Schneider Electric M9F42120 - 20A, 1-Pole, Circuit Breaker

The Schneider Electric M9F42120 is a dependable 20A, 1-Pole circuit breaker designed to deliver precise overcurrent protection in demanding electrical environments. Built for flexible integration, its 1-Pole configuration makes it an adaptable choice for a variety of panel installations while maintaining compact, reliable performance.

Core specifications at a glance

• Current rating: 20A
• Poles: 1-Pole
• Breaker type: Circuit Breaker

What makes this 1-Pole breaker uniquely valuable

• Flexible use in panelboards, switchboards, and control panels, enabling streamlined protection across different electrical architectures.
• Designed for industrial, commercial, and OEM applications where dependable overcurrent protection is critical for safe operation in distribution panels and motor control centers.
• Trusted Schneider Electric engineering ensures consistent trip characteristics and reliable performance in demanding environments.

Ideal use scenarios

• Distributing power safely in distribution panels and motor control centers (MCCs) where single-pole protection suits the circuit topology.
• Upgrading or replacing aging protection devices in panelboards within manufacturing floors, facilities, and commercial spaces.
• OEM equipment enclosures that require compact, straightforward overcurrent protection without sacrificing safety or reliability.

Why it matters for your operation

With the M9F42120, you deploy targeted protection that responds quickly to overloads and short circuits, helping to prevent wiring damage, equipment failures, and unexpected downtime. The 1-Pole format reduces footprint in tight spaces while maintaining robust protection for single-phase circuits common in control and auxiliary systems. This translates into safer operation, easier maintenance, and smoother continuity for critical processes.

Practical considerations and tips

• Ensure compatibility with your panelboard or switchboard’s mounting and busbar configuration when selecting a single-pole device.
• Pair with matching Schneider Electric protective devices to maintain a coherent, compliant protection scheme across the distribution system.
• Ideal for retrofits and OEM builds where space and reliability are both at a premium.