Siemens Overload relay for motor protection, size S00, 1.8-2.5A Part number 3RU2116-1CB0

Product Overview

Siemens thermal overload relay (3RU2116-1CB0) is a compact motor protection device designed to safeguard three-phase motors against overheating and overload conditions. With an adjustable current range of 1.8 … 2.5 A and a Class 10 tripping characteristic, this relay provides reliable inverse-time overload protection. It is intended for mounting with compatible SIRIUS Size S00 contactors, featuring screw connections for both main and auxiliary circuits and selectable manual or automatic reset modes for flexible reset behaviour.

Key Features

• Thermal overload relay for three-phase motor protection
• Adjustable current range: 1.8 … 2.5 A
• Class 10 tripping characteristic for dependable overload response
• Designed for use with Size S00 SIRIUS contactors
• Manual or automatic reset options
• Screw terminal connections for secure wiring
• Compact and rugged industrial design
• Includes 1 normally open (NO) + 1 normally closed (NC) auxiliary contact

Technical Specifications

• Article Number: 3RU2116-1CB0
• Product Family: SIRIUS overload relays
• Device Type: Thermal overload relay
• Current Setting Range: 1.8 … 2.5 A
• Tripping Class: Class 10
• Number of Poles Protected: 3
• Main Circuit Connection: Screw terminals
• Auxiliary Contacts: 1 NO + 1 NC
• Mounting Type: Mounts directly to SIRIUS Size S00 contactors
• Reset Mode: Manual or automatic reset selectable
• Rated Insulation Voltage: 690 V
• Rated Surge Withstand Voltage: 6 kV
• Power Loss (typical): approx. 5.7 W total (approx. 1.9 W per pole)
• Operating Temperature Range: –40 °C to +70 °C
• Storage Temperature Range: –55 °C to +80 °C
• Protection Rating: IP20 when installed in enclosure
• Housing Colour: Light grey
• Dimensions (approx.): Standard Size S00 form factor
• Weight (approx.): ~0.16 kg

Compliance & Certifications

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

Applications

The Siemens 3RU2116-1CB0 overload relay is used to protect three-phase motors in industrial control panels, motor starters and automation systems. It ensures automatic disconnection under overload conditions, provides auxiliary signalling via auxiliary contacts and can be reset manually or automatically, making it suitable for machinery, conveyor, pump and general motor protection applications.