描述
1.保护功能
过载保护（热保护）：
原理：通过双金属片受热弯曲触发脱扣，反时限特性（IEC 60255-3），电流越大，脱扣时间越短。
可调范围：通常为0.7~1.0In（如YT204001的过载保护范围为280A~400A），适应不同负载特性。
短路保护（磁保护）：
原理：电磁脱扣器在短路电流（如>5kA）作用下瞬时动作（<0.1s），快速切断电路。
短路分断能力：36kA（400V），满足大多数工业配电系统需求。
2.硬件规格
额定参数：
额定电流（In）：400A（固定值，不可调）。
额定电压（Ue）：690V（适用于400V/690V三相交流系统）。
极数：3P（三极），支持三相三线或三相四线制（需外接中性线）。
安装方式：
导轨安装（DIN rail）：兼容标准35mm导轨，便于快速更换与维护。
固定式安装：通过螺栓固定在配电柜内，适合长期稳定运行。
操作机构：
旋转手柄：支持手动合闸/分闸，手柄位置清晰指示断路器状态（ON/OFF/TRIP）。
储能机构：可选配手动储能或电动储能（需外接储能电机），实现快速合闸。
3.附件扩展
辅助触点（AX）：
1NO+1NC（常开+常闭），用于信号反馈（如运行/故障指示），支持与PLC或指示灯连接。
报警触点（AL）：
1NO+1NC，在断路器脱扣时触发，用于声光报警或通知维护人员。
分励脱扣器（ST）：
接收外部直流信号（如24V DC）强制分闸，适用于远程控制或消防联动。
欠压脱扣器（UV）：
监测电压低于设定值（如70%Ue）时自动分闸，防止设备在低电压下运行损坏。
1.Protection function
Overload protection(thermal protection):
Principle:Trip is triggered by heat bending of bimetallic sheet,reverse time limit characteristic(IEC 60255-3),the larger the current,the shorter the trip time.
Adjustable range:usually 0.7~1.0In(for example,the overload protection range of YT204001 is 280A~400A),which is suitable for different load characteristics.
Short circuit protection(magnetic protection):
Principle:The electromagnetic tripper operates instantaneously(<0.1s)under the action of a short circuit current(such as>5kA)to quickly cut off the circuit.
Short circuit breaking capacity:36kA(400V),meeting the needs of most industrial distribution systems.
2.Hardware specifications
Rated parameters:
Rated current(In):400A(fixed value,non-adjustable).
Rated voltage(Ue):690V(suitable for 400V/690V three-phase AC system).
Number of poles:3P(three poles),supports three-phase three-wire or three-phase four-wire system(need to be connected to neutral wire).
Installation method:
Rail mounting(DIN rail):Compatible with standard 35mm rails for quick replacement and maintenance.
Fixed installation:fixed in the distribution cabinet by bolts,suitable for long-term and stable operation.
Operating mechanism:
Rotating handle:supports manual closing/opening,and the handle position clearly indicates the circuit breaker status(ON/OFF/TRIP).
Energy storage mechanism:It can be equipped with manual energy storage or electric energy storage(need to external energy storage motor)to achieve rapid closing.
3.Attachment extension
Auxiliary contacts(AX):
1NO+1NC(normally open+normally closed),for signal feedback(such as operation/fault indication),supports connection with PLC or indicator.
Alarm contacts(AL):
1NO+1NC,triggered when the circuit breaker is tripped,is used to sound and light alarm or notify maintenance personnel.
Dividing tripper(ST):
Receive external DC signals(such as 24V DC)for forced opening,suitable for remote control or fire fighting linkage.
Undervoltage Trip(UV):
Automatically open the monitoring voltage when it is lower than the set value(such as 70%Ue)to prevent damage from operating at low voltage.
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