Circuit breaker Schneider Electric 3-pole B curve 40 A 6 kA AC K60N (A9K01340)

Schneider Electric three-pole miniature circuit breaker K60N with B-characteristic tripping curve and rated current 40 A provides overload and short-circuit protection for low-voltage electrical installations. The device is intended for AC networks and offers a breaking capacity of 6 kA, making it suitable for residential and light commercial distribution boards. The compact design allows DIN-rail mounting and easy integration into modular switchgear assemblies while maintaining coordination with downstream protective devices.

Advantages

The B curve ensures fast tripping on moderate short-circuit currents while avoiding nuisance trips from motor starting or transient inrush currents typical in domestic and small commercial applications. The three-pole configuration provides simultaneous disconnection of all phases for improved safety and easier wiring. Robust construction and standardized footprint simplify replacement and installation in existing distribution panels.

Suitable for

• Protection of three-phase lighting and socket circuits in homes and apartments
• Overload and short-circuit protection in small offices and light commercial premises
• Use in distribution boards and modular DIN-rail systems
• Coordination with downstream protective devices in group circuits

Key specifications

• Poles: 3 (three-pole)
• Tripping curve: B characteristic
• Rated current: 40 A
• Breaking capacity: 6 kA AC
• Application: low-voltage AC distribution
• Mounting: DIN-rail compatible

How to use

Install the circuit breaker on a standard DIN-rail inside an appropriately rated distribution board. Ensure the supply is isolated before connecting conductors and follow local wiring regulations for conductor sizing and torque settings. Connect incoming and outgoing three-phase conductors to the corresponding terminals, verify correct orientation, and label circuits as required. After installation, restore supply and perform basic functional checks: confirm mechanical switching operation and verify that the device trips under a controlled test condition or according to commissioning procedures.

Usage recommendations

Select conductor cross-sections and coordination with upstream and downstream protective devices to match the 40 A rated current and 6 kA breaking capacity. Avoid using the device in networks with prospective short-circuit currents exceeding its breaking capacity. Periodically inspect terminals for tightness and signs of overheating and follow Schneider Electric documentation for maintenance intervals and replacement criteria.