Jone Ye
Joyce Lin
Poekah Huang
STH-N12 Thermal Overload Type Relay 3 Phase
Product Description
SPX's high-quality STH-N series thermal relays are designed for applications with an AC power frequency of 50/60Hz, with a rated working voltage of up to 690V and a rated current of up to 630A. This thermal relay can provide effective overload protection and phase interruption protection for general AC motors in long-term or intermittent operation. It not only has the phase interruption protection function, ensuring that the circuit can be cut off in time when there is a problem with the power phase, thereby protecting the safe operation of the motor. In addition, the relay is also equipped with a temperature compensation mechanism that can automatically adjust its operating parameters according to changes in ambient temperature to ensure stability and reliability under different temperature conditions.
In order to facilitate users to monitor the status of the equipment, the SPX STH-N series thermal relay also has a trip indication function, which can clearly show whether the equipment is in normal working condition or has failed. When the equipment fails, users can choose automatic or manual reset to restore the normal operation of the equipment, which increases the flexibility and convenience of operation. In addition, the relay can be used in conjunction with the contactor to form a more complete protection system, or it can 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. Through these designs, the SPX STH-N series thermal relay provides users with a reliable and efficient solution to meet the needs of modern industry for motor protection.
The STH-N12 thermal relay is suitable for S-C10/12 AC Contactor
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Frame(A) |
STH-N18(TH-N18) |
STH-N25(TH-N25) |
STH-N50(TH-N50) |
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Suitabie AC contactor |
S-C10/12 |
S-C21/25 |
S-C50/95 |
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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 |
15A |
12~18 |
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0.35A |
0.28~0.42 |
1.7A |
1.4~2.0 |
19A |
16~22 |
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0.5A |
0.4~0.6 |
2.1A |
1.7~2.5 |
22A |
18~26 |
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0.7A |
0.55~0.85 |
2.5A |
2~3 |
29A |
24~34 |
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0.9A |
0.7~1.1 |
3.6A |
2.8~4.4 |
35A |
30~40 |
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1.3A |
1~1.6 |
5A |
4~6 |
42A |
34~50 |
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1.7A |
1.4~2.0 |
6.6A |
5.2~8 |
54A |
43~65 |
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2.1A |
1.7~2.5 |
9A |
7~11 |
67A |
54~80 |
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2.5A |
2~3 |
11A |
9~13 |
82A |
65~93 |
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3.6A |
2.8~4.4 |
15A |
12~18 |
95A |
85~105 |
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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-N20 |
63 |
51 |
79 |
4.5 |
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TH-N60 |
89 |
57 |
83.5 |
4.5 |
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SPX Thermal Relays Feature And Application
Raw materials with minimal environmental impact
Materials resistant to flames and heat
Extended lifespan of machinery
3C certification (maintaining the original meaning)