General Purpose Motors/3 Phase Standard Efficiency (IE1)/CT Series (Cast Iron Frame)/CT Series – Standard Efficiency (IE1) 3 Phase Cast Iron Induction Motor

CT Series – Standard Efficiency (IE1) 3 Phase Cast Iron Induction Motor

ATT CT Series compromises of 3-phase, squirrel cage, IE1 standard efficiency (IEC 60034-30-1) motors in  Cast Iron frame.


ATT CT series motors are all-purpose and highly efficient, making them well-suited for general application machines such as pumps, fans, and many more. Our CT series induction motors are widely recognized by their optimum performance even in challenging work conditions. CT series motors are suitable for continuous S1 duty, which means that it can operate under constant load and lasting long enough to allow the machine to reach thermal equilibrium.


The CT series can be used for various general purpose applications in machines such as fans, pumps, electric power packs etc.

Item Standard Specifications
Type of Motor Totally Enclosed Fan Cooled (TEFC) Squirrel Cage Cast Iron Induction Motor
Design Standard IEC 60034-1
Framesize 80-355L
Voltage and Frequency Standard stock available are:

220-240/380-415V/50Hz for 2.2 KW & below

380-415/660-720V/50Hz for 3KW & above

Other voltages & frequency such as 200V, 346V, 440V & 60Hz can be supplied on request

Power Conditions ± 5% of rated voltage and ± 1% frequency± 1% phase unbalance
Efficiency Standard IE2 (IEC 60034-30-1)
Time Duty Continuous S1
Cooling Method Self external fan, surface cooling (IC 411)
Method of Starting Full voltage direct on line starting or star-delta starting
Insulation & Temperature Rise Class Class F insulation and Class B temperature rise
Degree of Protection IP55
Rotor Winding Squirrel cage, aluminium conductor with end-ring and wafter blades integrally cast
Environmental Conditions Place: Non-hazardous, shaded

Ambient temperature: -20°C to 40°C

Relative humidity: Less than 90% relative humidity (non-condensation)

Altitude: Up to 1,000 metres above sea level

Direction of Rotation Standard motors are suitable for operation in either direction of rotation of shaft.

Direction of rotation can be reversed by interchanging any two of the power lines.

Test Procedure IEC and full voltage measuring starting operation
Fan Cover Pressed steel
Shaft Carbon Steel, round shaft with key
Bearing Grease pre-packed shielded ball bearing
Lubrication Lithium-base grease (Shell Alvania R3)
Painting Phenolic rust-proof base plus lacquer surface finish. Painting in ATT IE2 Green
Ground Terminal NE set inside the terminal box


Other Options Available (Contact ATT to inquire for other options)
VSD Driven Inverter duty motor suitable for VSD operation
Heaters Space heaters (110V/220V/1ph) or winding heaters available on request
Thermal Protection PTC thermistor 150°C
Insulation Class Class H
Degree of Protection Up to IP66

The table below contains the various types of mounting available for CT Series motors. If you are unable to find the dimensions to the mounting you prefer, please contact us for the outlining dimensions.