Enclosure heaters without fan
Specifications
The automation cabinet heater has a robust design, consisting of a heating element, an aluminum radiator, a heat-resistant wire and a thermal relay. We offer enclosure heaters in standard sizes and power from 50 to 250 watts. A heating specialist will help you choose the right power of the heating device, who will advise on technical issues, installation and connection.
Rated voltage, V: 12; 24; 110; 220
Starting current, amps: 2
Maximum surface temperature, °C: 105
Degree of protection: IP20
Permissible operating temperature, °C: -40..+70
Permissible storage and transport temperature, °C: -40..+70
Mount type, mm: DIN rail 35
Connection type, mm²: terminal connection 3 x (0.5..2.5)
Description
The enclosure heaters case consists of an aluminum radiator. Body parts are powder coated. A resistive heater and a thermal relay are built into the radiator, which limits the surface temperature. As standard, heat-resistant terminals are installed in the heaters of control cabinets for connecting the power supply. Available on request with cable connection.
Model variants Enclosure heaters(EH)
| Model | Power, W | Dimensions radiator, mm | Dimensions WxHxD, mm | Weight, kg |
| EH 70*92;0.05*220;1 | 50 | 70х90х28 | 96х92х47 | 0,3 |
| EH 90*92;0.075*220;1 | 75 | 90х92х28 | 116х92х47 | 0,4 |
| EH 144*92;0.1*220;1 | 100 | 144х92х28 | 170х92х47 | 0,5 |
| EH 135*122;0.12*220;1 | 120 | 135х122х40 | 161х122х59 | 0,8 |
| EH 165*122;0.15*220;1 | 150 | 165х122х40 | 191х122х59 | 0,9 |
| EH 203*122;0.18*220;1 | 180 | 203х122х40 | 229х122х59 | 1,1 |
| EH 270*122;0.25*220;1 | 250 | 270х122х40 | 296х122х59 | 1,4 |
Connection types
Drawing
How to choose
Pp – the power of heat losses to the environment is determined by the formula:
Pp = S*ΔT*α, Wt
where
S – cabinet surface area, m2;
ΔT is the difference between the temperature inside the cabinet and the ambient temperature, K.
α is the heat transfer coefficient, W/(m2*K).
The heat transfer coefficient α at the boundary of the media “Air – smooth surface” is determined by the formula:
∝ =5.6+6v, W/(m2*K)
where v is the speed of air movement in the cabinet installation area, m/s.
Heater selection example.
Initial data: A cabinet of a standard form with dimensions of 2200x600x400 mm. is installed in a closed unheated room. The minimum possible indoor temperature is -5°C. The minimum allowable operating temperature of the equipment installed inside the cabinet is +5°С.
Surface area:
S=2(2.2*0.6+0.4*0.6+2.2*0.4)=4.88m2
Temperature difference:
∆T=5-(-5)=10K
Heat transfer coefficient:
∝ =5.6+6*0=5.6 W/(m2*K)
Heat loss power to the environment:
Pp=4.88*10*5.6 = 273.28 W
Taking into account the fact that downtime is possible for the equipment inside the cabinet, we accept
∑Pob =0
In this way:
∑Pload>273.28 W
In this case, it is necessary to install two heaters: one with a power of 180W and one with a power of 120W.