1. The tripping characteristics are different. The instantaneous tripping range of C characteristic is (5 ~ 1) In, which is used to protect conventional loads and distribution cables, and the instantaneous tripping range of D characteristic is (1 ~ 14) In. Used to protect the impact load (such as motor, transformer, etc.) with large starting current.
2. The rated current is different. C characteristic: 5~1 times rated current, D characteristic: 1~2 times rated current.
3, the use of different occasions. C characteristic is the most commonly used, generally used for building lighting electricity and so on; D characteristics are generally used for power distribution.
Extended data:?
The main function of the idle switch
Under normal circumstances, the armature of the overcurrent release is released; In the event of serious overload or short circuit fault, the coil connected in series with the main circuit will generate strong electromagnetic attraction to attract the armature downward and push the unlocking hook to disconnect the main contact. The undervoltage release works just the opposite. When the voltage is normal, the electromagnetic attraction attracts the armature and the main contact is closed.
once the voltage drops seriously or the power is cut off, the armature is released and the main contact is disconnected. When the power supply voltage returns to normal, it must be switched on again before it can work, thus realizing voltage loss protection.