Hager MCS340 40A 3-Pole C-Curve Miniature Circuit Breaker, 6kA, 3 Modules

With a 6 kA short-circuit breaking capacity and a 40 A rated current, the Hager MCS340 delivers robust protection for demanding three-phase circuits. This 3-pole miniature circuit breaker (MCB) combines C-curve tripping with a compact 3-module design, making it a versatile choice for industrial and commercial installations.

Overview

The Hager MCS340 is engineered to safeguard cables and equipment against overloads and short circuits. Its C-curve characteristic ensures reliable tripping for moderate inrush currents, typical of motors, lighting, and general distribution. The breaker mounts on standard DIN rails and features screw terminals that accept rigid conductors up to 25 mm², ensuring secure and efficient wiring.

What stands out

• High 40 A rating with 6 kA breaking capacity for dependable protection.
• 3-pole configuration isolates all phases simultaneously for complete circuit interruption.
• C-curve tripping handles moderate inrush currents without nuisance tripping.
• Compact 3-module width (52.5 mm) saves valuable panel space.
• Wide operating temperature range from -25°C to +70°C for harsh environments.
• Compliant with EN 60898-1, ensuring safety and performance standards.

Technical details

• Rated current: 40 A
• Number of poles: 3
• Tripping characteristic: C
• Rated voltage: 230/400 V AC
• Rated short-circuit breaking capacity (Icn): 6 kA
• Frequency: 50/60 Hz
• Module width: 3 modules (52.5 mm)
• Mounting: DIN rail
• Terminal capacity: 1-25 mm² rigid, 1-16 mm² flexible
• Connection type: Screw terminals
• Degree of protection: IP20 (terminals), IP40 (front face in enclosure)
• Electrical endurance: 10,000 cycles
• Mechanical endurance: 20,000 cycles
• Operating temperature: -25°C to +70°C
• Standard: EN 60898-1

Our verdict

The Hager MCS340 is a high-performance MCB that excels in three-phase applications. Its combination of high current rating, reliable C-curve protection, and compact footprint makes it an excellent choice for panel builders and electricians seeking dependable circuit protection without sacrificing space.