ABB SU203M-K8 Miniature Circuit Breaker
- 8A
- 3 Pole
- DIN Rail
Quantity
ABB SU203M-K8 - 8A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Part of the S200 series, this 8A miniature breaker provides robust branch circuit protection for commercial and industrial motor control applications. It mounts easily onto standard DIN rail systems and serves as an exact substitute for the older S203U-K8 model. Delivering a 10kA interrupting rating at 480Y/277VAC, the unit features a K-curve trip profile to accommodate high inrush loads, alongside real contact position indication and finger-safe terminals.Specifications
| Brand | ABB |
|---|---|
| Series | SU203M |
| Amperage | 8A |
| 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
7 answersWhat does the K trip curve signify on the SU203M-K8?
The K curve provides an instantaneous trip at 8 to 14 times the 8A rated current. It is specifically designed for industrial loads with high inrush currents, such as motors and transformers, preventing nuisance tripping while maintaining sensitive cable protection.
Is the ABB SU203M-K8 rated for primary branch circuit protection?
Yes, this breaker is UL489 listed. Unlike UL1077 supplementary protectors, it is fully approved for primary branch circuit protection in control panels and distribution systems.
Can the SU203M-K8 be used in DC control circuits?
Yes, this breaker is dual-rated for both AC and DC systems. It provides a 10kA interrupting capacity at up to 96VDC, making it suitable for DC control panels and automation equipment.
What wire sizes are accepted by the terminals on this breaker?
The multi-function screw terminals are designed to accept copper conductors ranging from 18 AWG to 4 AWG.
How is the SU203M-K8 mounted inside an enclosure?
This miniature circuit breaker is designed for tool-free installation and snaps directly onto a standard 35mm DIN rail.
How can I verify the contact status of this breaker?
The SU203M series features a real contact position indicator (CPI). The toggle displays a clear red window when the contacts are closed (ON) and a green window when they are open (OFF), ensuring safe maintenance.
Is the SU203M-K8 compatible with ABB modular accessories?
Yes, it is fully compatible with the ABB System pro M compact accessory ecosystem. This allows panel builders to easily add snap-on auxiliary contacts, shunt trips, and undervoltage releases.
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