Datasheet

Commercial Thermostats
4 www.honeywell.com/sensing
Figure 2. 2450R/2450HR/2455R/2452R/2452HR Series Phenolic Automatic Reset Thermostat
The 2450R/2450HR/2455R/2452R/2452HR Series is a
single pole, single throw, snap-acting, non-adjustable
thermostat which may be used in applications such as
power supplies, general appliances and medical equipment.
A temperature-sensitive bimetal disc, electrically and
thermally isolated from the switch, is used to actuate the
normally-closed contacts. Contacts open when surface or
ambient temperatures increase to the operating set point of
the calibrated bimetal disc. The entire switch is enclosed in
a phenolic housing; the bimetal disc is retained by a metal
heat-conducting end cap. Due to the small size of this unit
and the inherently low mass of the bimetal snap-action disc,
response of this thermostat to temperature changes is
extremely rapid, compared to other commercially available
thermostatic devices. A variety of mounting brackets and
terminals are available.
All versions are UL/CSA approved.
The 2452R/2452HR/2455R version meets the requirements of
EN60730-01.
Potential applications include:
• Power supplies
• Appliances
• Medical equipment
• Water heaters
• Office automation
• Industrial equipment
• HVAC equipment
Table 1. 2450R/2450HR/2455R/2452R/2452HR Series Standard Temperature Characteristics
Tolerance Operating Temperature Range
Open
°C [°F]
Close
°C [°F]
Standard Mean Differential
°C [°F]
±4 [±7] ±6 [±10] 28 to 34 [50 to 60]
±4 [±6] ±6 [±10] 22 to 27 [40 to 49]
±4 [±6] ±5 [±9] 17 to 22 [30 to 39]
±4 [±6] ±5 [±8] 14 to 16 [25 to 29]
0 °C to 26 °C
[32 °F to 79 °F]
±3 [±5] ±5 [±8] 8 to 14 [15 to 24]
±5 [±9] ±8 [±15] 45 to 56 [81 to 100]
±4 [±7] ±6 [±11] 34 to 45 [61 to 80]
±4 [±6] ±6 [±10] 28 to 34 [50 to 60]
±3 [±5] ±6 [±10] 22 to 27 [40 to 49]
±3 [±5] ±5 [±9] 17 to 22 [30 to 39]
27 °C to 82 °C
[80 °F to 180 °F]
±3 [±5] ±5 [±8] 8 to 16 [15 to 29]
±6 [±10] ±8 [±15] 45 to 56 [81 to 100]
±5 [±8] ±8 [±15] 34 to 45 [61 to 80]
±4 [±7] ±7 [±12] 28 to 34 [50 to 60]
±4 [±6] ±6 [±10] 22 to 27 [40 to 49]
±4 [±6] ±5 [±9] 17 to 22 [30 to 39]
83 °C to 110 °C
[181 °F to 230 °F]
±4 [±6] ±5 [±8] 8 to 16 [15 to 29]
±7 [±12] ±10 [±18] 45 to 56 [80 to 100]
±5 [±9] ±8 [±15] 34 to 45 [61 to 80]
±5 [±8] ±7 [±12] 28 to 34 [50 to 60]
±4 [±7] ±7 [±12] 22 to 27 [40 to 49]
±4 [±7] ±6 [±11] 17 to 22 [30 to 39]
111 °C to 150 °C
[231 °F to 302 °F]
±4 [±7] ±6 [±10] 14 to 16 [25 to 29]