Datasheet
High Temperature Premium Large Basic Switches
HT Series
DESCRIPTION
Honeywell HT Series high temperature premium large basic
switches are designed for extreme environmental temperature
applications. The HT Series is designed for continuous use in
temperature environments up to 538 °C [1000 °F]. The switch
design incorporates a high temperature snap switch mechanism
and stainless steel housing with a ceramic base which is
well suited for high temperature environments typically found
in commercial and industrial applications. The HT Series is
electrically rated up to 250 VAC with UL and CSA certifications.
Overall housing dimensions for the switch (1.96 in L x 0.70
in W x 1.25 in H) are optimal where there is limited space on
equipment.
VALUE TO CUSTOMERS
• Designed for a wide temperature range with a continuous
upper temperature of 538 °C [1000 °F]
• Preferred for high temperature applications, the reliability of
the HT Series limit switches minimize equipment downtime
which results in increased equipment productivity and cost
savings
FEATURES
• Designed for high temperature applications, up to 538 °C
[1000 °F] for continuous use
• High-temperature snap-spring design provides stable switch
characteristics
• Different styles of integral actuators: standard pin plunger or
for additional overtravel, radius plunger or inline roller plunger
styles are available
• Stainless steel actuators and housings with a ceramic base
• Side mount to the common 25,4 mm [1.00 in] centers or panel
mount with a 15/32 [0.469] inch diameter hole
• Certifications for UL and CSA
POTENTIAL APPLICATIONS
• Valve position sensing for aircraft engines
• Industrial incinerators for door position
• Industrial ovens for door position
DIFFERENTIATION
• Only manufacturer to offer a high temperature 538 °C
[1000 °F] rated electromechanical switch in a small size
package
PORTFOLIO
In addition to the HT Series high temperature switches,
Honeywell offers a complete range of sealed switches for aircraft
and military systems. The sealed switches include the EN Series,
HM Series, HE Series, HR Series, HS Series, SE Series, and XE
Series.
Sensing and Productivity Solutions
003129
Issue 1
2 sensing.honeywell.com
High Temperature Premium Large Basic Switches, HT Series
Table 1. Specifications
Characteristic Parameter
Description High temperature unsealed premium large basic switch
Certifications UL & CSA
Housing material Stainless steel housing with a ceramic base
Actuators Pin plunger, large diameter pin plunger with bushing mount, inline roller plunger with bushing mount
Contacts Fine silver and silver alloy
Circuitry 1PDT (one-pole double-throw)
Electrical rating 3 A, 1/10 HP @ 125 Vac or 2 A, 1/6 HP @ 250 Vac
Electrical termination Stainless steel 6-32 threads with hex nuts
Mechanical endurance 6000 cycles
Electrical endurance 6000 cycles
Dielectric strength (initial)
1000 VRMS, 500 mA max. leakage
Environmental sealing Unsealed
Temperature range -54 °C to 538 °C [-67 °F to 1000 °F]
HT SERIES SWITCHES
The HT Series basic switches are designed with a high-
temperature snap-spring mechanism in a stainless steel housing
with a ceramic base. Installation of the switch is accomplished
with side mount on 25,4 mm [1.00 in] centers or panel mount with
a 15/32 [0.469] inch diameter threaded bushing. The panel mount
style (threaded bushing) provides additional overtravel for the
application.
Electrical connections for the HT Series switches are #6-32
stainless steel threaded terminals integral to the switch with hex
nuts supplied with the switches.
CIRCUITRY
1PDT