Product Overview

Circuit breaker size S0 for motor protection, CLASS 10 A-release 2.8...4 A N release 52 A Spring-type terminal Standard switching capacity

Key Features

• Size: S0 (45 mm width)
• Current Range: 2.8...4 A adjustable thermal overload release
• Short-circuit Release: 52 A (N-release)
• Trip Class: CLASS 10 according to IEC 60947-4-1
• Connection System: Spring-type terminal
• Switching Capacity: Standard switching capacity
• Number of Poles: 3-pole
• Rated Operational Voltage: Up to 690 V AC
• Rated Frequency: 50/60 Hz

Technical Specifications

Standards Compliance:

• IEC 60947-1, EN 60947-1 (VDE 0660 Part 100)
• IEC 60947-2, EN 60947-2 (VDE 0660 Part 101)
• IEC 60947-4-1, EN 60947-4-1 (VDE 0660 Part 102)
• UL 508 (UL 60947-4-1), CSA C22.2 No. 14 (CSA-C22.2 No. 60947-4-1)

Operating Conditions:

• Ambient Temperature: -20°C to +70°C (with current reduction above +60°C)
• Mounting Position: Any position according to IEC 60447
• Degree of Protection: IP20
• Touch Protection: Finger-safe according to DIN EN 50274
• Net Weight: 0.400 kg

Performance Features:

• Phase loss sensitivity for reliable motor protection
• Integrated overload and short-circuit protection
• Temperature compensation from -20°C to +60°C
• Test function for operational verification
• Isolating function according to IEC 60947-2
• Explosion protection approval for motors with "increased safety" type (EEx e)
• Short-circuit breaking capacity up to 55 kA at 400V AC

Applications

• Motor protection for three-phase motors (2-3 HP range)
• Overload and short-circuit protection
• System protection applications
• Load feeder protection
• Control circuit switching
• Suitable for motors with rated currents between 2.8-4 A
• Industrial automation and process control applications

Connection System

Spring-loaded Terminals:

• Tool Required: Ø 3.0 x 0.5 mm (3RA2908-1A)
• Conductor Cross-sections:
  • Solid and stranded: 2 x (1.0 to 10) mm²
  • Finely stranded without end sleeve: 2 x (1.0 to 6.0) mm²
  • Finely stranded with end sleeve: 2 x (1.0 to 6.0) mm²
  • AWG cables: 2 x (18 to 8)
• Tightening Torque: Tool-free spring connection
• Maximum outer diameter of conductor insulation: 3.6 mm

Accessories Available

• Auxiliary switches (transverse and lateral)
• Signaling switches for status monitoring
• Auxiliary releases (undervoltage and shunt)
• Disconnector modules
• Door-coupling rotary operating mechanisms
• Enclosures and mounting accessories
• Link modules for contactor integration
• 3-phase busbar systems
• Sealable covers for tamper protection

Installation

• Mounting: 35 mm DIN rail according to DIN EN 60715 or screw mounting
• Clearance Requirements: 30 mm from grounded or live parts
• Connection: Spring-loaded terminals for quick and secure wiring
• Modular System: Compatible with SIRIUS 3RT2 contactors and accessories
• Package Dimensions: 52.50 x 133.00 x 106.50 mm
• Snap-on mounting for easy installation and removal

Compliance & Environmental

• Country of Origin: Germany
• RoHS Compliance: Since 01.10.2009
• WEEE Compliance: Take-back obligation applies
• REACH Regulation: Contains lead in concentrations >0.1% w/w
• UL/CSA Approvals: Available for North American applications
• ATEX Approval: For hazardous area applications
• Product Class: A - Standard product, stock item with return guidelines

Quality & Reliability

• Manufactured in Germany with strict quality control
• Long-term stability with proven bimetal technology
• Mechanical endurance: 100,000 operating cycles
• Electrical durability: 100,000 operating cycles
• Maximum switching frequency: 15 starts per hour

Download existing graphical data for this product:

• Technical Data Sheet
• Dimension Drawings
• Wiring Diagrams
• CAD Data
• 3D Models
• Product Manual
• Configuration Tool
• Product Support Portal

Additional Resources

• SIRIUS System Overview
• Technical Assistance
• Online Training
• Industry Mall
• SIRIUS 3RV2 Motor Starter Protectors