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Mechanical SPDT and DPDT Switches
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| Switch & Sensor Specifications
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Moniteur selects the industry's best
mechanical switches to handle a wide variety of applications, meeting
the tough demands of today's process industries. A full range of
mechanical snap-acting switches is available, as shown in the table
below.
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Specifications - Mechanical
Switches
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Switch Type
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AC Rating
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DC Rating
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form
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SPDT (Cherry)
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15A - 250V
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2.5A - 24V
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C
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Gold Plated SPDT (Prism)
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1A - 120V
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1A - 24V
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C
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DPDT (ITW)
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10A - 250V
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7A - 24V
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CC
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Mechanical Switch Selection
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| Mechanical
SPDT switches are the most common
switch used due to their low cost and proven reliability for
general purpose applications. In addition to transmitting valve
position, the switch’s high amp rating can control a relay,
or other plant devices such as pumps or motors. |
| Mechanical
DPDT are used for simultaneous switching
functions when two independent signals must operate in tandem.
An example is when one switch sends a low level signal back
to the control room, and a second functions controls a relay
or another device. Warning: Moniteur DOES NOT recommend that two SPDT switches be
used in lieu of one DPDT for any application. |
| Gold plated
Mechanical switches are used in low
current, low voltage (primarily DC) applications. Gold plated
switch contacts assure signal stability at extremely low current
and voltages, and are often used as a low cost alternative in
Intrinsically Safe systems |
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