Miniature Circuit Breaker Schneider Electric A9F04320 — 20 A, 133 V, 10 kA, IP20, 54×78.5×91 mm

Schneider Electric A9F04320 is a miniature circuit breaker designed for overcurrent protection in low-voltage electrical installations. With a rated current of 20 A and a rated voltage of 133 V, this compact device provides reliable interruption of fault currents up to a breaking capacity of 10 kA. The unit's IP20 protection rating and small footprint (54×78.5×91 mm) make it suitable for installation in distribution panels, industrial control cabinets and commercial or residential electrical systems where space is limited.

Advantages

The breaker combines a high breaking capacity with a compact form factor, allowing effective protection of circuits while occupying minimal panel space. IP20 protection ensures safe handling in standard indoor electrical enclosures. The specified electrical ratings — 20 A current and 133 V voltage — match common low-voltage applications, and the device is designed for integration into modular distribution systems and DIN-rail mounting arrangements.

Suitable for

• Overcurrent protection of lighting and power circuits in residential and commercial premises
• Distribution panels and sub-distribution boards with limited space
• Industrial control cabinets where compact protective devices are required
• Low-voltage circuits requiring a breaking capacity up to 10 kA

Key specifications

• Rated current: 20 A
• Rated voltage: 133 V
• Breaking capacity: 10,000 A (10 kA)
• Protection degree: IP20
• Physical dimensions: 54 mm (width) × 78.5 mm (depth) × 91 mm (height)
• Form factor: miniature circuit breaker for modular installations

How to use

Install the circuit breaker on a compatible DIN rail inside a protected electrical enclosure, ensuring the supply is switched off before wiring. Connect the line and load conductors to the designated terminals following applicable wiring diagrams and local electrical codes. Verify tightness of terminal connections and correct polarity where required. After installation, switch the breaker to the ON position and test the protected circuit under controlled conditions to confirm correct operation.

Recommendations

Use this breaker as part of a coordinated protection scheme: select upstream and downstream protective devices with compatible characteristics, respect conductor current-carrying capacities, and perform periodic visual inspections and functional tests according to local standards and maintenance schedules.