Circuit breaker Legrand 412940 — 20 A, 100/400 V, white

Legrand 412940 is a single-pole circuit breaker rated at 20 A with an operating voltage range of 100–400 V. Designed for installation in distribution boards, this white-finished protective device monitors current flow and trips when overloads or short circuits occur, helping to protect wiring and connected equipment in residential and light-commercial electrical systems.

Advantages

This single-pole circuit breaker offers reliable overcurrent protection within a 100–400 V operating range and a 20 A nominal current rating. Its compact, standardized form factor fits common DIN-rail distribution boards and facilitates straightforward replacement or retrofitting. The device’s white finish provides a neutral appearance that integrates with typical panel layouts, while its simple mechanical operation delivers predictable and repeatable tripping performance for everyday circuit protection tasks.

Suitable for

• Protection of lighting and socket circuits in homes
• Overcurrent protection for small office or light-commercial installations
• Use in single-phase distribution boards and subpanels
• Replacement of like-for-like single-pole breakers

Key specifications

• Poles: single-pole (1P)
• Rated current: 20 A
• Operating voltage range: 100–400 V
• Tripping function: overcurrent/short-circuit protection (thermal/magnetic or equivalent mechanical trip)
• Mounting: DIN-rail compatible housing for distribution boards
• Finish: white
• Typical application environment: residential and light-commercial electrical circuits

How to use

Install the circuit breaker on a compatible DIN rail inside the distribution board following local electrical codes and safety practices. Connect the supply and load conductors to the designated line and load terminals, ensuring correct tightening torque and secure conductor termination. Verify the breaker’s orientation and that the panel is de-energized during installation. After wiring, restore power and test the circuit by switching the breaker on and off and verifying that protected circuits operate normally; perform a trip test only when safe and in accordance with relevant procedures.

Usage recommendations

Select this 20 A single-pole breaker for circuits whose expected continuous current does not exceed the rated value and where the voltage falls within 100–400 V. Do not exceed the rated current, and ensure coordination with upstream and downstream protective devices. Have installation, commissioning, and any troubleshooting performed by a qualified electrician and follow national wiring regulations and Legrand installation guidance where applicable.