F&F BIS-404 Sequential Impulse Relay 5A 230V AC 2Z

The F&F BIS-404 sequential impulse relay is a specialized electrical component engineered for advanced lighting control systems. Operating at 230V AC with a maximum current capacity of 5A, this device features two normally open (2Z) contacts. It is designed to facilitate the sequential switching of electrical circuits, providing a reliable method for managing multi-stage lighting installations in both residential and commercial environments.

Advantages

The primary benefit of the BIS-404 is its ability to perform sequential switching, which allows for complex lighting scenarios to be managed through simple impulse signals. By utilizing two independent contacts, the relay enables the activation of different lighting groups in a specific order, enhancing energy efficiency and user convenience. Its robust construction ensures long-term operational stability, while the standard 230V AC compatibility allows for seamless integration into existing electrical infrastructures without the need for additional power supplies.

Suitable for

• Multi-stage lighting control in residential homes
• Commercial office lighting management
• Sequential activation of decorative or architectural lighting
• Automation of lighting circuits requiring step-by-step switching

This relay may not be suitable for high-power industrial machinery or circuits exceeding the 5A current limit. It is also not intended for use in DC voltage systems or applications requiring continuous high-frequency switching beyond its mechanical design specifications.

Key specifications

• Operating voltage: 230V AC
• Maximum current: 5A
• Contact configuration: 2 normally open (2Z) contacts
• Function: Sequential impulse switching

To use the F&F BIS-404, the device must be installed by a qualified electrician into a standard electrical distribution board. The control input should be connected to a momentary push-button switch, which sends an impulse to the relay. Each subsequent press of the button advances the relay to the next state, toggling the contacts according to the internal sequential logic. Ensure all wiring is secured firmly to the terminals to prevent overheating or poor connectivity.

What to consider before purchase

• Verify that the total load of the lighting circuits does not exceed the 5A limit
• Ensure the installation space is compatible with standard DIN-rail mounting
• Confirm that the control system utilizes momentary impulse switches

For optimal performance and safety, always ensure that the electrical circuit is de-energized before installation. Regularly inspect the relay terminals for signs of wear or loose connections to maintain system reliability.