ABB S281UC-K1 Miniature Circuit Breaker
- 1A
- 1 Pole
- DIN Rail
Quantity
ABB S281UC-K1 - 1A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Designed for demanding industrial control applications, the S280UC series provides versatile UL 1077 supplementary protection. This 1A, single-pole breaker safely handles both AC and DC voltages with a specialized K-curve trip. It mounts securely onto standard DIN rail enclosures. As a legacy component, it serves as an exact replacement for older systems, while new builds use the S201MUC-K1. To safely interrupt DC faults, it incorporates a permanent magnet for rapid arc extinguishing.Specifications
| Brand | ABB |
|---|---|
| Part Number | S281UC-K1 |
| Series | S280UC |
| Amperage | 1A |
| Poles | 1 |
| Mounting Style | DIN Rail |
| Voltage | 277VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 277VAC, 4.5kA @ 250VDC |
| Terminal Type | Box Lugs |
|---|---|
| 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 | Shunt Trip, Auxiliary Switch, Undervoltage Release, Busbar System |
|---|---|
| Standards | CSA C22.2 No. 235, IEC 60947-2, UL 1077, VDE 0660 |
| Approval | CE, CSA, IEC, UL, VDE |
| Temp Rating | -25C to 55C |
| Construction Features | Current Limiting |
Product FAQs
7 answersWhat makes the ABB S280UC series different from standard miniature circuit breakers?
The S280UC series is designed for universal current (UC) applications, safely handling both AC and DC voltages. It features a built-in permanent magnet that forces the rapid extinguishing of electrical arcs during DC faults.
Does polarity matter when installing the ABB S281UC-K1 in a DC circuit?
Yes. Because this breaker uses a permanent magnet to extinguish DC arcs, you must strictly observe the correct polarity and current flow direction during installation. Reversing the polarity can prevent the breaker from safely clearing a DC fault.
What does the K trip curve indicate on the S281UC-K1?
The K curve is engineered for loads with high inrush currents, such as motors and transformers. It allows the breaker to ride through momentary surges by tripping at 10 to 14 times the rated current, preventing nuisance tripping.
Is the ABB S281UC-K1 suitable for new panel builds?
While the S281UC-K1 serves as an exact replacement for legacy systems, ABB recommends the S201MUC-K1 for new installations requiring 1-pole, 1A universal current protection.
What standards does the ABB S281UC-K1 meet for circuit protection?
This breaker is a UL 1077 recognized supplementary protector. It is intended for use within equipment or appliances where branch circuit overcurrent protection is already provided or is not required.
Can the S281UC-K1 be used to protect sensitive semiconductor devices?
No. The K curve is designed for high inrush loads. For sensitive electronics and semiconductors, a Z curve breaker is required because it has a much lower instantaneous trip threshold.
Does the S281UC-K1 offer protection against accidental contact?
Yes, the breaker features extended, insulated terminals that provide an IP20 protection rating. This finger-safe design helps prevent accidental contact with live electrical components during maintenance.
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