ABB S201U-K1 Miniature Circuit Breaker
- 1A
- 1 Pole
- DIN Rail
Quantity
ABB S201U-K1 - 1A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Manufactured by ABB, this miniature circuit breaker is engineered for commercial and industrial motor control applications. It provides reliable branch circuit protection for systems requiring precise thermal-magnetic responses. The unit installs into standard DIN rail control panels. As part of the legacy S200U series, it is officially replaced by the newer SU201M-K1 model for future upgrades. Rated 10kAIC at 240VAC, it features a K-curve trip profile for inductive loads.Specifications
| Brand | ABB |
|---|---|
| Series | S200U |
| Amperage | 1A |
| Poles | 1 |
| Mounting Style | DIN Rail |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | S201 |
|---|---|
| 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 |
Product FAQs
6 answersWhat type of loads is the K trip curve designed to protect?
The K curve is engineered for inductive loads that experience high inrush currents, such as motors and transformers. It features a magnetic trip threshold of 8 to 12 times the rated current to prevent nuisance tripping during normal equipment startup.
Does the S201U-K1 meet requirements for branch circuit protection?
Yes. As part of the S200U series, this breaker is UL 489 listed. This means it is fully rated for primary branch circuit protection, unlike UL 1077 devices which are only rated for supplementary protection.
What is the acceptable wire size range for the terminals on this breaker?
The box lugs are designed to accommodate conductors ranging from 18 AWG to 4 AWG. Always verify that your wire size matches the load requirements and is torqued to the manufacturer specifications.
Does this breaker require a specific mounting rail?
Yes, it is designed to mount on a standard 35mm DIN rail commonly found in industrial control panels and automation enclosures.
How does the thermal magnetic trip mechanism operate in this breaker?
The thermal element provides long-time delay protection against sustained overloads, while the magnetic element provides instantaneous protection against short circuits.
Why is the UL 489 rating critical for panel builders using this breaker?
A UL 489 listing ensures the breaker can safely interrupt fault currents and protect the branch circuit wiring itself. Substituting a UL 1077 supplementary protector in a branch circuit position violates electrical codes and compromises panel safety.
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