stemco
Two Stage Bulb & Capillary Thermostats
The Type 352 series of Bulb and Capillary thermostat utilizes two separate switches for two stage or double pole switch action. The two switches can be any combination of SPDT Automatic Reset Switches, and/or 2 SPST Manual Reset Switches.
The switch can be used for a combination of heating and cooling, or fan and limit, from one thermostat; or use it for three phase or double line breaks.
QUALITY AMBIENT COMPENSATION
Our capillary thermostats also offer the option of being ambient compensated to offset the differential in temperature which keeps our thermostat controls more accurate as it’s environment changes.
CERTIFIED
Senasys takes pride in quality control and reliable operation of our products. Every switch is individually 100% tested before it leaves the plant. Our capillary thermostats are UL & cUL approved.
CUSTOM OPTIONS
Capillary thermostat switches built by Senasys can also be built to customer specifications. This ensures you get the exact control you want without paying for features you don’t need.
MADE IN U.S.A.
Products are designed, manufactured, tested and shipped from Senasys’ facilities in Eau Claire, WI to clients across the globe.
The Type 352 series of Bulb and Capillary thermostat utilizes two separate switches for two stage or double pole switch action. The two switches can be any combination of SPDT Automatic Reset Switches, and/or 2 SPST Manual Reset Switches.
The differential between the switches can be factory set very close for Double Pole applications or wider for Multistage applications. Wiring the two double throw switches in series allows the 352 to be used where a very large differential between on and off is required. The two switches can also be wired together to create a heating/cooling thermostat with dead band.
The combination of an automatic reset and a manual reset switch is ideal for applications where the automatic reset switch is the controlling switch and the manual reset switch is used as a safety or limit switch.
- 0°F – 700°F Temperature Range
- Adjustable or Fixed Temperature
- Automatic or Manual Reset
- 2 SPDT Switches
- 15 – 25 Amps per Switch
- Panel, Back or House Mounting Options
- Front Terminals
- 250°F Maximum Ambient Temperature
- Screw Driver or D Shaft Adjustment Options
- Copper, Nickel Plated Copper or Stainless Steel Bulb & Capillary Options
Cross Reference
We are certain of our position at the top so we’re comparing our Two Stage Capillary Thermostats with other top brands.
BRANDS
STEMCO
352 Series
SELCO
ROBERTSHAW
0°F to 700°F Temperature Range
250°F Max Ambient
Adjustable Temperature
Fixed Temperature
Auto Reset
Manual Reset
Two Stage
Screw Terminals
Rated up to 25 Amps @ 250VAC
Copper or Stainless Steel Material
Multiple Mounting Options
UL / cUL Recognized
Made in U.S.A.
Common Applications
Two Stage Bulb & Capillary Thermostats are commonly found in HVAC equipment to control & limit the heating element temperature.
HVAC
Dimensional Drawings
Our two stage bulb & capillary thermostats are available with a screw driver or D-Shaft adjustment knob, & can be panel, back or housed for mounting into your equipment. All dimensions shown below are inches/millimeters.
Screw Driver adjustable, shown with back mount, & two SPDT automatic reset switches.
Adjustable with D-Shaft shown with housing, & two SPDT automatic reset switches.
Screw driver adjustable shown with front panel mount, & two SPST manual reset switches.
Screw driver adjustable shown with back mount, & two SPDT automatic reset switches.
Mounting ear options illustrated.
Fitting Options
Our Two Stage Bulb & Capillary Thermostats are available with a variety of standard fittings & bulb supports.
See available fitting options below.
Standard Fittings
Thread
Material
Hex Size
‘L’ Length
Finish
Part #
1/8 NPT
Brass
7/16″
0.625″
None
368-67-03061
1/8 NPT
S-Steel
7/16″
0.625″
None
368-67-03023
1/4 NPT
Brass
5/8″
0.750″
None
368-67-03201
1/4 NPT
Brass
5/8″
0.750″
Nicked Plated
368-67-03202
1/4 NPT
S-Steel
5/8″
0.750″
None
368-67-03161
3/8 NPT
Brass
11/16″
0.750″
None
368-67-03001
3/8 NPT
Brass
11/16″
0.750″
Bright Nickel
368-67-03001P
3/8 NPT
S-Steel
11/16″
0.750″
None
368-67-03002
1/2 NPT
Brass
7/8″
0.875″
None
368-67-03101
1/2 NPT
Brass
7/8″
0.875″
Bright Nickel
368-67-03102
1/2 NPT
S-Steel
7/8″
0.875″
None
368-67-03103
Bulb Support Fittings
Our Two Stage Bulb & Capillary Thermostats are available with a variety of standard fittings & bulb supports.
See available bulb support fittings below.
Standard Bulb Support Fittings
Thread
Material
Hex Size
‘L’ Length
‘A’ Dia.
‘B’ Dia.
Finish
Part #
1/4 NPT
Brass
5/8″
1.620″
0.257″
0.390″
None
368-67-03241
1/4 NPT
S-Steel
5/8″
1.620″
0.147″
0.390″
None
368-67-03242
1/4 NPT
S-Steel
5/8″
1.620″
0.257″
0.390″
None
368-67-03243
1/2 NPT
S-Steel
7/8″
1.372″
0.257″
0.315″
None
368-67-03261
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