Legrand LEXIC Circuit Breaker - 407740 - C10A - 2-p
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Product Information
Full details
The Legrand DX3 circuit breaker is designed for reliable electrical protection in residential and commercial applications. It offers robust performance with a 'C' release characteristic, making it suitable for circuits with moderate inrush currents, and its dual-pole configuration ensures comprehensive circuit isolation. A key caveat is its incompatibility with ground fault elements, requiring separate protection for ground fault detection. This guide will help you understand its features, setup, and maintenance.
All features
| Series | DX3 |
|---|---|
| Model Part Number | 407740 |
| Brand | Legrand |
Extended Product Information
FAQs
What is the primary difference between a Type 'B' and Type 'C' circuit breaker?
A Type 'B' breaker trips between 3-5 times its rated current, suitable for purely resistive loads. A Type 'C' breaker trips between 5-10 times its rated current, making it suitable for circuits with moderate inductive loads or inrush currents, like small motors or lighting transformers.
Can I use this Legrand DX3 breaker with a ground fault detector?
No, this specific Legrand DX3 circuit breaker model (407740) is not compatible with ground fault elements. You will need to install a separate Residual Current Device (RCD) or Ground Fault Circuit Interrupter (GFCI) upstream of this breaker if ground fault protection is required.
What conductor sizes can be connected to this breaker?
This breaker can accommodate multi-wired conductors from 0.75 to 10 mm² and solid-core conductors from 0.75 to 16 mm².
How do I install auxiliary contacts on this breaker?
Auxiliary contacts for the DX3 series are designed to clip onto the side of the circuit breaker. Refer to the specific installation manual for the auxiliary contact model you are using, as wiring and mounting may vary slightly.
What does 'IP20' rating mean for this circuit breaker?
The IP20 rating signifies that the breaker is protected against solid objects larger than 12.5 mm (like a finger) and offers no protection against water. It should be installed in an enclosure to prevent accidental contact and exposure to moisture.
Is this circuit breaker suitable for outdoor use?
No, the IP20 rating indicates it is not protected against water ingress and is intended for indoor use within an electrical enclosure. Outdoor applications would require a higher IP rating and suitable environmental protection.
What is the rated short-circuit breaking capacity (Icn)?
The rated short-circuit breaking capacity (Icn) according to EN 60898 at 230 V is 6 kA. The rated ultimate short-circuit breaking capacity (Icu) according to IEC 60947-2 at 230 V is 10 kA.
Troubleshooting
Circuit breaker trips frequently
Check for overloaded circuits, excessive inrush current from connected devices, or potential short circuits. Verify conductor connections are secure and correctly sized. If the issue persists, consider if a higher-rated breaker or a different curve type is needed for the specific application, or if there's a fault within the connected equipment.
Breaker will not reset after tripping
Ensure the fault condition that caused the trip has been resolved. Check that the toggle switch is fully in the 'OFF' position before attempting to reset. If it still won't reset, the breaker may be damaged and require replacement.
No power to the circuit even when breaker is in 'ON' position
Verify that the main power supply is active. Check all incoming and outgoing conductor connections to the breaker for tightness. Test voltage at the breaker terminals to confirm power is present. If power is present at the terminals but not the circuit, the breaker itself may have failed internally.
Breaker feels warm to the touch during normal operation
Slight warmth can be normal under load, but excessive heat indicates a potential problem. Check for loose connections at the terminals, as this is a common cause of overheating. Ensure the breaker is not undersized for the continuous load. If heat persists, replace the breaker.
Pros and Cons
Pros
- Reliable protection for circuits with moderate inrush currents.
- Compact, single-module width saves space in electrical panels.
- Flexible connection options with pin or fork terminal rails.
- Supports auxiliary contacts for enhanced monitoring capabilities.
- Good short-circuit breaking capacity for general applications.
Cons
- Not compatible with ground fault elements, requiring separate GFCI/RCD protection.
- Only one pole is actively protected.
- Requires specific DX3 auxiliary contacts if monitoring is needed.
Setup, Compatibility & Care Instructions
Setup:
- Ensure the main power supply to the circuit is turned off.
- Mount the circuit breaker onto a standard DIN rail within an electrical enclosure.
- Connect the incoming power conductors to the appropriate terminals. The breaker is compatible with both pin and fork terminal rails.
- Connect the outgoing circuit conductors to the load terminals.
- If using auxiliary contacts, ensure they are correctly fitted and wired according to their specific instructions.
- For flush-mounted installations, ensure the enclosure is suitable and properly prepared.
- Turn the main power supply back on and test the circuit breaker by operating the toggle switch.
Compatibility:
- Terminal Rails: Compatible with pin and fork terminal rails.
- Auxiliary Contacts: Can be equipped with DX3 auxiliary contacts.
- Conductor Size: Suitable for multi-wired conductors from 0.75 to 10 mm² and solid-core conductors from 0.75 to 16 mm².
- Installation: Designed for flush-mounted installation on a DIN rail.
- Voltage: Rated for 230 V AC.
- Important Note: This circuit breaker is not compatible with ground fault elements. For ground fault protection, a separate Residual Current Device (RCD) or Ground Fault Circuit Interrupter (GFCI) must be installed upstream or in conjunction with this breaker.
Care:
- Cleaning: Keep the circuit breaker clean and free from dust and debris. Use a dry, lint-free cloth for cleaning. Do not use liquids or solvents.
- Inspection: Periodically inspect the circuit breaker for any signs of damage, overheating, or loose connections. Ensure the toggle operates smoothly.
- Environment: Operate within the specified ambient temperature range of -25 to 70 °C. Avoid environments with excessive moisture, dust, or corrosive substances. The IP20 rating means it should be protected from direct contact and solid objects larger than 12.5 mm.