Siemens Overload relay for motor protection, size S0, 7-10A Part number 3RU2126-1JB0

Product Overview

Siemens overload relay (3RU2126-1JB0) is a thermal motor protection device designed to safeguard three-phase motors from overload conditions. With an adjustable current range of 7.0 to 10 A and Class 10 tripping characteristics, this relay provides reliable motor protection and integrates directly with SIRIUS Size S0 contactors. It supports screw connections for both main and auxiliary circuits and offers manual, automatic and reset functionality for flexible motor control and protection schemes.

Key Features

• Thermal overload relay for motor protection
• Adjustable current range: 7.0 … 10 A
• Size S0 version for compact contactor combinations
• Class 10 tripping characteristic for motor protection
• Easy screw connections on main and auxiliary circuits
• Manual, automatic and reset operation options
• Direct mounting on compatible SIRIUS contactors
• Robust industrial design for reliable operation

Technical Specifications

• Article Number: 3RU2126-1JB0
• Product Family: SIRIUS overload relays
• Device Type: Thermal overload relay
• Current Setting Range: 7.0 … 10 A
• Tripping Class: Class 10
• Motor Protection Type: Thermal overload
• Main Circuit Connections: Screw terminals
• Auxiliary Circuit Connections: Screw terminals
• Mounting Type: Direct mounting on SIRIUS S0 contactors
• Reset Mode: Manual, automatic or remote reset
• Operating Temperature Range: –25 °C to +60 °C
• Protection Rating: IP20 when installed in an enclosure
• Housing Colour: Light grey
• Dimensions (approx.): Compact Size S0 form factor
• Weight (approx.): Light industrial relay weight

Compliance & Certifications

• Manufactured to Siemens industrial quality and motor protection standards
• CE compliant
• RoHS compliant

Applications

The Siemens 3RU2126-1JB0 overload relay is used to protect three-phase motors against overload and phase imbalance conditions. It is typically combined with Size S0 contactors to create motor starters in industrial control panels, machinery automation systems and HVAC installations where dependable thermal motor protection and reset flexibility are required.