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Siemens 3RU2126-4BB1 Thermal Overload Relay - 14-20A, Size S0

Siemens 3RU2126-4BB1 Thermal Overload Relay, 14-20A, for stand-alone use.

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ManufacturerSiemens

Part number3RU2126-4BB1

Current Range 14-20 A

Size S0

Class 10

Reset Manual/Automatic

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Thermal overload protection Class 10 tripping Manual or automatic reset Stand-alone installation Screw terminals

Product description

The Siemens 3RU2126-4BB1 is a thermal overload relay built for robust motor protection in stand-alone installations. It covers a current range of 14-20A and is a Size S0 unit with Class 10 tripping capabilities. This model features screw terminals for both main and auxiliary circuits and supports manual or automatic reset.

This relay is suitable for applications requiring independent mounting, such as in control cabinets where direct contactor mounting is not feasible. It provides reliable protection for motors in manufacturing, material processing, and facility management.

Stanlo Automation, your trusted source for surplus industrial automation parts, offers the Siemens 3RU2126-4BB1. As a veteran-owned business, we prioritize delivering quality products quickly to minimize your operational interruptions.

Technical specifications

Current Range	14-20 A
Size	S0
Class	10
Reset	Manual/Automatic
Main Circuit Terminals	Screw
Auxiliary Circuit Terminals	Screw
Installation	Stand-alone

Common applications

Motor Control

HVAC Equipment

Pump Stations

Industrial Automation

Control Panels

Machine Safety

Compatible systems

Compatible with various Siemens control circuit accessories for stand-alone applications.

Also known as

3RU21264BB1 Siemens S0 overload relay stand-alone 3RU2 Series

Replaces / compatible with

This relay is designed for stand-alone mounting and can be used in place of other Siemens overload relays with similar electrical specifications where independent installation is required.

Technical note

Expert tip

For stand-alone installation, ensure appropriate mounting hardware is used to securely fix the relay to a control panel or mounting plate.

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Frequently asked questions

What is the difference between the 3RU2126-4BB0 and 3RU2126-4BB1 overload relays?

The primary difference is the mounting type. The 3RU2126-4BB0 is designed for contactor mounting, while the 3RU2126-4BB1 is intended for stand-alone installation, though both share the same current range and electrical characteristics.