Allen-Bradley 1489-M1C040 1-Pole 4A Type C Miniature Circuit Breaker

Description

Allen-Bradley 1489-M1C040 1-Pole 4A Type C Miniature Circuit Breaker

Product Dimensions：

The Allen-Bradley 1489-M1C040 is a high-performance Miniature Circuit Breaker (MCB) within the Bulletin 1489 product line. These devices are specifically designed as “Circuit Breakers for Branch Circuit Protection,” meeting the rigorous UL 489 standards for North American industrial applications.

Product Detailed Description

The 1489-M1C040 is a 1-Pole (1P), high-performance thermal-magnetic circuit breaker. It features a C-trip curve, which is designed for applications where there are medium magnetic inrush currents. Unlike “supplementary protectors” (UL 1077), the 1489 series is a fully rated Branch Circuit Protector, meaning it can be used to protect the entire branch of an electrical circuit.

Technical Parameters

Product Advantages

• UL 489 Listed: Approved for branch circuit protection in the US and Canada, eliminating the need for additional upstream protection in many designs.
• Dual Terminals: Features “finger-safe” IP20 terminals that allow for the connection of two wires, or a wire and a bus bar, simultaneously.
• Current Limiting: High-speed clearing of faults minimizes the “let-through” energy that could otherwise damage downstream components.
• Reversible Line/Load: Can be wired from either the top or the bottom, providing greater flexibility during panel wiring.
• Global Compliance: Carries UL, CSA, and CE markings, making it suitable for equipment intended for international export.

Important Considerations (Precautions)

• Trip Curve Selection: The C curve is suitable for most general industrial loads. However, for loads with extremely high inrush (like large transformers), a D curve might be required to prevent nuisance tripping.
• Environmental Derating: If installing multiple breakers side-by-side in a high-temperature enclosure, refer to the manufacturer’s derating charts as the ambient heat can affect the thermal trip point.
• DC Usage: While rated for 48 V DC, ensure the polarity and voltage limits are strictly observed for DC applications to ensure the internal arc-quenching mechanisms work correctly.

Product Applications

• Industrial Control Panels: Protecting PLC I/O, solenoids, and small motor circuits.
• Power Supplies: Acting as the primary branch protection for the input side of AC/DC power supplies.
• HVAC Systems: Protection for control heating elements and fan motors.
• Infrastructure: Used in telecommunications and transportation control systems where UL 489 branch protection is a regulatory requirement.

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