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This Schneider Electric C120N is a three-pole, low-voltage miniature circuit breaker designed for robust protection in industrial and domestic applications. It offers reliable overcurrent protection with a C-characteristic trip curve and a substantial 10kA breaking capacity, safeguarding circuits from faults. While it provides dual compliance for broad usability, users should be aware of its specific voltage and current ratings to ensure appropriate application.
| Series | C120N |
|---|---|
| Model Part Number | A9N18369 |
| Brand | Schneider Electric |
Type C breakers are designed to trip between 5 to 10 times their rated current, suitable for loads with moderate inrush currents like lighting and socket circuits. Type D breakers trip between 10 to 20 times their rated current, designed for high inrush current loads such as large motors or transformers.
This indicates the maximum fault current the circuit breaker can safely interrupt without being destroyed. A 10kA (10,000 Amperes) rating at 380-415VAC means it can safely interrupt short circuits up to this level, protecting the downstream circuit and preventing further damage.
The primary rating is for AC circuits (220/415 VAC). While some IEC standards cover DC applications, this specific model's documentation primarily focuses on AC performance. For DC applications, consult Schneider Electric for specific product recommendations and ratings.
The breaker has a mechanical lifetime of 20,000 operating cycles (switching on and off) and an electrical lifetime of 5,000 operating cycles under rated load conditions.
A 3-pole breaker is necessary for protecting three-phase electrical systems, ensuring all three phases are disconnected simultaneously during a fault condition to prevent phase imbalance or damage to three-phase equipment.
IP20 means the breaker is protected against solid objects greater than 12.5 mm in diameter (like fingers) and has no protection against water ingress. It should be installed in a dry, protected enclosure.
Compliance certificates, such as EN/IEC 60947-2 and IEC 60898-1, are typically listed on the product's datasheet or the manufacturer's official website. This model also complies with RoHS directives.
Check for overloaded circuits or short circuits. Verify that the connected load does not exceed the breaker's 125A rating. Ensure the trip curve (Type C) is appropriate for the connected equipment's inrush current. Inspect wiring for loose connections.
Ensure the fault condition that caused the trip has been resolved. If the fault persists, the breaker may be damaged and require replacement. If it's a persistent trip without an obvious fault, contact a qualified electrician.
Manually operate the breaker switch to confirm its mechanical function. If the indicator is stuck or misaligned, the breaker may require replacement. Ensure the breaker is correctly seated on the DIN rail.
Immediately de-energize the circuit. Check and tighten the terminal connections. If signs of melting or significant discoloration are present, the breaker or wiring may be damaged and require professional assessment and replacement.
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