TH-T18 0.35A Thermal Relay

In automation instruments, precision drives, and small equipment, there are a large number of three-phase micro motors with a power of only a few hundred watts. The rated current of these motors is extremely small (usually below 1A), and the protection curve of general-purpose thermal relays within this range is often not precise enough to achieve effective protection. The SPX durable TH-T18 0.35A Thermal Relay is a professional solution designed for such small current applications. It achieves high sensitivity and stability protection at 0.35A current through the miniaturization and precision design of bimetallic sheet materials, heating elements, and action mechanisms, filling the gap in specialized protection for micro motors.

Features:

SPX factory's high quality TH-T18 0.35A Thermal Relay has undergone special thermal mechanical structural optimization to address the weak heat generated by small currents around 0.35A. This make sure that the bimetallic strip can produce sufficient and precise deformation, enabling the inverse time protection feature to reliably trigger even under small overloads (such as 1.1 times In), avoiding protection blind spots.

TH-T18 ensures extremely high consistency of protection characteristics between products through precision manufacturing processes, even at the micro scale where current fluctuations at the microampere level may affect protection points, making it suitable for mass application in standardized micro devices.Exquisite in size, it can be directly plugged into micro AC contactors (such as 9A~12A grade) to form an ultra compact micro motor starter, greatly saving valuable space in the control cabinet.

Advantage:

Customized TH-T18 0.35A Thermal Relay, as a pure electromechanical protection component, does not require external power supply and is completely insensitive to voltage fluctuations, harmonics, and electromagnetic interference in control systems. It can also operate stably in complex microsystems powered by frequency converters or switching power supplies.

Although the action mechanism is small, it is still equipped with clear manual reset buttons and trip indication signs, which facilitate status recognition and fault reset in densely installed micro control units.

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