Datasheet

Honeywell Sensing and Control 11
Figure 8. 2455RD Series Phenolic Manual Reset
The 2455RD Series is a single pole, single throw, snap-
acting, non-adjustable thermostat. 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 housing; the bimetal
disc is retained by a metal heat-conducting end cap. The
circuit remains open above the room ambient temperature
until the manual reset button is depressed. (These devices
are constructed with an additional steel disc so that they are
manual reset only. They do not have an automatic reset.)
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. For increased sensitivity, an exposed bimetal disc
may be specified. A variety of mounting brackets and
terminals is available.
All versions are UL/CSA and European approved.
Potential applications include those where a manual reset is
desired, including:
• Power supplies
• Appliances
• Medical equipment
• Water heaters
• Office automation
• Industrial equipment
• HVAC equipment
Table 14. 2455RD Series Standard Temperature Characteristics
Operating Temperature Range Tolerance °C [°F]
52 °C to 93 °C [125 °F to 200 °F] ±5 [±8]
94 °C to 121 °C [201 °F to 250 °F] ±6 [±10]
122 °C to 150 °C [251 °F to 302 °F] ±7 [±12]