Siemens Circuit breaker for motor protection, size S2, 949A

Product Overview

Circuit breaker size S2 for motor protection, CLASS 10 A-release 54...65 A N-release 845 A screw terminal Standard switching capacity

Key Features

• Size: S2 (55 mm width)
• Current Range: 54...65 A adjustable thermal overload release
• Short-circuit Release: 845 A (N-release)
• Trip Class: CLASS 10 according to IEC 60947-4-1
• Connection System: Screw-type terminal
• 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, IEC 60947-2, IEC 60947-4-1
• UL 508, CSA C22.2 No. 14
• ISO 13849, IEC 61508 compliant

Operating Conditions:

• Ambient Temperature: -20°C to +60°C
• Storage Temperature: -50°C to +80°C
• Degree of Protection: IP20
• Installation Altitude: Maximum 2,000 m above sea level
• Net Weight: 1.178 kg

Performance Features:

• Phase failure detection for reliable motor protection
• Integrated overload and short-circuit protection
• ON/OFF rotary handle with lockout capability
• Short-circuit breaking capacity up to 100 kA at 240V AC
• Mechanical service life: 20,000 operating cycles

Screw Terminal Connection System

• Tool Required: Pozidriv size 2 screwdriver
• Tightening Torque: 3-4.5 N·m for main contacts
• Thread Design: M6 for main contacts
• Conductor Cross-sections: 2 x (1 to 35) mm², 1 x (1 to 50) mm²
• AWG cables: 2 x (18 to 2), 1 x (18 to 1)

Applications

• Motor protection for three-phase motors (50-60 HP range)
• Overload and short-circuit protection for high-power applications
• Industrial automation and process control applications
• Suitable for motors with rated currents between 54-65 A
• Heavy-duty industrial applications
• Energy-efficient IE3 motor applications

Motor Power Ratings

• 230V AC: 18.5 kW (25 HP)
• 400V AC: 30 kW (40 HP)
• 460/480V AC: 45 kW (50 HP)
• 575/600V AC: 55 kW (60 HP)
• 690V AC: 55 kW (75 HP)

Installation

• Mounting: 35 mm DIN rail according to DIN EN 60715
• Package Dimensions: 62.00 x 147.00 x 167.00 mm
• Side-by-side mounting capability with 0 mm spacing
• Top and bottom terminal arrangement

Compliance & Environmental

• Country of Origin: Germany
• RoHS Compliance: Since 10.04.2015
• UL/CSA Approvals: Available for North American applications
• Maritime Application: Certified for marine environments
• REACH Regulation: Contains lead and lead titanium zirconium oxide >0.1% w/w

Motor Protection Benefits

• Prevents motor damage from overload conditions
• Protects against phase loss and unbalanced loads
• Extends motor life through precise current monitoring
• Superior N-release rating (845A) for high-power applications
• CLASS 10 trip characteristics for consistent performance
• Temperature compensated operation across wide ranges

Advanced Protection Features

• Extended Current Range: 54-65A suitable for large motors
• Superior Short-Circuit Protection: 845A N-release for maximum safety
• Reliable Trip Characteristics: CLASS 10 tripping for consistent performance
• Phase Loss Detection: Protects against unbalanced load conditions
• Magnetic Trip Elements: Fast response to short-circuit conditions
• Thermal Overload Protection: Accurate thermal protection for motors

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