Eaton Star-Delta Starter Combination SDAINLM70 230V 50Hz 70A 37kW 239895

In industrial motor control panels, the Eaton SDAINLM70 star-delta starter combination manages 37 kW three-phase motors at 400 V. It switches the motor from star to delta configuration, reducing inrush current during start-up. The control circuit operates at 230 V AC, 50 Hz, and the main contacts are rated for 70 A in AC-3 duty. This unit is built for DIN rail or screw mounting and uses screw terminals for main circuit connections. It does not include overload or short-circuit protection; those must be supplied externally.

Key specifications

• Starter type: Star-delta starter combination
• Control voltage: 230 V AC, 50 Hz
• Rated operational current (Ie) AC-3, 400 V: 70 A
• Rated operational power (P) AC-3, 400 V: 37 kW
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 8 kV
• Number of poles (main circuit): 3-pole
• Auxiliary contacts: 3 NO + 3 NC
• Overload protection: Not integrated
• Short-circuit protection: Not integrated
• Mounting type: DIN rail / screw mounting
• Degree of protection: IP20
• Ambient operating temperature: -25 to +60 °C
• Main circuit connection: Screw terminals
• Standards: IEC/EN 60947
• Contactor size (main/delta): DILM65
• Contactor size (star): DILM40
• Electrical life (AC-3): 1.5 million operations
• Mechanical life: 10 million operations

Why choose it

This starter combination reduces mechanical and electrical stress on motors by lowering starting current. It is a complete assembly with main, delta, and star contactors, simplifying panel design and wiring. The 230 V AC coil voltage matches common control circuits.

Ideal use cases

• Starting three-phase squirrel-cage motors up to 37 kW at 400 V
• Industrial machines requiring reduced inrush current, such as pumps, fans, and compressors
• Control panels where external overload and short-circuit protection are already provided

Good to know

The unit is rated IP20 and must be installed in an enclosure. It complies with IEC/EN 60947. Overload and short-circuit protection devices must be selected and installed separately according to the motor and application.