ABB SU203M-K10 Miniature Circuit Breaker
- 10A
- 3 Pole
- DIN Rail
Quantity
ABB SU203M-K10 - 10A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Built for demanding motor control environments, this 10-amp three-pole breaker provides reliable branch circuit protection. It serves as an effective safeguard for industrial machinery. The compact design installs easily into standard DIN rail enclosures. It functions as an exact replacement for the legacy S203U-K10 model. Featuring a K-curve trip profile, it handles high inrush currents without nuisance tripping.Specifications
| Brand | ABB |
|---|---|
| Series | SU203M |
| Amperage | 10A |
| Poles | 3 |
| Mounting Style | DIN Rail |
| Voltage | 480Y/277VAC, 96VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 480Y/277VAC, 10kA @ 96VDC |
| Terminal Type | Screw/Clamp Terminal |
|---|---|
| For Use With | DIN Rail Enclosures, 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, Signal Contact, Shunt Trip, Undervoltage Release, Padlock Attachment, Busbar System |
|---|---|
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CCC, CE, CSA, IEC, UL, VDE |
| Temp Rating | -25C to 55C |
| Construction Features | Current Limiting, Reverse Feed, Common Trip, RoHS Compliant |
Product FAQs
5 answersWhat applications are best suited for the K curve trip characteristic?
The K curve magnetic trip threshold is set between 10 and 14 times the rated current. This allows the breaker to tolerate high inrush currents without nuisance tripping, making it ideal for protecting motors, transformers, and inductive loads.
What is the recommended terminal tightening torque for this breaker?
The screw clamp terminals should be tightened to 2.8 Nm (25 in-lbs). ABB recommends using a Pozidriv 2 screwdriver for proper terminal seating.
What type of DIN rail is required for mounting?
The breaker is designed to snap onto standard 35mm DIN rail. It is compatible with both TH35-7.5 (35 x 7.5 mm) and TH35-15 (35 x 15 mm) mounting rails.
What accessories can be added to the SU203M-K10?
It integrates with ABB System pro M compact UL 489 accessories. Panel builders can add auxiliary contacts, signal contacts, shunt trips, undervoltage releases, and motor operating devices to extend functionality.
How does the fixed thermal magnetic trip unit operate during a fault?
The trip unit uses a bimetal thermal element to detect and open the circuit during sustained overloads. A separate magnetic element responds instantaneously to clear severe short circuits, providing comprehensive overcurrent protection.
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