Fenwal Thermoswitch^® Temperature Controllers

• Adjustable setpoint 
• Rugged construction 
• Various head styles 
• UL component recognition 
• Strut-and-tube type thermostats comprised of two basic parts: (1) the outer shell - made of high expanding metal and (2) the strut assembly - made of low expanding metal 
• A pair of electrical contacts is mounted on the strut assembly and installed in the shell under tension or compression. Because each end of the strut assembly is mechanically connected to the ends of the shell, a net change in force is produced on the low-expansion strut assembly as the high expanding shell expands or contracts with changing temperature. The temperature at which the contacts make or break can be regulated by a temperature adjusting sleeve 
• Options: Coupling head well; High pressure coupling head well 

Series 17000 Cartridge --

• May be inserted in a 5/8" reamed hole. If reamed hole is used, a short spline should be added to receive locating pin on thermostat-this prevents thermostat from turning when the temperature adjusting sleeve is turned 

Series 17100 Hex Head --

• Has all the internal features of the Cartridge Type above with the addition of a standard pipe thread for mounting purposes. A dial, knob and armored cable over lead wires can be supplied with this model 

Series 17200 Block Head --

• Has the same mounting characteristics as the Cartridge Type unit but is designed so additional components such as a dial, knob, armored cable over lead wires, packing glands over lead wires, and tamper-proof cap over temperature adjusting sleeve may be included 

Series 17300 Flange Head --

• Has all the features of the Block Head Type except a mounting flange has been provided for easy mounting 

Series 17800 Junction --
Box Immersion

• Has electric conduit box containing terminal block, temperature adjusting dial and knob. Extended hexagonal section with standard pipe thread permits easy mounting into properly tapped hole or boss, immersing shell into fluid medium to be controlled 
• (Dial and knob can be provided outside of box) 

30000 Series Surface Mounting Thermoswitch Controller

Adjusting screw  Expanding stainless steel case  Fine silver contacts  Low expansion metal bridge  The outer shell or case is the activating element. A temperature change is sensed immediately by the case, expanding or contracting in response. This linear change activates an internal bridge, opening the electrical contacts with increase in temperature