Circuit breaker accessory Hager KDN363B — 3-phase connection rail / busbar, for 57 modules

Hager KDN363B is a circuit breaker accessory designed as a 3-phase connection rail (busbar) for distribution boards with up to 57 modular positions. It provides a prefabricated conductive link between breakers to facilitate three-phase power distribution and reduce wiring time during installation. The product is intended for use in residential and light-commercial electrical panels where standardized modular breakers are mounted side by side.

Advantages

The connection rail offers consistent electrical contact across three phases and simplifies the common supply of multiple breakers without individual conductor runs. Its modular length matches enclosures with up to 57 module spaces, reducing the need for custom busbar fabrication. The accessory is compatible with Hager modular devices and is intended to streamline installation while maintaining an organized panel layout.

Suitable for (tasks / use cases)

• Establishing a three-phase common supply for modular circuit breakers in distribution boards
• Retrofit or new installations in residential and small commercial electrical panels
• Situations where quick, repeatable connections between breakers are required to save time

When it may not be suitable

This connection rail is intended for use with modular breakers and enclosures compatible with a 57-module length; it may not be appropriate for custom panels, non-modular switchgear, or installations requiring bespoke busbars with different mechanical layouts. For applications requiring higher current ratings, different phase spacing, or additional protective features, a different busbar design or a dedicated distribution solution may be necessary.

Key specifications

• Phase configuration: 3-phase busbar
• Compatibility: fits distribution boards up to 57 modular positions
• Function: conductive connection between modular circuit breakers
• Mounting style: intended for side-by-side modular breaker installation
• Purpose: simplifies three-phase power distribution and installation workflow

How to use

Mount the Hager 3-phase connection rail across the row of modular breakers in a distribution board with up to 57 module positions, following the enclosure manufacturer's mounting guidelines and Hager compatibility recommendations. Ensure all breakers are in the OFF position and the supply is isolated before installing. Position the rail so that its contact points align with the breaker terminals, secure it per the panel design, and verify mechanical stability and electrical continuity before restoring power. Installation should be performed by a qualified electrician in accordance with local electrical codes.

What to consider before purchase

• Confirm the distribution board module count and that a 57-module length is suitable
• Verify compatibility with the specific type and model of modular breakers used
• Check required current rating and phase arrangement for your installation
• Ensure installation will be performed by a qualified professional and meets local regulations

Usage recommendations

Use the Hager KDN363B busbar in standard modular panels to reduce wiring time and maintain uniform connections. Always isolate power before fitting, verify alignment with breaker contacts, and perform continuity and insulation checks after installation.