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IMO UB10C1040A 40A UL 489 Miniature Circuit Breaker, 1-Pole, C Curve, 10kA
40A single-pole UL 489 miniature circuit breaker with C-curve thermo-magnetic protection, 10kA interrupting capacity, and DIN-rail mounting.
Why Choose the IMO UB10C1040A Circuit Breaker?
The IMO Precision Controls UB10C1040A is a 40A single-pole miniature circuit breaker for industrial machinery and distribution branches whose conductor, load, and upstream protection design calls for a 40A breaker. It provides branch-circuit protection at up to 277V AC or 48V DC and mounts on DIN rail for efficient integration into industrial control and distribution panels.
Thermo-magnetic operation combines delayed thermal response for overload protection with fast magnetic response during severe faults. The C-curve trip characteristic responds at 5–10 times rated current, making the breaker suitable for correctly engineered circuits with moderate inrush, while its contact-position indicator supports visual status checks.
⚡ 40A Rating
Protects a correctly sized single-pole branch circuit rated for 40A
📉 C Trip Curve
5–10 × In magnetic trip range accommodates moderate equipment inrush
🛡️ 10kA Capacity
Provides a 10kA short-circuit breaking capacity for suitable systems
✅ UL 489 Approved
Approved for branch-circuit protection when applied within its ratings
⚠️ Coordinate the Breaker with the Entire Circuit
Do not select a breaker from amperage alone. Verify the 40A rating against conductor current, equipment requirements, system voltage, available fault current, pole count, trip curve, ambient conditions, and applicable electrical codes before installation.
📋 How the C-Curve Trip Characteristic Works
The thermal element responds to sustained overloads, while the magnetic element trips rapidly during high fault current. For this 40A breaker, the C-curve instantaneous magnetic range is specified at 5–10 times rated current. Confirm coordination with load inrush and upstream/downstream protective devices.
Key Features & Benefits
- Single-pole DIN-rail mounting design
- Thermo-magnetic overload and short-circuit protection
- 277V AC / 48V DC voltage rating
- Contact-position indicator for visual status checks
- 18–3 AWG conductor range
- 20,000 mechanical and 6,000 electrical operations
- UL 489, IEC 60947-2, IEC 60898-1, and RoHS compliance
Technical Specifications
| Dimensions |
4.25" Length x 0.69" Width x 2.64" Depth (108mm x 17.5mm x 67mm) |
| Rated Current |
40 Amp |
| Voltage Rating |
277V AC / 48V DC |
| Number of Poles |
1 |
| 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/s2 @ 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 |
📋 Circuit-Breaker Selection and Installation Overview
1. Calculate the Load: Confirm that the circuit design and conductor current are compatible with a 40A protective device.
2. Verify System Ratings: Check voltage, frequency, available fault current, and required interrupting capacity.
3. Confirm Trip Behavior: Make sure the C curve is appropriate for the load’s normal startup or inrush current.
4. Install Correctly: Mount on DIN rail and follow the specified conductor range and 2.5 Nm terminal torque.
5. Test and Document: Verify operation, labeling, coordination, and compliance before energizing the protected circuit.
Circuit-breaker selection and installation must be completed by qualified personnel in accordance with the equipment documentation and applicable electrical codes.
🏭 Typical Uses for the 40A Breaker
• Industrial machinery branch circuits
• Control-panel power-distribution sections
• Appropriately sized equipment feeders
• Branch circuits requiring a 40A UL 489 breaker
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