Gray Bakelite Shell Thermal Overload Relay STH-40 Auxiliary Contact
Block
STH series of thermal overload relay can be used in the circuit of
50/60 HZ, rated insulation voltage 660 V, rated current 0.1-93A for protecting the phase break when the electric motor is
overload , the relay has different mechanism and temperature
compensation can be pluged in ST1 series AC contactor,It is the
most advanced thermal relay in the nineties in the world the
products comply with IEC 60947-4.
The thermal relay works on the principle of the thermal effect of
electrical energy. The bimetallic strips, heating coils and the
current transformers are the important parts of the thermal relay.
Specifications:
IEC STANDARD: 60947.1
COIL VOLTAGE:24,220,240,380,415V
RATED CURRENT:0.63,1,1.6,2.5,4,6,8,10,13,18,25,32(TR2-D13)
32,40A(TR2-D23)
32,40,50,65,70,80A(TR2-D33)
93,104,120,140A(TR2-D43)
Product Parameter
| Type | Thermal Component |
Rated Current
(A) | Regular or Scale of
Rated Current(A) |
| STH(GTH)-22 | 0.14 | 0.10-0.16 |
| 0.21 | 0.16-0.25 |
| 0.33 | 0.25-0.40 |
| 0.52 | 0.40-0.63 |
| 0.82 | 0.63-1.0 |
| 1.3 | 1.0-1.6 |
| 2.1 | 1.6-2.5 |
| 3.3 | 2.5-4.0 |
| 5 | 4.0-6.0 |
| 6.5 | 5.0-8.0 |
| 7.5 | 6.0-9.0 |
| 8.5 | 7.0-10.0 |
| 11 | 9.0-13.0 |
| 15 | 12.0-18.0 |
| 19 | 16.0-22.0 |
| STH(GTH)-40 | 22 | 18.0-26.0 |
| 30 | 24.0-36.0 |
| 34 | 28.0-40.0 |
| STH(GTH)-85 | 30 | 24.0-36.0 |
| 34 | 28.0-40.0 |
| 42 | 34.0-50.0 |
| 55 | 45.0-65.0 |
| 65 | 54.0-75.0 |
| 74 | 63.0-85.0 |
