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In systems with dual power supply or two incoming lines and one busbar, forcing two/three MCCBs to "one in one out" prevents phase-to-phase short circuit, circulating current, and equipment damage caused by two power supplies being mistakenly parallel is the essential safety guarantee for dual power supply switching.
By using mechanisms such as levers, connecting rods, or steel cables, a hard constraint of "opening first and then closing" is achieved. When the closing side is locked, the other side cannot be operated without relying on electrical signals, and the control system remains effective even when it fails.
Supports opening/closing locking. During maintenance, lock the opening to prevent accidental closing, or lock the closing to avoid unauthorized opening. Combined with a padlock, it can meet the safety regulations of "locking and hanging".
The position of the operating handle is forcibly matched with the state of the main contact, reducing the risk of electric shock or misoperation caused by misjudgment of the state.
Independent of electrical circuits, resistant to electromagnetic interference, stable operation even in the event of power loss, suitable for scenarios such as hospitals, data centers, and rail transit that require high power continuity.
| Scene | Mechanical interlocking implementation methods | Core Objectives |
|---|---|---|
| Dual power supply (ATS) | The two MCCBs are interlocked, with only one circuit closed. | Protect against parallel short circuits in power supplies and ensure safe switching. |
| Two incoming lines and one bus tie | Three locks and two keys / hard interlock, any two units can be combined. | Busbars are operated in sections to prevent short circuits between sections. |
| Extractable MCCB | Handcart and circuit breaker operation interlock | Isolate the power supply during maintenance to prevent hot-plugging. |
| Load side maintenance | Circuit breaker locking + padlock | Prevent accidental closing and ensure personnel safety. |
| Characteristic | Mechanical interlock | Electrical interlocking |
|---|---|---|
| Reliability | Extremely high performance, purely mechanical, still effective even in the event of power failure or malfunction. | It relies on a secondary circuit and may fail in the event of a fault. |
| Response method | Forced mechanical constraints, no intermediate state | There may be a switching delay due to the reliance on control signals. |
| Applicable Scenarios | Dual power supply, bus tie, lockable and tag-mounted | Automatic switching, remote control, and complex logic linkage |
| Compliance | Power supply departments give priority to approval, and compliance with mandatory standards is required. | It often needs to be used in conjunction with mechanical interlocks. |
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It physically prevents two power sources from being connected in parallel, which avoids catastrophic phase-to-phase short circuits and circulating currents, ensuring a safe transfer of power.
Mechanical interlocking relies on physical constraints (like levers or cables) rather than electrical signals. This makes it 100% reliable even during complete power loss or control system failures.
It ensures that only a maximum of two circuit breakers can be closed at any given time among the two incoming lines and the bus tie, preventing unsafe parallel configurations.
Yes, it supports opening and closing locks which can be combined with padlocks to meet standard safety regulations during maintenance operations.
They are highly recommended for critical power scenarios requiring high continuity and safety, such as hospitals, data centers, rail transit, and industrial power distribution systems.
