Thermal Relay With Overload Protection

Founded in 2005, Zhejiang SPX Electric Appliance Co., Ltd. introduces the STH-N series Thermal Relay With Overload Protection, meticulously engineered for exceptional performance. This relay is designed for AC 50/60Hz systems, providing reliable protection for general AC motors during long-term or intermittent operations. With a rated operating voltage of up to 690V and a current capacity of 630A, it ensures versatile and robust functionality.

Send Inquiry

Product Description

Founded in 2005, Zhejiang SPX Electric Appliance Co., Ltd. is delighted to present the STH-N series Thermal Relay With Overload Protection, a premium solution tailored for the safeguarding of general AC motors. Specifically designed for AC 50/60Hz systems, this relay is engineered for long-term or intermittent operations with a rated operating voltage of up to 690V and a current capacity of 630A.

This versatile relay offers comprehensive protection, including features such as phase break protection, temperature compensation, and a trip indication function. With convenient automatic and manual reset options, it adapts seamlessly to varying operational needs. The relay can be effortlessly integrated with contactors to enhance its functionality, or it can be installed independently, providing flexibility in application.

As a distinguished supplier based in China, SPX Electric Appliance Co., Ltd. is committed to delivering high-quality solutions. The STH-N series exemplifies our dedication to providing reliable products in the global market. Join us as we aspire to be your trusted, long-term partner in ensuring the efficiency and protection of your AC motor systems.

The STH-N20 thermal relay is suitable for S-C21/25AC Contactor.

Frame(A)	STH-N18(TH-N18)		STH-N25(TH-N25)		STH-N50(TH-N50)
Suitabie AC contactor	S-C10/12		S-C21/25		S-C50/95
Aux contact structure	Manual or Auto retum
Adjust range selcet(A)	Select(A)	Adjust range(A)	Select(A)	Adjust range(A)	Select(A)	Adjust range(A)
	0.24A	0.2~0.32	1.3A	1~1.6	15A	12~18
	0.35A	0.28~0.42	1.7A	1.4~2.0	19A	16~22
	0.5A	0.4~0.6	2.1A	1.7~2.5	22A	18~26
	0.7A	0.55~0.85	2.5A	2~3	29A	24~34
	0.9A	0.7~1.1	3.6A	2.8~4.4	35A	30~40
	1.3A	1~1.6	5A	4~6	42A	34~50
	1.7A	1.4~2.0	6.6A	5.2~8	54A	43~65
	2.1A	1.7~2.5	9A	7~11	67A	54~80
	2.5A	2~3	11A	9~13	82A	65~93
	3.6A	2.8~4.4	15A	12~18	95A	85~105
	5A	4~6	19A	16~22
	6.6A	5.2~8	22A	18~26
	9A	7~11	29A	24~34
	11A	9~13	35A	30~40
Aux contact structure	1a1b(1NO+1NC)
Outline and installation dimension



	Type		L	W	H	φD
	TH-N20		63	51	79	4.5
	TH-N60		89	57	83.5	4.5