Description
The ABB RT1S Thermal Overload Relay is a motor protection device designed for compatible C-2000 IEC contactors and motor starters. With an adjustable current range of 14.5 to 18 A, it helps protect motors against sustained overload conditions by detecting excessive current and initiating a trip through the connected starter control circuit.
Designed for industrial motor control applications, the RT1S features a thermal protection mechanism with a Class 10 trip characteristic. Its ambient-compensated design helps maintain consistent overload protection under varying ambient temperatures, while its differential mechanism provides sensitivity to single-phase operating conditions.
The RT1S supports Type 2 coordination when used with compatible C-2000 contactors and starters and the specified Class J fuse protection. It is suitable for motor control panels and industrial equipment where dependable overload protection and coordinated short-circuit protection are required.
Key Features
- Adjustable Current Range: Provides overload protection settings from 14.5 to 18 A for compatible motor applications.
- Thermal Overload Protection: Helps protect motors against sustained excessive current.
- Class 10 Trip Characteristic: Provides a Class 10 overload response for suitable motor protection applications.
- C-2000 Compatibility: Designed for compatible ABB C-2000 IEC contactors and motor starters.
- Type 2 Coordination: Supports coordinated protection when used with the specified starter assembly and Class J fuses.
- Class J Fuse Coordination: Specifies LPJ-SP or AJT fuses with a maximum rating of 35 A for the documented coordination arrangement.
- Ambient Compensation: Helps maintain overload protection performance as ambient temperature varies within the specified operating conditions.
- Single-Phase Sensitivity: The differential mechanism helps detect phase-related current imbalances under applicable conditions.
- Trip Indication: Provides visible indication of an overload trip for easier troubleshooting.
- Reset Options: Supports configurable manual or automatic reset modes, subject to the relay’s specifications.
Specifications
| Technical Specification | Detail |
|---|---|
| Product Model | RT1S |
| Catalog Number | RT1S |
| Brand / Manufacturer | ABB |
| Product Family | C-2000 IEC Contactors and Starters |
| Product Type | Thermal Overload Relay |
| Adjustable Current Range | 14.5–18 A |
| Trip Class | Class 10 |
| Number of Poles | 3 |
| Protection Function | Thermal Motor Overload Protection |
| Coordination Type | Type 2, with the specified compatible starter and fuse combination |
| Compatible Fuse Class | Class J |
| Specified Fuse Types | LPJ-SP or AJT |
| Maximum Fuse Rating for Specified Coordination | 35 A |
| Reset Options | Manual or Automatic, depending on configuration |
| Trip Indication | Visible Trip Indication |
| Compatible Contactors | Compatible C-2000 contactors, including specified CL00, CL01, CL02, CL04, CL25, and CL45 models |
| UPC | 801701813712 |
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