Jone Ye
Joyce Lin
Poekah Huang
STH-T18 Adjustable Thermal Overload Relay 3 Phase
Product Description
SPX's advanced STH-T series adjustable thermal relay is designed for general overload protection and phase-break protection of AC motors, and can provide reliable protection in long-term or intermittent operation. The rated working voltage of this relay is up to 690V, and the current capacity can reach 630A, which is suitable for AC 50/60Hz systems. This thermal relay not only has the function of phase-break protection, which can cut off the circuit in time when there is a problem with the power phase, thereby effectively protecting the safe operation of the motor, but also has a temperature compensation function, which can automatically adjust its working parameters according to changes in ambient temperature to ensure stability and reliability under different temperature conditions.
The SPX STH-T series thermal relay also has a trip indication function, which can clearly display the working status of the equipment and help users to know whether the equipment is operating normally in time. When the equipment fails, users can choose automatic or manual reset to restore the normal working state of the equipment, which increases the flexibility and convenience of operation. The design of this relay takes into account the convenient integration with the contactor. Users can easily use it with the contactor to form a more complete protection system. At the same time, it can also be installed independently to adapt to different installation requirements and application scenarios, ensuring the safe and efficient operation of the motor under various working conditions.
The STH-T18 thermal relay is suitable for S-M10/20 AC Contactor
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Frame(A) |
STH-T18(TH-T18) |
STH-T25(TH-T25) |
STH-T50(TH-T50) |
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Suitabie AC contactor |
S-M10/12 |
S-M20/25 |
S-M35/50 |
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Aux contact structure |
Manual or Auto retum |
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Adjust range selcet(A) |
Select(A) |
Adjust range(A) |
Select(A) |
Adjust range(A) |
Select(A) |
Adjust range(A) |
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0.24A |
0.2~0.32 |
1.3A |
1~1.6 |
29 |
24~34 |
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0.35A |
0.28~0.42 |
1.7A |
1.4~2.0 |
35 |
30~40 |
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0.5A |
0.4~0.6 |
2.1A |
1.7~2.5 |
42 |
34~50 |
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0.7A |
0.55~0.85 |
2.5A |
2~3 |
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0.9A |
0.7~1.1 |
3.6A |
2.8~4.4 |
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1.3A |
1~1.6 |
5A |
4~6 |
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1.7A |
1.4~2.0 |
6.6A |
5.2~8 |
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2.1A |
1.7~2.5 |
9A |
7~11 |
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2.5A |
2~3 |
11A |
9~13 |
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3.6A |
2.8~4.4 |
15A |
12~18 |
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5A |
4~6 |
19A |
16~22 |
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6.6A |
5.2~8 |
22A |
18~26 |
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9A |
7~11 |
29A |
24~34 |
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11A |
9~13 |
35A |
30~40 |
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Aux contact structure |
1a1b(1NO+1NC) |
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Outline and installation dimension |
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Type |
L |
W |
H |
φD |
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TH-T25 |
63 |
51 |
81 |
4.5 |
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SPX Adjustable Thermal Relays Feature And Application
Environmentally raw material
Flame retardant material, heat-resisting
Long machine life
3C certificate