MCD3018-T5-B21-CV4 Danfoss
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The Danfoss MCD3018-T5-B21-CV4 is a soft starter from the MCD Soft Starters series that offers an AC53a rating of 39 Amps and an AC53b rating of 41 Amps. It has IP21 protection, measures 530 mm in height, 132 mm in width, and 270 mm in depth, and weighs 11 kilograms. The soft starter features a relay output rating of 5 Amps at 250 VAC with an impulse withstand of 2 kV.
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Product Description:
The MCD3018-T5-B21-CV4 is a three-phase soft starter produced by Danfoss and supplied within the MCD Soft Starters series. By managing the conduction angle of its SCR stack during motor run-up and ramp-down, the unit limits inrush current and reduces mechanical stress on driven equipment. This controlled acceleration and deceleration supports smoother operation in conveyor, pump, and fan systems used throughout industrial automation.
The motor duty capability includes an AC-53a current rating of 39 A for standard starts and an AC-53b current rating of 41 A for heavier cyclic loads. These separate ratings allow the starter to accommodate different operating cycles without applying the same current limit to every application. Protection against fault energy is supported by a short-circuit withstand rating of 100 kA, while the enclosure has an ingress protection rating of IP21. This enclosure rating provides protection against finger contact and vertically dripping water when the unit is installed indoors. Conducted emissions comply with EMC Class A, making the starter suitable for industrial power networks. An impulse withstand rating of 2 kV helps protect the control electronics against line transients, while an SCR I²t value of 10,500 A²s indicates the thermal energy that the semiconductor stack can tolerate during fault clearing. The housing is 132 mm wide and weighs 11 kg, allowing it to fit within a single column in many motor control center sections without placing excessive load on the mounting structure.
The housing has a mounting depth of 270 mm and an overall height of 530 mm, leaving room for installation and heat dissipation above and below the unit. Appropriate cabinet clearances allow air to move around the starter and help prevent heat from accumulating near adjacent components. The start input accepts 24 VDC at 8 mA, allowing direct control from compatible PLC transistor outputs without an intermediate interface relay. For status indication or interlock circuits, the unit provides a relay rated at 5 A at 250 VAC with a 360 VA limit. This relay can switch compatible contactor coils or alarm lamps while keeping the starter’s control signals separate from the connected field circuit.
