Purchase now: Schneider Electric A9F73332 Miniature Breaker
Purchase now: Atlantech Drives provides you the Schneider Electric A9F73332, a reliable 3-pole **Miniature Circuit Breaker (MCB)** from the premium **Acti9 iC60N** range. Rated at **32 Amps**, this breaker is distinguished by its **Curve B** tripping characteristic. Unlike the standard Curve C, Curve B is designed to trip faster on short circuits (between 3 and 5 times the nominal current), making it critical for protecting circuits with long cable runs or sensitive equipment like generators.
Technical Specifications and VisiSafe
The A9F73332 offers a breaking capacity of **6000 A** (IEC 60898-1) for residential/commercial use and **10 kA** (IEC 60947-2) for industrial applications at 400V. It features Schneider’s **VisiSafe** green strip, which physically guarantees the contacts are open during maintenance. The **VisiTrip** window turns red to indicate a fault trip, allowing for instant diagnostics separate from a manual switch-off.
- Part Number: A9F73332.
- Range: Acti9 iC60N.
- Poles: 3P.
- Rated Current: 32 A.
- Curve: Type B (Magnetic trip 3-5 x In).
- Breaking Capacity: 6 kA / 10 kA.
- Voltage: 400 V AC.
- Width: 54 mm (6 modules of 9mm).
- Life: 20,000 mechanical cycles.
Expert Tips: When to use Curve B?
Curve C is the default, so why buy Curve B? Expert Tip: Use the A9F73332 (Curve B) when the loop impedance is high (long cables) or the source impedance is high (small generators/UPS). In these scenarios, a short circuit current might not be high enough to trigger a Curve C breaker instantly, leading to melted cables. Curve B ensures safety by tripping at lower fault currents (96A – 160A for this 32A model).
Frequently Asked Questions (FAQs)
Q: Can I use this for motor protection?
A: Generally **No**. The inrush current of a motor (typically 5-7x In) will likely nuisance-trip a Curve B breaker instantly. Use Curve C or D (or a specific Motor Breaker like GV2) for motors.
Q: Is it compatible with Vigi add-on blocks?
A: Yes, you can clip on an **Acti9 Vigi iC60** module to add earth leakage protection (RCD) directly to this breaker, saving DIN rail space.
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