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IMO UB10C300.5A 0.5A 3-Pole C-Curve Miniature Circuit Breaker: UL 489, 10kA
The IMO Precision Controls UB10C300.5A miniature circuit breaker provides 0.5A, 3-pole thermo-magnetic overcurrent protection for industrial control panels and electrical distribution systems. It features a C-curve trip characteristic, 10kA short-circuit breaking capacity, DIN rail mounting and UL 489 approval for branch circuit device protection.
⚡ 0.5A Branch Circuit & Equipment Protection
The
IMO UB10C300.5A is designed to protect electrical circuits against overloads and short circuits. Its 3-pole configuration makes it suitable for applications that require simultaneous protection across three poles, while its DIN rail design allows straightforward installation inside industrial control panels and distribution systems.
Reliable 3-Pole Circuit Protection for Industrial Control Panels
The IMO Precision Controls UB10C300.5A combines thermal overload protection with instantaneous magnetic tripping in a compact miniature circuit breaker. This thermo-magnetic design responds to sustained overcurrent conditions while providing rapid fault isolation when a short circuit occurs. With a rated current of 0.5A and a 10kA short-circuit breaking capacity, the breaker is designed for protecting low-current circuits in industrial electrical systems.
Its C-curve trip characteristic is suited to circuits that experience moderate inrush current during startup, including small motor control circuits and transformers. The breaker also features a contact position indicator for convenient visual status identification. UL 489 approval allows the UB10C300.5A to be used for branch circuit device protection where its electrical ratings meet the application requirements.
⚡ 0.5 Amp Rated Current
Designed for low-current electrical circuits requiring 0.5A overcurrent protection
🔌 3-Pole Configuration
Provides three-pole circuit protection in a single DIN rail mounted breaker
📈 C-Curve Trip Characteristic
5–10 × In magnetic trip range for circuits with moderate startup or inrush current
🛡️ 10kA Breaking Capacity
Rated for a short-circuit breaking capacity of 10kA
Key Features & Benefits
- 0.5A Miniature Circuit Breaker: Provides overcurrent protection for low-current industrial and electrical circuits
- 3-Pole Design: Protects three poles within one compact circuit breaker
- C-Curve Trip Characteristic: Designed for circuits with moderate inrush currents, including small motor control circuits and transformers
- Thermo-Magnetic Protection: Combines thermal overload protection with instantaneous magnetic short-circuit tripping
- 10kA Short-Circuit Breaking Capacity: Provides rapid circuit interruption during high fault-current conditions
- Branch Circuit Device Protection: UL 489 approved for qualifying branch circuit applications
- Contact Position Indicator: Provides a convenient visual indication of breaker contact status
- DIN Rail Mountable: Designed for installation in industrial control panels and electrical distribution systems
- 480Y/277VAC Rating: Supports electrical systems operating within the breaker's specified voltage rating
- Multiple Approvals: UL 489, IEC 60947-2 and IEC 60898-1 compliant; RoHS compliant
Specifications
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Part Number
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UB10C300.5A
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Brand
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IMO Precision Controls
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Product Type
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Miniature Circuit Breaker (MCB)
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Rated Current
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0.5 Amp
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Voltage Rating
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480Y / 277VAC
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Number of Poles
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3
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Tripping Curve
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C-Curve (5–10 × In)
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Short-Circuit Breaking Capacity
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10kA
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Rated Operational Frequency
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50/60 Hz
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Calibration Temperature
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104°F (40°C)
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Operating Temperature
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-13°F to 131°F (-25°C to 55°C)
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Mechanical Lifespan
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20,000 Operations
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Electrical Lifespan
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6,000 Operations
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Vibration Resistance
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±1mm @ 5–25 Hz; 50 m/s² @ 25–150 Hz
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Fastening Torque
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2.5 Nm (22.2 lb-in)
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Wire Range
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18–3 AWG
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NEMA / IP Rating
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NEMA 1 / IP20
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IP20 Protection
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Protection against solid objects 12.5mm (0.5") in diameter or greater
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Mounting
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DIN Rail
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Dimensions
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4.25" L x 2.06" W x 2.64" D (108mm x 52.5mm x 67mm)
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Approvals
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UL 489, IEC 60947-2, IEC 60898-1, RoHS Compliant
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✅ UL 489 Branch Circuit Protection
The UB10C300.5A is
UL 489 approved and can be used for branch circuit device protection when its current, voltage, interrupting capacity and other ratings meet the requirements of the electrical system.
📈 When to Choose a C-Curve Breaker
A
C-curve miniature circuit breaker is designed for circuits that may experience moderate inrush current during startup. The UB10C300.5A has a magnetic trip characteristic of 5–10 × In, making it suitable for applications such as small motor control circuits and transformers when the breaker's other ratings match the load.
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