A circuit breaker lock is a type of safety lock used on partition walls. Since it involves safety protection, the quality of its material is especially important. Let’s take a look at what materials circuit breaker locks are made of.
The raw material used in most circuit breaker locks is plastic. Many customers feel uneasy when they hear that the lock is made of plastic, as they associate plastic with being fragile or easily affected by environmental conditions. However, this product will change that perception. The high-quality engineering plastic used here is far superior to ordinary metal in many aspects.
This plastic is not just refined but also specially processed to achieve high durability and strength — properties comparable to or even exceeding those of metal products. Unlike metal locks, which are prone to rust and corrosion over time, the plastic material provides long service life and excellent resistance to environmental factors such as moisture and oxidation.
Since the circuit breaker lock is made of plastic, it is almost completely waterproof, and its performance under normal environmental conditions remains stable and reliable.
Working Principle
The working principle of the circuit breaker lock is to prevent malfunction or accidental operation during equipment inspection or maintenance. The locking mechanism grips the breaker handle, preventing it from being moved, thereby keeping the circuit breaker in a fixed (ON or OFF) position.
Structural Description
A typical circuit breaker locking device generally includes:
- Base (1)
- First clamp (5) and second clamp (6) — mounted on the base and hinged to a cover plate (2) via a pivot shaft (11) to hold the breaker handle in place.
After the first and second clamps secure the breaker handle, the cover plate (2) is flipped over the base (1), enclosing both clamps. The lock holes (3 and 4) on the base and cover align, allowing a padlock to pass through. Once locked, the cover cannot be rotated, effectively immobilizing the breaker handle.
Since the cover encloses the entire structure tightly against the breaker surface, the handle cannot be turned. Only when the padlock is unlocked and removed can the clamps be released, restoring the breaker to normal operation.
To adjust the positions of the first and second clamps (so that they can move closer together or farther apart), a driving mechanism is provided.
- The base (1) and clamps are equipped with guiding components for precise movement.
- The first clamp (5) slides along guide holes (9) via guide blocks (10), and the second clamp (6) moves along second guide holes (7) via guide blocks (8).
The driving mechanism for the first clamp (5) may include an eccentric cam (12) mounted around the pivot shaft. The cam interacts with the clamp surface—when rotated, it pushes the first clamp to slide along the guide holes.
For the second clamp (6), an adjusting screw mounted on the base connects to the clamp. The screw extends out through the base and is controlled by a handwheel (13). When the handwheel rotates, the screw moves, driving the second clamp to slide accordingly along its guide path.