Jone Ye
Joyce Lin
Poekah Huang
STH-T25 3 Phase Thermal Overload Relay Protection
Product Description
SPX STH-T series thermal overload relays are designed for applications with AC frequency of 50Hz or 60Hz, with rated working voltage up to 690V and rated current capacity up to 630A. This advanced relay can provide effective overload protection and phase failure protection for general AC motors, whether it is long-term continuous operation or intermittent use.
One of the relay’s standout features is its phase interruption protection function, which ensures that the circuit is immediately cut off if there is any problem with the power phase. This critical function plays a vital role in guaranteeing safe operation of the motor and preventing potential damage or failure. In addition, the relay is equipped with an advanced temperature compensation function, which enables it to automatically adjust its operating parameters according to fluctuations in ambient temperature. This feature ensures stability and reliability even under varying temperature conditions.
To enhance user experience and facilitate monitoring of equipment status, the SPX STH-T series thermal overload relays also integrate a trip indication function. This function can clearly show whether the equipment is operating normally or has a fault. If a fault occurs, the user can choose automatic or manual reset to quickly restore normal operation. This flexibility greatly improves the convenience and ease of user operation.
Relays can be seamlessly integrated with contactors to create a more comprehensive protection system, or they can be installed independently to meet different installation requirements and application scenarios. This versatility ensures safe and efficient operation of motors under various working conditions, making the SPX STH-T series an excellent choice for a variety of industrial applications.
The STH-T25 thermal relay is suitable for S-M20/25 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 Thermal Overload Relay Feature And Application
Flame retardant materials and heat resistance are fundamental features of our products, ensuring they can withstand high temperatures and flame resistance, thereby increasing safety and reliability in a variety of applications. In addition, our products are designed to extend machine life, meaning they are able to withstand long periods of rigorous use without compromising performance. In addition, we are proud to have received the 3C certification, which demonstrates our commitment to meeting Chinese national quality and safety standards. This certification not only reflects our commitment to producing high-quality products, but also assures our customers of the reliability and durability of our products.