Product Description:

The 175G5239 is a three-phase soft starter manufactured by Danfoss for the MCD Soft Starters series and used in the MCD 202 line. This controller limits mechanical and electrical stress when large induction motors are energized, making it suitable for conveyors, pumps, and fans that cannot tolerate across-the-line starting. By reducing the current surge at startup, it helps limit belt slip, pressure shock, and abrupt torque transfer in connected machinery. Soft starting also reduces sudden line voltage dips that can affect other equipment connected to the same supply.

The starter is rated for applications up to 75 kW and can deliver a continuous motor current of 140 A. It accepts mains input from 200-575 VAC, while the control circuit can be powered from 110/240 VAC or 440 VAC; the separate supply keeps the logic active during mains interruptions. Duty classification AC53b 4-6:594 indicates the allowable start and stop cycles and the cooling intervals for high-inertia loads. The housing has a protection rating of IP00, so the unit must be installed inside a guarded enclosure. It also carries Class B EMC performance, uses frame size C, and operates on three-phase power networks without additional reactors. This arrangement supports standard industrial power systems across a broad range of regional supply voltages.

Peak current during the initial ramp is limited to 10 A, which reduces mechanical shock on couplings and gears during motor startup. For fault coordination, the starter withstands a prospective short circuit of 10 kA when protected by the specified fuse. Its electrical endurance is rated for 100,000 operations, and the trip function disconnects the load at 105 percent thermal overload to protect motor windings from sustained overcurrent. Controlled deceleration is useful where stopping shock must be reduced without adding a full variable-frequency drive.