F&F ST25-20M Modular Contactor with Manual Control 25A 2NO

The F&F ST25-20M is a high-quality modular contactor engineered for the reliable switching of electrical circuits in both residential and industrial environments. This device is designed for standard DIN-rail mounting and provides a rated current of 25A with 2NO (normally open) contacts. A standout feature of this model is the integrated manual control switch, which offers users the flexibility to perform local operations or system testing without needing to engage the automated control signal.

Advantages

The primary benefit of this modular contactor is its versatility in handling various electrical loads, including lighting, heating, and motor circuits. The inclusion of a manual override switch significantly simplifies maintenance and troubleshooting processes, allowing for direct intervention when necessary. Its compact modular design ensures it fits seamlessly into standard distribution boards alongside other DIN-rail components, promoting a clean and organized electrical installation.

Suitable for

• Lighting control systems in residential and commercial buildings
• Heating and ventilation circuit management
• Motor control applications requiring reliable switching
• Manual override testing in automated electrical systems

When it may not be suitable

This contactor is not intended for use in environments with extreme moisture or high levels of dust unless housed in an appropriate protective enclosure. It is also not suitable for switching circuits that exceed its 25A rated capacity or for applications requiring specific safety certifications not covered by standard modular contactor specifications.

Key specifications

• Rated current: 25A
• Contact configuration: 2NO (normally open)
• Mounting type: DIN-rail
• Control type: Automatic with manual override

How to use

Installation should be performed by a qualified professional in accordance with local electrical regulations. The device snaps directly onto a standard 35mm DIN-rail within a distribution cabinet. Once mounted, connect the power supply and load cables to the designated terminals. The manual switch on the front panel allows you to toggle the contactor state manually for testing purposes or during maintenance, provided the system is safely isolated.

What to consider before purchase

• Ensure the 25A rating is sufficient for your specific load requirements
• Verify that the 2NO contact configuration matches your circuit design
• Confirm that your distribution board has sufficient space for a modular DIN-rail device

Usage recommendations

For optimal performance and longevity, ensure that all terminal connections are tightened to the manufacturer's specified torque and that the device is protected from excessive heat within the distribution board.