RFQ For EV Fuses
May 13, 2022
RFQ For EV Fuses
Q1:What parameters do you need to know when selecting EV fuses?
A1:
●System rated voltage
●With or without forced air cooling
●Time constant (L/R)
●The ambient temperature where the fuse is located
●Maximum sustainable current
●Duty cycle period and waveform
●Maximum current duration
●Maximum short-circuit current value
●Peak current
●Minimum short-circuit current value
●Peak current duration
●Fuse installation position
●The current through the fuse for normal operation
●Cross-sectional area of connecting fuse wire
●The maximum sustainable voltage of the system
●With or without protection device coordination and voltage requirements
Q2:Are fuses from different manufacturers interchangeable? What parameters need to be known?
A2:Replacement of fuses must first have the following points before they can be interchanged.
1) Fuse of the same protection type (aR, gG, aM, etc.);
2) Dimensions can be interchanged;
3) Rated voltage, the same maximum breaking capacity;
4) Time and current characteristics can meet customer requirements;
5) The minimum breaking current of fuses in EV applications can meet customer requirements.
Q3:What are the current fuse failures encountered in EV applications?
A3:There are roughly the following categories
1) The fuse is broken during normal operation, and the life of the fuse is insufficient;
2) The fuse can not be broken in time when the fault current occurs, the breaking characteristics of the fuse fail to meet the requirements, or the fuse is improperly selected;
3) The fuse terminal bolts are not tightened, resulting in excessive heat generation, resulting in damage to the tube body, terminals or peripheral devices of the fuse, and the circuit.
Q4:What is the protection object of EV protection main circuit fuse?
A4:In EV applications, the main circuit fuse protects part of the power battery itself, and the other part is that after the main circuit is short-circuited, the circuit can be cut off in time to avoid excessive heat generation in the circuit, thereby protecting the safety of the circuit itself, related devices and the entire vehicle.
