RSE4003-B - DIN MTR SOFT START 400V 3A

Why Choose the Carlo Gavazzi RSE4003-B Soft Starter?

The Carlo Gavazzi RSE4003-B is a compact and highly reliable three-phase soft starter for induction motors, designed to provide smooth motor acceleration while reducing mechanical stress and electrical inrush current. As part of the advanced Carlo Gavazzi RSE soft starter series, this unit is ideal for industrial machinery, pumps, fans, conveyors and automation systems requiring dependable motor starting performance.

Featuring 2-phase controlled soft starting, integrated internal bypass relays and a slim DIN rail mounting format, the RSE4003-B simplifies panel integration while improving system efficiency and reducing installation space requirements. The internal bypass system reduces heat generation during operation, improving long-term reliability inside control cabinets.

With a rated operational current of 3 A and support for 340–460 V AC three-phase systems, this soft starter is designed for smaller induction motors up to approximately 1.5 kW at 400 V AC. The wide-range control voltage input allows flexible integration into modern industrial control systems and automation panels.

Key Advantages

• Compact three-phase induction motor soft starter.
• 3 A operational current suitable for small industrial motors.
• Reduces motor inrush current and mechanical shock during startup.
• Integrated bypass relays reduce panel heat dissipation.
• DIN rail mounting for compact control panel installation.
• Wide-range control voltage compatibility for flexible automation integration.

Key Features

• Carlo Gavazzi RSE soft starter series.
• 3 A rated operational current.
• 340–460 V AC operational voltage.
• 24–110 V AC/DC and 110–480 V AC control voltage.
• 2-phase controlled soft starting.
• Integrated internal bypass relays.
• Compact DIN rail mounting format.
• Suitable for induction motors up to approximately 1.5 kW at 400 V AC.
• Reduced electrical and mechanical stress during startup.
• Industrial-grade compact housing.

Technical Specifications

• Manufacturer: Carlo Gavazzi
• Series: RSE Soft Starters
• Model: RSE4003-B
• Product type: Three-phase soft starter for induction motors
• Rated operational current: 3 A
• Operational voltage: 340–460 V AC
• Rated motor power at 400 V: 1.5 kW
• Control voltage: 24–110 V AC/DC and 110–480 V AC
• Controlled phases: 2-phase control
• Frequency: 50 / 60 Hz
• Integrated bypass: Yes
• Mounting type: DIN rail mounting
• Protection rating: IP20
• Dimensions (W × H × D): 45 × 82 × 102.5 mm
• Operating temperature: -20 °C to +50 °C
• Application type: Induction motor soft starting

Reliable Soft Starting for Industrial Motors

Soft starters such as the Carlo Gavazzi RSE4003-B gradually increase motor voltage during startup, reducing the high inrush current typically associated with direct-on-line motor starting. This helps protect motors, couplings, belts and driven equipment from unnecessary wear while reducing supply voltage disturbances.

The integrated internal bypass relay design minimises heat losses after startup, improving overall energy efficiency and extending component lifespan inside industrial control cabinets. The compact DIN rail format also makes the unit ideal for machine builders and OEM automation systems.

Typical Applications

• Industrial conveyors and material handling systems.
• Pumps and water treatment systems.
• Fans and ventilation equipment.
• Small industrial induction motors.
• OEM automation systems and machinery.
• Packaging and process control equipment.

Trusted by Industrial Automation Engineers

Carlo Gavazzi RSE soft starters are widely used by machine builders and industrial engineers to provide reliable motor starting, reduced electrical stress and efficient induction motor control in compact automation systems.