The motor protection switch is installed on the cable that feeds the motor and, when the motor stops due to a mechanical effect or (in three-phase systems) because a phase is missing, it detects an excessive absorption and automatically cuts off the electrical energy, thus safeguarding the integrity of the motor.

Features:

• Siemens series
• Insulation voltage with pollution degree 3 with AC nominal value 690 V
• Rated impulse withstand voltage 6 kV
• Rated operational voltage 690 V
• Frequency of use nominal value 50/60 Hz
• Operating current nominal value 52A
• Adjustable tripping value for current-dependent overload release current 42 ...52A
• Power loss at nominal AC current value in warm state 24.5W - in AC in warm state per pole 8.2W
• Design size S2
• Shock resistance according to IEC 60068-2-27 25g / 11 ms
• Mechanical service life (switching cycles) of main contacts typ 100,000 - of auxiliary contacts typ 100,000
• Installation altitude for altitude above sea level max 2000 m
• Ambient temperature during operation -20/+60 °C - during storage -50/+80 °C - during transport -50/+80 °C
• Temperature compensation -20 ... +60 °C
• Relative humidity during operation 10 ... 95 %
• 3 poles
• 2, 5 modules
• Short-circuit breaking capacity (Ics) at AC 65 kA
• Degree of protection on front side IP20
• Any mounting position
• Type of mounting screw and snap-on mounting on 35 mm DIN-rail
• Height 140 mm
• Width 55 mm
• Depth 149 mm
• Tightening torque for main contacts with screw terminals 0.8 ... 1.2 Nm
• Design of screwdriver shank Diameter 5...6 mm
• Screwdriver tip size Pozidriv 2