Product Description:

The 175G5251 soft starter is manufactured by Danfoss and belongs to the MCD Soft Starters series. Designed for three-phase induction motors, the unit regulates inrush current and torque during start-up and coast-down, reducing mechanical stress and electrical peaks in automated process lines. It is part of the VLT Soft Starter MCD product group. This type of control is commonly used on pumps, fans, compressors, and conveyor systems that benefit from reduced starting shock.

Rated for supply voltages between 200-575 VAC, the device can be installed on networks that cover low- to medium-voltage panels in industrial plants. During operation, it can pass a continuous current of 170 A. The open-frame construction carries an IP00 enclosure rating, so the starter must be mounted inside a protected cabinet away from accidental contact. Mechanical dimensions follow the C-Frame footprint used across the MCD 202 line. A 24 VAC or VDC control supply powers the logic, and an internal bypass relay automatically bridges the thyristors after ramp-up to minimize heat losses. The three-phase topology keeps phase balance stable, and programmable ramps provide smooth motor engagement.

During each start, the starter can deliver a motor switching capacity of 90 kW while drawing a peak start current of 4 × FLC for the selected acceleration profile. The initial ramp lasts 6 s, after which the internal bypass keeps conduction losses low, and the main contactor provides an auxiliary output of 6 A @ 250 VAC for feeder interlocking or status lamps. To protect the motor and power electronics, a minimum off interval of 594 s is enforced between successive cycles, which helps limit thermal buildup during repeated starts. Service life is rated for 100,000 operations under nominal conditions, for repeated motor-starting duty.