Circuit breaker Hager SBN390 3 module 100A 440V

The Hager SBN390 circuit breaker is a compact, three-module protective device rated for 100 A with a maximum coil voltage of 440 V. With dimensions of 52.5 mm width, 68 mm depth and 83 mm height, it is designed to fit standard distribution boards and modular enclosures. The device interrupts current in case of overloads or short circuits and helps maintain continuity and safety of electrical installations in residential, commercial and light industrial environments.

Advantages

The circuit breaker combines a high current rating with a small footprint, allowing efficient use of panel space while delivering 100 A protection. Its construction supports reliable tripping performance for overload and short-circuit conditions, and the modular 3-module format simplifies installation and replacement in common DIN-rail systems. The rated coil voltage of up to 440 V ensures compatibility with a range of AC control circuits.

Suitable for

• Protection of branch circuits in residential electrical distribution
• Use in commercial premises and small workshops
• Integration into control panels and modular switchboards
• Replacement of existing modular breakers with same form factor

Key specifications

• Number of modules: 3-module (standard modular width)
• Rated current: 100 A
• Maximum coil/control voltage: 440 V
• Dimensions (W×D×H): 52.5 × 68 × 83 mm
• Function: overload and short-circuit interruption
• Mounting: DIN-rail compatible modular mounting

How to use

Install the breaker on a standard DIN rail inside the distribution board, ensuring the device is oriented correctly and secured. Connect the line and load conductors to the appropriate terminals, observing torque recommendations from the installation standard and ensuring conductors are sized for 100 A service. Verify control/coil wiring is compatible with the specified maximum voltage before energizing. After installation, perform standard insulation and continuity checks and test the breaker operation under controlled conditions.

Recommendations

Use qualified personnel for installation and maintenance. Ensure upstream and downstream protective devices and conductor sizes are matched to the 100 A rating to prevent nuisance tripping or overheating. Periodically inspect terminals for tightness and signs of wear or corrosion, and follow local regulations and electrical codes for testing intervals and recordkeeping.