Explanation:
- In this question, we are given a list of electrical components and we need to identify the one that does not have any repairable component.
- Let's analyze each option one by one to determine which one fits the criteria.

Air Blast CB (Circuit Breaker):
- An air blast circuit breaker is a type of circuit breaker that uses compressed air to extinguish the arc created during the interruption of electrical current.
- It consists of various mechanical and electrical components such as contacts, arc chutes, operating mechanisms, and control circuits.
- All these components can be repaired or replaced if they malfunction or get damaged.
- Therefore, the air blast circuit breaker does have repairable components.

MCB (Miniature Circuit Breaker):
- A miniature circuit breaker is a type of circuit breaker that is commonly used in residential and commercial electrical installations for protection against overcurrents and short circuits.
- It consists of mechanical and electrical components such as contacts, trip mechanisms, bimetallic strips, and arc extinguishers.
- Most of these components can be repaired or replaced if they fail or get damaged.
- Therefore, the miniature circuit breaker does have repairable components.

OCB (Oil Circuit Breaker):
- An oil circuit breaker is a type of circuit breaker that uses oil as an arc extinguishing medium.
- It consists of various mechanical and electrical components such as contacts, arc extinguishing chambers, oil tanks, operating mechanisms, and control circuits.
- All these components can be repaired or replaced if they malfunction or get damaged.
- Therefore, the oil circuit breaker does have repairable components.

Air Break:
- An air break is not a specific electrical component but rather a general term used to describe a type of switch or circuit breaker that uses air as the arc extinguishing medium.
- It may refer to air break switches or air break circuit breakers.
- These devices typically consist of mechanical and electrical components such as contacts, arc extinguishing structures, operating mechanisms, and control circuits.
- All these components can be repaired or replaced if they malfunction or get damaged.
- Therefore, the air break does have repairable components.

Conclusion:
- Based on the analysis, the correct answer is option 'B' - MCB (Miniature Circuit Breaker).
- A miniature circuit breaker does not have any repairable component as it is a compact unit and most of its components are not easily repairable or replaceable.
- In case of any malfunction or damage, it is more cost-effective to replace the entire MCB rather than repairing individual components.
- Therefore, the MCB does not have any repairable component.