ABB Miniature circuit breaker - S203-C25NA
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Tameson UKAbb System Pro M Compact Circuit Breaker - 2Cds253103r0254
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Product Information
Full details
The ABB S203-C25NA miniature circuit breaker is designed for reliable overload and short-circuit protection in residential, commercial, and industrial settings. It offers robust safety with its dual tripping mechanisms and compliance with international standards. A key benefit is its current-limiting capability, minimizing damage during fault events. However, users should be aware that it requires professional installation and understanding of electrical codes for safe operation.
All features
| Series | S203 |
|---|---|
| Model Part Number | 2CDS253103R0254 |
| Brand | ABB |
Extended Product Information
FAQs
What is the rated breaking capacity of the S203-C25NA?
The rated short-circuit breaking capacity (Icu) according to IEC 60947-2 is 20kA at 230V AC and 10kA at 400V AC. According to EN 60898-1, the rated short-circuit breaking capacity (Icn) is 6kA at 230V/400V AC.
Can this circuit breaker be used for DC circuits?
Yes, it is rated for DC voltage applications up to 110V.
What does 'Type C' tripping characteristic mean?
A Type C breaker is designed to trip when the current reaches 5 to 10 times the rated current. This makes it suitable for circuits with moderate inductive or capacitive loads that experience brief, higher current surges upon energization.
How many poles does this circuit breaker have?
The S203-C25NA is a 4-pole (4P) circuit breaker, meaning it protects three live conductors and the neutral conductor.
What is the maximum current rating for this breaker?
The rated current for this specific model (S203-C25NA) is 25A.
Can I add accessories like auxiliary contacts to this breaker?
Yes, additional equipment such as auxiliary contacts can be mounted on the S200 series breakers, with bottom-fitting options available that save space.
What are the environmental operating limits?
The breaker can operate within an ambient temperature range of -25°C to 55°C.
Troubleshooting
Breaker trips immediately upon reset
This indicates a short circuit. Disconnect all loads and test the circuit. If the breaker still trips with no load connected, the breaker itself may be faulty.
Breaker trips intermittently during normal operation
This may be due to an overload condition or a load with a high inrush current. Check connected devices for excessive power draw or consider if the load's inrush current exceeds the Type C characteristic. Ensure conductor connections are secure.
Breaker does not trip during a fault condition
This is a critical safety issue. Immediately disconnect power and have the breaker replaced by a qualified electrician. Do not attempt to repair.
Visible damage to the breaker
If the breaker casing is cracked or shows signs of overheating, disconnect power and replace the unit immediately.
Pros and Cons
Pros
- Provides reliable protection against both overloads and short circuits.
- Current-limiting feature enhances safety and reduces equipment damage.
- Type C characteristic is versatile for various load types.
- Robust construction with Metal and Plastic materials ensures durability.
- Compliant with multiple international safety standards.
Cons
- Requires professional installation due to its electrical nature.
- IP20 degree of protection means it's not suitable for dusty or wet environments without additional enclosure.
- Potential for nuisance tripping if connected loads have very high inrush currents exceeding Type C limits.
- Additional auxiliary contacts are not included and must be purchased separately if needed.
Setup, Compatibility & Care
Setup: Installation should only be performed by a qualified electrician. The circuit breaker mounts onto a standard DIN rail. Ensure that the main power is disconnected before attempting any wiring.
Compatibility: This breaker is compatible with AC systems up to 400V and DC systems up to 110V. It is designed for use with conductor cross-sections ranging from 0 to 35mm² (solid-core) and 0 to 25mm² (multi-wired).
Care: Minimal care is required. Ensure the breaker is free from dust and debris. Avoid physical impact. The breaker's internal mechanisms are sealed and do not require user maintenance. Periodic inspection of the connection terminals for tightness is recommended during routine electrical system checks.