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IMO UB10C3050A 50A UL 489 Circuit Breaker, 3-pole, C Curve, 10kA
50A 3-pole C-curve miniature circuit breaker with thermo-magnetic protection, 10kA breaking capacity, DIN-rail mounting, and UL 489 approval.
Why Choose the IMO UB10C3050A Circuit Breaker?
The IMO Precision Controls UB10C3050A is a 50A 3-pole miniature circuit breaker for higher-capacity three-phase equipment and distribution branches whose conductor and load design specifies 50A protection. It is rated for 480Y/277V AC and provides UL 489 branch-circuit protection in industrial control panels, machinery, and distribution equipment when applied within its electrical ratings.
Thermo-magnetic operation combines a thermal response for sustained overloads with rapid magnetic response during severe faults. The C curve accommodates moderate equipment inrush while still responding rapidly to severe faults. A contact-position indicator provides a clear visual reference during inspection and troubleshooting.
ā” 50A Rating
Protects a correctly sized 3-pole branch circuit rated for 50A
š C Trip Curve
5ā10 Ć In magnetic range supports loads with moderate startup current
š”ļø 10kA Capacity
Provides 10kA short-circuit breaking capacity for suitable electrical systems
ā
UL 489 Approved
Approved for branch-circuit protection when selected and installed correctly
ā ļø Coordinate the 50A 3-pole Breaker with the Load
Confirm the 50A rating, 3-pole configuration, conductor current, 480Y/277V AC rating, available fault current, C trip curve, ambient conditions, and equipment requirements before installation.
š 50A C-Curve Magnetic Trip Range
The C-curve magnetic element operates at 5ā10 times rated current. For the UB10C3050A, this corresponds to an instantaneous magnetic range of approximately 250ā500A. The thermal element responds to sustained overloads. Confirm coordination with normal startup current and upstream or downstream protective devices.
Key Features & Benefits
- 3-pole DIN-rail mounting configuration
- Rated for 480Y/277V AC
- Approximate magnetic trip range of 250ā500A
- Thermo-magnetic overload and short-circuit protection
- Contact-position indicator for visual status checks
- 18ā3 AWG conductor range with 2.5 Nm fastening torque
- UL 489, IEC 60947-2, IEC 60898-1, and RoHS compliance
Technical Specifications
| Dimensions |
4.25" Length x 2.06" Width x 2.64" Depth (108mm x 52.5mm x 67mm) |
| Rated Current |
50 Amp |
| Voltage Rating |
480Y / 277V AC |
| Number of Poles |
3 |
| Tripping Curve |
C (5-10 In) |
| Calibration Temperature |
104 F (40 C) |
| Operating Temperature |
-13 F to 131 F (-25 C to 55 C) |
| Rated Operational Frequency |
50/60 Hz |
| Short Circuit Breaking Capacity |
10kA |
| Lifespan |
20,000 Operations (Mechanical), 6000 Operations (Electrical) |
| Vibration Resistance |
+/- 1mm @ 5-25 Hz; 50 m/sĀ² @ 25-150 Hz |
| Fastening Torque |
2.5 Nm (22.2 lb/in) |
| Wire Range |
18-3 AWG |
| NEMA Rating |
NEMA 1 (IP20 - Protection from objects 12.5 mm (0.5") in diameter or greater) |
| Approvals |
UL 489, IEC 60947-2 & IEC 60898-1, RoHS Compliant |
š 3-pole Breaker Selection and Installation Overview
1. Calculate the Load: Confirm that conductor current and connected equipment are compatible with a 50A protective device.
2. Verify Pole and Voltage Requirements: Confirm that the circuit requires 3 poles and operates within the 480Y/277V AC rating.
3. Check Fault and Inrush Current: Verify the available fault current, 10kA breaking capacity, and compatibility of the C curve with normal startup demand.
4. Mount and Terminate: Install on DIN rail using conductors within the specified 18ā3 AWG range and apply the listed 2.5 Nm terminal torque.
5. Inspect Before Energizing: Verify wiring, labeling, protective-device coordination, and code compliance before commissioning.
Circuit-breaker selection and installation must be completed by qualified personnel in accordance with the equipment documentation and applicable electrical codes.
š Typical Uses for the 50A 3-pole C-Curve Breaker
ā¢ Higher-capacity three-phase machinery
ā¢ Industrial control-panel distribution sections
ā¢ Appropriately sized equipment feeders
ā¢ Three-pole AC branches requiring 50A C-curve protection
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