ABB S203M-C20 3-Pole 20A Type C Miniature Circuit Breaker
The ABB S203M‑C20 is a compact, 3‑pole miniature circuit breaker designed for reliable overload and short‑circuit protection across residential, commercial, marine, and light rail panels in the UAE. Its current‑limiting design, twin terminals with captive screws, and bottom‑fixing auxiliary contact simplify installation and save panel space.
Key features
- Type: Miniature Circuit Breaker (MCB)
- Poles: 3
- Tripping mechanisms: Delayed thermal (overload); Electromechanical (short circuit)
- Breaking capacity: 10 kA / 15 kA
- Current rating: 20 A
- Voltage: 400 V
- Unique features: Patented twin terminals with captive screws
- Installation: Bottom‑fixing auxiliary contact for space and time savings
- Global compatibility: Designed to meet worldwide standards for cross‑market use
- Accessory compatibility: Wide range of control/monitoring accessories supported
Technical specifications
| Parameter |
Value |
| Type |
3‑pole miniature circuit breaker (Type C) |
| Current rating |
20 A |
| Voltage |
400 V |
| Tripping mechanisms |
Delayed thermal (overload); Electromechanical (short‑circuit) |
| Breaking capacity |
10 kA / 15 kA |
| Terminals |
Patented twin terminals with captive screws |
| Mounting/auxiliary contact |
Bottom‑fixing auxiliary contact |
Applications
- Residential distribution boards and consumer mains
- Commercial electrical panels and switchboards
- Maritime electrical systems and coastal environments
- Railway and light rail infrastructure control panels
- Industrial protection in UAE facilities
FAQ
-
What's the difference between an MCB and an RCCB/RCD?
An MCB (miniature circuit breaker) protects wiring and connected equipment against overload and short-circuit current. An RCCB/RCD protects against earth leakage by monitoring current imbalance. The two are complementary and are normally installed together in a distribution board.
-
What does the Type C tripping curve mean?
Type C trips at 5–10x rated current, giving enough headroom for motors, transformers, and ballast/LED-driver inrush without nuisance tripping.
-
What does the 10kA breaking capacity mean?
10kA is the maximum fault current this MCB can safely interrupt without damage. It should be equal to or higher than the prospective fault current at its installation point in the board.
-
How many poles do I need?
A 3-pole (3P) breaker switches all three phases on a three-phase circuit without a switched neutral.
-
Is this MCB compatible with other ABB DIN-rail distribution boards?
Yes — it's a standard DIN-rail (EN 60715) mounted breaker and clips directly into ABB's modular consumer units and distribution boards alongside other ABB DIN-rail devices.
-
Can I install this myself?
No. This is a distribution board component and must be installed and connected by a licensed electrician in accordance with UAE wiring regulations — it is not a DIY consumer product.
