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

Schneider Electric M9F42120 Circuit Breaker is a 20 A, 1-pole device designed for industrial electrical service, maintenance, and replacement projects. Built by Schneider Electric, it provides dependable overcurrent protection for individual circuits within panelboards and control systems.

To ensure the right fit and performance, verify compatibility by the part number M9F42120 against your equipment requirements. If you’re unsure about compatibility, message us and we'll help confirm the match and answer questions about your application.

Why the M9F42120 stands out

• Single-pole design delivers targeted protection for individual industrial circuits, helping minimize downtime and protect equipment.
• Optimized for straightforward replacement in compatible panels and systems, supporting efficient maintenance and upgrades.
• Reliability you can count on from Schneider Electric, a trusted name in electrical protection and system reliability.
• Part-number based compatibility check ensures you’re selecting the correct breaker for your specific application, reducing guessing and return trips.

Ideal use cases

• Replacement of worn or failed breakers in industrial control panels and distribution panels
• New installations requiring robust 20 A protection for dedicated circuits in industrial environments
• Maintenance projects where reliable, easy-to-source circuit protection is essential

Specifications at a glance

• Product Type: Circuit Breaker
• Amperage: 20 A
• Poles: 1
• Manufacturer: Schneider Electric
• Part Number: M9F42120

Remember: Verify fit by part number and application requirements. If you need help matching a part number or confirming compatibility, send us a message and we’ll assist with your exact industrial application.