Applications :

Model PXB Switch Box For Transformer Protection is suitable for AC 50Hz distribution network with rated voltage 380V,rated current up to 800(750)A,used to protect against overload and short-circuit of the secondary side of outdoor distribution transformer,and to switchover electric circuits unfrequently.PXBL type is additionally designed with functions of protection against electric leakage and electric shock,and energy measurement. The enclosure of switch box is made of stainless steel plate,with artistic outward appearance,rust-proof,corrosion-proof,foreign body proof,and convenient operation; DZ127 series Moulded Case Circuit Breaker combined to switch box can work normally at ambient temperature of 70℃,to prevent cut-off event in large region which usualty occur by nuisance operation of common circuit breaker under high temperature caused by out door burning sun;in comparision with the same usage product,this unit is designed with small volume,large capacity,reliable operation and cheaper price.

符合标准号 :

IEC947—2 GBl4048．2 IEC755 GB6829

特点:

开关箱外壳用不锈钢板制成，外形美观，　防锈、耐腐蚀性能良好，并具有良好的防雨淋和防异物进入功能，,操作方便；配用的3KM1(DZ127)系列塑壳断路器能在70℃环境温度下正常运行，　可以避免户外烈日高温下，由于普通型断路器误动作而发生较大面积停电事故，与同类型产品比较，本产品体积小、容量大、运行可靠，价格便宜。

技术数据 Technical Data

序号 No.	电器元件型号、名称 Name and type of electrical components	主要技术数据 Main technical data
1	DZ127 断路器 DZ127 Moulded case circuit breaker	额定电压 Rated voltage：400V 额定电流 Rated current at ＋30°C：800，630，500，400，350，315，225，160，100A 额定电流 Rated current at ＋70°C：750，630，500，400，350，315，225，160，100A 额定极限短路分断能力 Rated ultimate shortcircuit breaking capacity：50kA
2	JD6-D型 漏电继电器 JD6-D Residual current relay	额定电压 Rated voltage：220V/380V 额定电流 Rated current：400～750A 额定漏电动作电流 Rated electric leakage operating current：0.3A or 0.5A 额定漏电动作电流 Rated electric shock operating current：0.05A or 0.075A 额定分断时间 Rated operating time：≤0.2s 延时重合闸时间 Delayed reclosing time：20～30s
3	DT862-4 三相四线有功电度表 DT862-4 3-phase 4-wire active kW.h meter	额定电压 Rated voltage：220V/380V 额定电流 Rated current：3（6）A 经电流互感器接入式 Connected through a current transformer

过电流保护特性
Over-current protective characteristics

周围空气温度 Ambient air temperature	试验电流 Test current	试验时间 Test time	预期结果 Result to be obtained	起始状态 Initial condition
+30±2°C或 or +70±3°C	1.05In	t≥2h	不脱扣 Non tripping	冷态 Cold
	1.30In	t<2h	脱扣 Tripping	热态 Hot
任何适合温度 Any convenient temperature	5In 或 10In	t≤0.2s	脱扣 Tripping	冷态 Cold

外形尺寸和安装尺寸: