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RSBT4025EV21S258 – 3 phase compressor softstarter 400V 25A, 110-400V
Carlo Gavazzi RSBT4025EV21S258 three-phase compressor soft starter with 25 A rated current, integrated bypass and alarm relay output designed for scroll compressor motor starting control.
Why Choose the Carlo Gavazzi RSBT4025EV21S258 Soft Starter?
The Carlo Gavazzi RSBT4025EV21S258 is a compact three-phase soft starter for scroll compressors designed to reduce starting current and provide smooth acceleration of compressor motors in HVAC, refrigeration and industrial cooling applications. As part of the advanced Carlo Gavazzi RSBT soft starter series, it provides reliable compressor starting control with integrated bypass technology, alarm relay output and DIN rail mounting for efficient installation.
This soft starter helps reduce electrical inrush current, mechanical stress and vibration during compressor startup. The RSBT series uses advanced current limiting control to optimise starting performance while maintaining reliable operation in demanding industrial environments.
With a rated current of 25 A, an operating voltage range of 187–440 V AC and a 110–400 V AC control voltage range, the RSBT4025EV21S258 is designed for three-phase scroll compressor applications requiring dependable starting performance and alarm monitoring capability.
Key Advantages
- Compact three-phase scroll compressor soft starter for HVAC and industrial applications.
- 25 A rated operational current suitable for higher-capacity compressor systems.
- 187–440 V AC three-phase operation for flexible compressor installations.
- Integrated alarm relay output supports system monitoring and fault indication.
- Integrated bypass relay improves efficiency during normal operation.
- DIN rail mounting enables simple installation inside control cabinets.
Key Features
- Carlo Gavazzi RSBT three-phase compressor soft starter series.
- 25 A rated operational current.
- 187–440 V AC operating voltage.
- 110–400 V AC control voltage.
- Three-phase controlled starting for scroll compressors.
- Integrated internal bypass relay.
- Relay output for alarm indication.
- Compact 45 mm wide DIN rail mounting design.
Reliable Compressor Starting Control
Soft starters such as the Carlo Gavazzi RSBT4025EV21S258 control the initial current supplied to compressor motors during startup. By limiting starting current and providing controlled acceleration, they help improve system reliability while reducing stress on electrical and mechanical components.
The RSBT series is specifically developed for three-phase scroll compressor applications. Its integrated bypass function, alarm capability and compact construction allow reliable integration into HVAC systems, refrigeration equipment and industrial control panels.
Typical Applications
- Three-phase scroll compressors.
- HVAC refrigeration systems.
- Commercial cooling equipment.
- Heat pump systems.
- Industrial compressor applications.
- OEM climate control and automation equipment.
Technical Specifications
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| Motor Protection | No | |
|---|---|---|
| Current | 25 A | |
| Power | 11 kW | |
| Voltage | 230 V, 400 V | |
| Phase | Three Phase | |
| Coil / Supply Voltage | 110–400 V AC | |
| Manufacturer | Carlo Gavazzi | |
| Series | RSBT Scroll Compressor Soft Starters | |
| Model | RSBT4025EV21S258 | |
| Product type | Three-phase compressor soft starter | |
| Rated operational current | 25 A | |
| Operating voltage | 187–440 V AC | |
| Control voltage | 110–400 V AC | |
| Input phases | 3-phase | |
| Frequency | 50 / 60 Hz | |
| Rated motor power at 230 V AC | 5.5 kW | |
| Rated motor power at 400 V AC | 11 kW | |
| Starting method | Current limiting soft start | |
| Controlled phases | 3-phase | |
| Internal bypass | Yes | |
| Alarm output | Relay output | |
| Protection rating | IP20 | |
| Mounting type | DIN rail mounting | |
| Dimensions (W × H × D) | 45 × 125 × 103.5 mm |
Frequently Asked Questions
What is the Carlo Gavazzi RSBT4025EV21S258 used for?
This soft starter is designed to control the starting of three-phase scroll compressors by reducing starting current and mechanical stress.
What current rating does the RSBT4025EV21S258 provide?
The RSBT4025EV21S258 has a rated operational current of 25 A.
What supply voltage does the RSBT4025EV21S258 require?
The RSBT4025EV21S258 operates from a 187–440 V AC three-phase supply with a 110–400 V AC control voltage.
Does the RSBT4025EV21S258 provide alarm monitoring?
Yes, the RSBT4025EV21S258 includes a relay output for alarms to support system monitoring.
Where is the RSBT4025EV21S258 installed?
The soft starter is typically installed inside HVAC control panels, compressor cabinets and industrial electrical enclosures using DIN rail mounting.
Trusted by HVAC and Automation Engineers
Carlo Gavazzi RSBT soft starters are used by HVAC manufacturers and automation engineers to provide reliable compressor starting, reduced electrical stress and efficient system operation.
