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Siemens 3RU2126-4DB0 Thermal Overload Relay - 20-25A, Size S0

Siemens 3RU2126-4DB0 Thermal Overload Relay, 20-25A, for motor protection.

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ManufacturerSiemens

Part number3RU2126-4DB0

Current Range 20-25 A

Size S0

Class 10

Reset Manual/Automatic

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Thermal overload protection Class 10 tripping Manual or automatic reset Contactor mounting Screw terminals

Product description

The Siemens 3RU2126-4DB0 is a thermal overload relay designed for robust motor protection, covering a current range of 20-25A. It is a Size S0 device with Class 10 tripping characteristics, ensuring reliable safeguarding against overcurrent conditions. This relay features screw terminals for both main and auxiliary circuits and supports manual and automatic reset.

This overload relay is essential for protecting medium to larger industrial motors found in applications like pump stations, large conveyors, and heavy manufacturing equipment. Its durable construction ensures consistent performance in demanding environments.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 3RU2126-4DB0. We provide high-quality surplus components with competitive pricing and fast 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

Common applications

Motor Control

Pump Systems

Conveyor Systems

Industrial Machinery

Manufacturing Plants

Mining Equipment

Compatible systems

Siemens 3RT2 Series Contactors Siemens 3RT1 Series Contactors

Also known as

3RU21264DB0 Siemens S0 overload relay 20-25A 3RU2 Series

Replaces / compatible with

This overload relay is designed for direct mounting onto Siemens contactors and can serve as a replacement for other Siemens overload relays with identical current ratings and physical dimensions.

Technical note

Expert tip

When using the automatic reset feature, ensure that the motor can safely restart without immediate re-tripping by implementing appropriate control logic.

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Frequently asked questions

What is the purpose of the manual/automatic reset feature on the Siemens 3RU2126-4DB0 overload relay?

The manual reset function requires a technician to physically reset the relay after a trip event. The automatic reset function allows the relay to reset itself once the overload condition has cleared, which can be useful in automated systems where manual intervention is difficult.