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Automatic Testing Equipment for Miniature Circuit Breakers

The MCB thermal testing equipment is designed to verify the time-delay tripping performance of circuit breakers under simulated overload and high-current conditions. Its workflow is as follows: The equipment outputs a standard rated current to simulate an overload and determines whether the circuit breaker thermally trips within a specified time. Based on the test results, the position of the bimetallic strip is fine-tuned by adjusting the screw. The system automatically outputs a pass/fail result.
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  • MCB Automated equipment

  • HAIPART

Key Processes

1

Pin Riveting (Initial Fixation)

Secure and stabilize the mechanical structure of the circuit breaker
2

Thermal Test (Overload Simulation)

Apply a simulated overload current to evaluate delayed tripping performance
3

Automatic Calibration

If deviations are detected, the system automatically adjusts screws to calibrate the bimetallic strip position
4

Cooling & Reset

Restore the circuit breaker to its initial state through an automated cooling system
5

Verification Test

Confirm tripping reliability after calibration
6

Multi-Pole Assembly (Optional)

Assemble qualified single-pole breakers into multi-pole units and perform secondary pin riveting
7

Magnetic Tripping Test

Simulate short-circuit conditions to test rapid protection performance
8

Withstand Voltage Test

Verify insulation strength under high voltage
9

Final Assembly & Laser Marking

Install stoppers and use laser marking to print parameters, models, and customer logos

Product Features

1

Full-Process Automatic Testing

covering thermal, magnetic, insulation, and mechanical functions
2

High-Precision Auto-Calibration

ensuring accurate bimetallic strip positioning
3

Multi-Pole Production Capability

with automated assembly and riveting
4

Enhanced Reliability & Consistency

through comprehensive performance verification
5

Laser Marking Integration

enabling customizable labeling and traceability
6

High Efficiency

achieved through streamlined automated workflows
















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