UL489 5 A Miniature Circuit Breaker

The UL489 5 A Miniature Circuit Breaker is a compact, DIN-rail mounted circuit protection device certified under UL 489—primarily used for branch and feeder circuit protection in industrial, commercial, and residential installations. With a 5-amp rating and thermal-magnetic trip mechanism, it safeguards circuits from sustained overloads and short-circuits. Available in 1-pole, 2-pole, or 3-pole variants and offered with trip curves like B, C, or D, it delivers flexible protection tailored to diverse load characteristics. The device features current-limiting capabilities, trip‑free handle, and captive screws for reliable performance and easy installation 

Key Features

• 🔌 Rated Current: 5 A @ UL 489 — Ideal for branch circuit protection 

• ⚠️ Thermal-Magnetic Trip Unit — Provides delayed thermal protection for overloads and instantaneous magnetic response for short circuits 

• 🌀 Trip Curves B, C, D — C-curve (5–10×In), suitable for general use; B for resistive, D for high-inductive/motor loads 🔐 Current-Limiting Design — Interrupts fault current in under half a cycle, reducing energy let-through and system stress 

• 📏 Pole Configurations — Available in 1P, 2P (with neutral), and 3P/3P+N for three-phase systems 🛠️ Mechanical Reliability — Trip-free handle, captive screws, snap-on 35 mm DIN-rail mounting; toggle handle can be sealed in ON/OFF positions

• 💡 Interrupting Capacity — Standard 10 kA interrupt rating at 277/480 VAC (varies by device) 

• 🌡️ Operating Conditions — Rated for –35 °C to +70 °C (per IEC/UL standards); ambient derating applies 

• ✅ Certification & Safety Standards — UL489, CSA C22.2 No. 5, IEC 60947‑2, HACR/SWD rated, CE and RoHS compliant 

Typical Applications

• Branch circuit protection for lighting, receptacles, and HVAC systems

• Motor starter circuits and branch feeders

• Control panel and OEM equipment protection

• Industrial machinery and process control systems

• Electrical distribution in commercial/residential panels

Why Choose This UL489 5 A MCB?

• Branch Circuit Approval: Certified under UL489—authorized for feeder/branch protection under NEC 

• Adaptable Trip Curves: Selectable B, C, or D characteristics for tailored protection.

• Reduced Fault Impact: Current-limiting design minimizes energy let-through, protecting wiring and equipment.

• Safe & Convenient Installation: Trip-free operation, captive hardware, and DIN-rail mounting enhance safety and maintenance.

• Robust & Compliant: Withstand industrial environments and meet broad global