The **1490-R** series refers to a specific line of **Bus Bars** and power distribution accessories manufactured by **Allen-Bradley (Rockwell Automation)**. These components are designed to work in conjunction with miniature circuit breakers (MCBs) to simplify wiring and enhance safety within electrical control panels. --- ### 1. Overview of 1490-R Components The 1490-R line is primarily used for the distribution of power across multiple circuit breakers without the need for complex "daisy-chain" wiring. This reduces labor time and minimizes the risk of loose connections. | Feature | Description | |:---|:---| | **Primary Function** | Power distribution bus for circuit breakers. | | **Compatibility** | Typically used with Bulletin 1489-M or 1492-SP circuit breakers. | | **Voltage Ratings** | Supports both AC and DC applications (often up to 600V AC/DC). | | **Phases** | Available in 1-phase, 2-phase, and 3-phase configurations. | --- ### 2. Key Technical Specifications These parts are engineered to meet UL 508 and CSA standards for industrial control equipment. * **Current Capacity:** Usually rated for **80A to 100A**, depending on the specific model and power feed method. * **Pitch/Spacing:** Standard 17.5mm spacing to align perfectly with standard DIN-rail mounted breakers. * **Material:** High-conductivity copper bars encased in a rigid, heat-resistant plastic housing (Polyamide). * **Cut-to-Length:** Most 1490-R bus bars are designed to be cut to size, though they require specific **End Caps** to maintain insulation integrity after cutting. --- ### 3. Common Model Breakdown The suffix of the part number determines the physical configuration of the bus bar: | Part Number Type | Configuration | Common Use Case | |:---|:---|:---| | **1490-R1...** | 1-Pole (Single Phase) | Standard 120V or DC distribution. | | **1490-R2...** | 2-Pole (Two Phase) | 240V AC circuits or split-phase systems. | | **1490-R3...** | 3-Pole (Three Phase) | Industrial 480V/208V 3-phase motor circuits. | | **1490-R-TE** | Terminal Lug | Used to feed power into the bus bar from a larger wire. | | **1490-R-EC** | End Cap | Protective insulator for the ends of the bus bar. | --- ### 4. Installation Example To install a 1490-R system, an electrician follows this logic: 1. **Mount:** Click the required number of circuit breakers onto a DIN rail. 2. **Align:** Slide the 1490-R bus bar into the "bus" side of the breaker terminals. 3. **Secure:** Tighten the terminal screws to the manufacturer's specified torque. 4. **Feed:** Use a **1490-R-TL** (Terminal Lug) to connect the main incoming power line to the bus. ---