Sdkc High Breaking Height 630A Molded Case Circuit Breaker

3P molded case circuit breakers are mainly used in three-phase three-wire circuits and can control three live wires (L1, L2, L3) at the same time, suitable for balanced loads such as three-phase motors and three-phase heating equipment. 4P, on the basis of 3P, adds a neutral wire, which is suitable for three-phase four-wire circuits and can cut off the three-phase power supply and neutral wire at the same time. It is often used in power distribution systems with neutral wires or scenarios where

When wiring 3P molded case circuit breakers, attention should be paid to: 1. Phase sequence connection: Strictly connect the three-phase live wires according to the marks (L1, L2, L3) to ensure the correct phase sequence, otherwise it may cause the three-phase motor to reverse. 2. Wiring method: Copper wires or copper bars can be used for connection. The cross-sectional area of the wires must match the rated current to ensure good contact and avoid heating caused by excessive contact resistance.

Common reasons are: 1. Tripping mechanism failure: Parts such as the tripping spring and lock of one pole are worn or stuck, resulting in delayed or no action. It is necessary to check and replace the damaged parts. 2. Poor contact of contacts: Oxidation, ablation or loose wiring of contacts in a certain phase causes abnormal current in that phase, leading to inconsistent protection actions. It is necessary to clean the contacts, tighten the wiring or replace the contacts.

Electrical performance testing, mechanical performance testing, appearance inspection, temperature rise test, etc.

We use carton packaging, cardboard box packaging, and wooden box packaging (all comply with international export standards).