Datasheet

Honeywell Sensing and Control 9
Figure 6. 2455RM/2450CM Series Phenolic or Ceramic Manual Reset Thermostats
The 2455RM (phenolic)/2450CM (ceramic) 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. 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, 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 10. 2455RM 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]
Table 11. 2450CM 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 149 °C [251 °F to 300 °F] ±7 [±12]
150 °C to 177 °C [301 °F to 350 °F] ±8 [±15]
177 °C to 204 °C [351 °F to 400 °F] ±10 [±18]
205 °C to 232 °C [401 °F to 450 °F] ±11 [±20]