ABB Circuit Breaker - SN201 - 20A Curve B
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Product Information
Full details
This guide is for electricians and system designers working with electrical distribution systems. The ABB SN201 miniature circuit breaker (MCB) offers reliable protection against overloads and short circuits for circuits, especially those with long cable lengths in TN and IT systems. A key benefit is its single-module, 1P+N design for efficient space utilization. However, users should note its specific Type B tripping characteristic, which is designed for certain load types.
All features
| Series | SN201 |
|---|---|
| Model Part Number | 2CSS255101R0205 |
| Brand | ABB |
Extended Product Information
FAQs
What is the primary function of the ABB SN201 MCB?
The ABB SN201 MCB is designed to protect electrical circuits against overcurrents, specifically overload and short-circuit conditions.
What does '1P+N' mean for this circuit breaker?
'1P+N' signifies that the circuit breaker switches both the live (phase) conductor and the neutral conductor simultaneously, making it a single-module device for single-phase circuits.
When is a 'Type B' tripping characteristic most suitable?
A Type B tripping characteristic is generally suitable for circuits with low inrush currents, such as resistive loads, lighting, and standard socket outlets. It trips at a lower multiple of its rated current compared to Type C or D breakers.
What is the degree of protection for the housing and terminals?
The housing has a degree of protection of IP40, protecting against solid objects larger than 1mm. The terminals have a degree of protection of IP20, protecting against accidental contact with live parts.
Can this circuit breaker be used in three-phase systems?
No, the SN201 MCB described is a 1P+N (single-pole + neutral) device, intended for single-phase circuits only. Three-phase applications require different types of circuit breakers.
How do I reset the circuit breaker after it has tripped?
To reset the circuit breaker after it has tripped, first identify and rectify the cause of the fault (e.g., overload or short circuit). Then, simply flip the operating lever back to the 'ON' position.
Troubleshooting
MCB trips frequently during normal operation.
Check for overloaded circuits. Ensure the connected load does not exceed the 20A rating. Verify the tripping characteristic (Type B) is suitable for the load type, as high inrush currents could cause nuisance tripping.
MCB does not trip when a fault is simulated.
Ensure the MCB is correctly wired and energized. If the issue persists, the unit may be faulty and requires replacement. Perform tests only by qualified personnel.
Device appears loose on the DIN rail.
Ensure the DIN rail is correctly installed and the MCB's mounting clip is securely engaged. Check that the DIN rail is properly secured within the enclosure.
Pros and Cons
Pros
- Compact single-module design saves DIN rail space.
- Provides essential protection against overloads and short circuits.
- Suitable for specific applications requiring Type B tripping (low inrush currents).
- Easy installation with standard DIN rail mounting.
- Durable construction with good ingress protection ratings.
Cons
- Type B characteristic may not be suitable for inductive loads with high inrush currents.
- Limited to 1P+N configuration, not suitable for 3-phase applications.
- Not designed for direct integration with smart home systems without additional interfaces.
- Specific applications may require different tripping characteristics (e.g., Type C or D).
Setup, Compatibility & Care
Setup:
- Mounting: Securely attach the SN201 MCB to a standard 35mm DIN rail within an electrical enclosure.
- Wiring: Connect the line conductor to the designated input terminal and the neutral conductor to the N terminal. Ensure all connections are tight and follow local electrical codes.
- Load Connection: Connect the outgoing circuit conductors to the respective output terminals.
Compatibility:
The SN201 series is designed for use in final distribution boards. It is compatible with TN and IT earthing systems. Ensure the rated current (20A) and tripping characteristic (Type B) are appropriate for the protected circuit's load.
Care:
- Cleaning: Periodically inspect the breaker for dust and debris. Clean the exterior with a dry or slightly damp cloth. Ensure the device is de-energized before cleaning.
- Operation: Test the tripping function periodically as per local regulations or manufacturer recommendations to ensure continued reliability.