RU2126-1FB0

Adjustable current range 3.5-5.0A

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 3RU2126-1FB0 is a thermal overload relay within the SIRIUS 3RU2 series, designed for comprehensive motor protection. It provides an adjustable current range of 3.5-5.0A and a Class 10 trip rating, offering reliable defense against overloads and phase failures. This relay is optimized for direct mounting onto Siemens 3RT2 size S0 contactors. It features convenient screw terminals for both main and auxiliary circuits and offers manual or automatic reset capabilities, ensuring adaptability for diverse industrial applications.

The 3RU2126-1FB0 is ideal for applications in manufacturing, material handling, and pump systems where precise motor protection is essential. Its phase loss sensitivity and robust construction ensure operational integrity and prolong equipment lifespan.

Stanlo Automation, a veteran-owned distributor of industrial automation surplus, offers the Siemens 3RU2126-1FB0. We provide quality parts, competitive pricing, and reliable service to meet your automation needs.

Technical specifications

Adjustable current range	3.5-5.0A
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 automation

Material handling

Pump systems

HVAC controls

Conveyor systems

Industrial machinery

Compatible systems

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

Also known as

Siemens 3RU2126-1FB0 3RU21261FB0 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's bimetal switching mechanism provides current-dependent protection against temperature rises caused by overload or phase failure.

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Frequently asked questions

Can the Siemens 3RU2126-1FB0 overload relay be automatically reset?

Yes, the Siemens 3RU2126-1FB0 thermal overload relay supports both manual and automatic reset operations. Automatic reset can be configured after a specified recovery time has elapsed following a trip event.