Adjustable Thermal Relay

Established in 2005, Zhejiang SPX Electric Appliance Co., Ltd. proudly presents the STH-T series Adjustable Thermal Relay, meticulously crafted for optimal performance. Tailored for AC 50/60Hz systems, this relay is engineered to safeguard general AC motors from overload and phase break issues during long-term or intermittent operations. With a rated operating voltage up to 690V and a current capacity of 630A, it offers versatile protection.

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Product Description

The SPX advanced STH-T series Adjustable Thermal Relay is designed for the general overload and phase break protection of AC motors, capable of long-term or intermittent operation, with a rated operating voltage of up to 690V and a current capacity of 630A. It is suitable for AC 50/60Hz systems and incorporates features such as phase break protection, temperature compensation, trip indication, and both automatic and manual reset functionalities. Additionally, it can be conveniently integrated with contactors or installed independently.

The STH-T18 thermal relay is suitable for S-M10/20 AC Contactor.

Frame(A)	STH-T18(TH-T18)		STH-T25(TH-T25)				STH-T50(TH-T50)
Suitabie AC contactor	S-M10/12		S-M20/25				S-M35/50
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		29	24~34
	0.35A	0.28~0.42	1.7A		1.4~2.0		35	30~40
	0.5A	0.4~0.6	2.1A		1.7~2.5		42	34~50
	0.7A	0.55~0.85	2.5A		2~3
	0.9A	0.7~1.1	3.6A		2.8~4.4
	1.3A	1~1.6	5A		4~6
	1.7A	1.4~2.0	6.6A		5.2~8
	2.1A	1.7~2.5	9A		7~11
	2.5A	2~3	11A		9~13
	3.6A	2.8~4.4	15A		12~18
	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-T25		63	51	81	4.5