热继电器主要用于交流频率50Hz和60Hz，额定电压至690V，额定电流至800A的电力系统中，作为三相交流电动机的过载保护和断相保护。延迟型（带饱和电抗器）特别适用于起动时间长的电动机负载。热过载继电器与上级保护的塑壳断路器可以轻松实现协调保护。
热继电器TH-N系列型号规格
TH-N12
TH-N12KP
TH-N12CX
TH-N12SR
TH-N18
TH-N18CX
TH-N20
TH-N20CX
TH-N20SR
TH-N20TA
TH-N20TA SR
TH-N20KP
TH-N20KP SR
TH-N20TAKP
TH-N20TAKP SR
TH-N20TAKP CX
TH-N60KP
TH-N60KP SR
TH-N60TAKP
TH-N60TAKP SR
TH-N120KP
TH-N120KP SR
TH-N120TAKP
TH-N120TAKP SR
TH-N220RHKP
TH-N220RHKP SR
TH-N220HZKP
TH-N220HZKP SR
TH-N400PHKP
TH-N400RHKP SR
TH-N400HZKP
TH-N400HZKP SR
TH-N600KP
TH-N600KP SR
