ABB S203U-K4 Miniature Circuit Breaker
- 4A
- 3 Pole
- DIN Rail
Quantity
ABB S203U-K4 - 4A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Built for demanding commercial environments, the ABB S203U-K4 provides reliable branch circuit protection. This 3-pole, 4A miniature circuit breaker is designed to handle inductive loads with its specialized K-curve thermal-magnetic trip. It installs easily into standard DIN rail enclosures and control panels. This unit serves as a legacy replacement for the SU203M-K4. Rated for a 10kA interrupting capacity at 240VAC, this breaker features current-limiting technology to minimize fault damage.Specifications
| Brand | ABB |
|---|---|
| Series | S200U |
| Amperage | 4A |
| Poles | 3 |
| Mounting Style | DIN Rail |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | S203 |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | DIN Rail Panels, Control Panels |
| Wire Gauge | 18-4 AWG |
| Max Wire | 4 AWG |
| Min Wire | 18 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Curve | K |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Bell Alarm, Shunt Trip, Busbar System, Rotary Handle, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, UL |
| Temp Rating | -25C to 55C |
| Construction Features | Current Limiting, Reverse Feed, Trip-Free Mechanism, Common Trip |
Product FAQs
6 answersWhat applications are best suited for the K trip curve on the S203U-K4?
The K curve is optimized for highly inductive loads with significant inrush currents, such as motors and transformers. Its magnetic trip threshold is 10 to 14 times the rated current, preventing nuisance tripping during startup.
Is the S200U series rated for branch circuit protection?
Yes. The S200U series is UL 489 listed for branch circuit protection, making it suitable for primary overcurrent protection rather than just supplementary protection.
What is the recommended terminal torque for the S203U-K4?
The box lug terminals require a tightening torque of 25 in-lbs (2.8 Nm).
Is the ABB S203U-K4 suitable for reverse feeding?
Yes, this breaker can be reverse fed, allowing flexibility in wiring the line and load connections.
Which accessory line works with the S203U-K4?
This breaker accepts ABB System pro M compact accessories, which include auxiliary contacts, bell alarms, and shunt trips.
What is the touch protection rating on the terminals?
The breaker features IP20 finger-safe terminals, reducing the risk of accidental contact with live parts during maintenance.
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