RSBT4025EV11 - 3 phase compressor softstarter 400V 25A, 110-400V I/P

Why Choose the Carlo Gavazzi RSBT4025EV11 Scroll Compressor Soft Starter?

The Carlo Gavazzi RSBT4025EV11 is a compact and intelligent three-phase scroll compressor soft starter engineered specifically for HVAC and refrigeration systems operating on higher voltage networks. As part of the advanced Carlo Gavazzi RSBT soft starter series, this unit helps reduce compressor starting current, minimise voltage disturbances and improve compressor operational lifespan in demanding commercial and industrial environments.

Featuring a patented auto-adaptive starting algorithm, integrated bypass relays and built-in diagnostic protection functions, the RSBT4025EV11 automatically optimises compressor startup performance without requiring manual programming or commissioning adjustments. Its compact DIN rail mounting format makes it ideal for HVAC control cabinets, chillers, rooftop units, heat pumps and refrigeration systems.

With a rated operational current of 25 A and support for 220–400 V AC three-phase systems, this soft starter is specifically developed for scroll compressor motor applications where reducing inrush current and improving system reliability are critical. The integrated 110–400 V AC control voltage enables seamless integration into industrial and commercial HVAC control systems.

Key Advantages

• Designed specifically for three-phase scroll compressor applications.
• 25 A operational current suitable for HVAC compressor systems.
• Patented auto-adaptive algorithm for optimised compressor startup.
• Integrated bypass relays reduce heat dissipation inside control panels.
• Reduces voltage fluctuations and compressor mechanical stress.
• Compact DIN rail mounting design for HVAC control cabinets.

Key Features

• Carlo Gavazzi RSBT soft starter series.
• 25 A rated operational current.
• 220–400 V AC three-phase operational voltage.
• 110–400 V AC control voltage.
• Patented auto-adaptive compressor starting algorithm.
• 3-phase controlled soft starting solution.
• Integrated internal bypass relays.
• Integrated diagnostic functions including locked rotor protection.
• Short startup ramp time below 600 ms.
• Compact DIN rail mounting format.

Technical Specifications

• Manufacturer: Carlo Gavazzi
• Series: RSBT Scroll Compressor Soft Starters
• Model: RSBT4025EV11
• Product type: Three-phase compressor soft starter
• Rated operational current: 25 A
• Operational voltage: 220–400 V AC
• Rated motor power at 230 V: 5.5 kW
• Rated motor power at 400 V: 11 kW
• Control voltage: 110–400 V AC
• Controlled phases: 3-phase
• Frequency: 50 / 60 Hz
• Starting algorithm: Auto-adaptive patented algorithm
• Integrated bypass: Yes
• Protection functions: Over-temperature, overcurrent and locked rotor protection
• Mounting type: DIN rail mounting
• Protection rating: IP20
• Dimensions (W × H × D): 45 × 125 × 81 mm
• Operating temperature: -20 °C to +55 °C
• Application type: Scroll compressors and HVAC systems

Advanced Soft Starting for Scroll Compressors

Scroll compressors typically generate high inrush currents during direct-on-line startup, often reaching six to eight times the compressor rated current. The Carlo Gavazzi RSBT4025EV11 reduces these starting currents using an intelligent self-learning algorithm that automatically adapts to the connected compressor.

This helps minimise light flickering, voltage disturbances and mechanical stress while improving compressor reliability and overall HVAC system efficiency. The integrated bypass relay design also reduces internal panel heat dissipation for improved long-term operational performance.

Typical Applications

• Commercial air conditioning systems.
• Industrial refrigeration equipment.
• Heat pump systems.
• HVAC compressor control panels.
• Chiller and cooling systems.
• Scroll compressor motor starting applications.

Trusted by HVAC Engineers Worldwide

Carlo Gavazzi RSBT compressor soft starters are widely used in HVAC and refrigeration systems where reduced compressor inrush current, reliable startup performance and improved equipment lifespan are essential.