Hager SFT125 Modular Changeover Switch 25A 1P

The Hager SFT125 is a high-quality 1-pole modular changeover switch designed for precise and reliable electrical circuit management. Engineered for a rated current of 25A and an operating voltage of 230V, this device provides a robust solution for manually switching between two distinct power sources or electrical circuits. Its compact design is specifically optimized for standard DIN-rail mounting within electrical distribution boards, making it an essential component for maintaining power continuity in residential and commercial environments.

Advantages

This modular changeover switch offers exceptional build quality and operational reliability, ensuring long-term performance in demanding electrical installations. The device facilitates seamless manual control, allowing users to safely transition between a primary power supply and an alternative source, such as a generator or secondary grid connection. Its standardized modular format ensures compatibility with most modern electrical enclosures, simplifying the installation process for professionals and ensuring a clean, organized setup within the distribution panel.

Suitable for

• Manual switching between main power and backup generator sources
• Selecting between two different electrical circuits in a single-phase system
• Residential electrical distribution boards
• Commercial and light industrial power management setups

When it may not be suitable

This device is not intended for automatic power transfer applications, as it requires manual intervention to change positions. It is also not suitable for three-phase electrical systems, as it is designed exclusively for single-pole, single-phase operations.

Key specifications

• Rated current: 25A
• Number of poles: 1
• Rated operating voltage: 230V AC
• Mounting type: DIN-rail
• Switching positions: I-0-II

How to use

The Hager SFT125 should be installed by a qualified electrician within a standard electrical enclosure on a DIN rail. Once mounted, the input terminals are connected to the respective power sources, and the output terminal is connected to the load circuit. The switch features a clear three-position toggle (I-0-II), where position I connects the first source, position 0 is the neutral off-state, and position II connects the second source.

What to consider before purchase

• Verify that your electrical system is single-phase, as this switch is not compatible with three-phase setups
• Ensure the 25A current rating is sufficient for the total load of the circuits being switched
• Check the available space on your DIN rail within the distribution board

Usage recommendations

Always ensure the power is disconnected before performing any wiring or maintenance on the switch. Regularly inspect the connections to ensure they remain tight and free from oxidation to maintain optimal electrical conductivity.