Is horizontal (lateral) installation of the circuit breaker permitted?

However, when there are no specific regulations for Circuit Breakers, they should be installed vertically, with the tilt angle not exceeding 5°. The general rule is to connect the power supply line at the upper end and the outgoing line at the lower end, while the upward-facing handle indicates the closed position.

If an alternative approach is necessary under special circumstances and horizontal (lateral) installation is required, the general practice is to have the left side as the incoming line and the right side as the outgoing line, with the left side being the closing position. Although no specific regulations have been issued, it is not permitted to install the circuit breaker upside down. Lateral installation of the circuit breaker often feels less effective because the human hand, designed for reciprocating motion, has greater force when moving forward and backward, while lateral movement is merely a swinging motion.

As a circuit breaker for circuit protection, whether installed horizontally or vertically, it is important to know how to maintain the circuit breaker

① When disconnecting the circuit breaker, the handle must be pulled towards the "OFF" position, and when closing, the handle must be pushed towards the "ON" position. To reclose an automatic trip circuit breaker, first pull the handle towards the open position (OFF) to reset the circuit breaker trip, and then push the handle towards the close position (ON) before the circuit breaker can be closed.

② The adjustment screw used to adjust the distance between the traction rod and the bimetallic strip of the electromagnetic release installed in the circuit breaker shall not be adjusted arbitrarily to avoid affecting the action of the release and causing accidents.

③ When the setting current of the electromagnetic release of the circuit breaker does not match the current of the equipment in the place of use, the equipment should be inspected and readjusted before the circuit breaker can be put into use.