反戈一击什么意思Upper Limit Temperature Protection电脑窗口
MICROTEMP®thermal cutoffs from Therm-O-Disc offer an accurate, reliable solution to the
need for upper limit temperature protection. Known as a thermal fu, thermal link, or TCO, the MICROTEMP® thermal cutoff provides protection against overheating by interrupting an electrical
circuit when operating temperatures exceed the rated temperature of the cutoff.
MICROTEMP® Features:
• One-shot operation cuts off electrical power
• Current interrupt capacity up to 25 amps @ 250VAC
• Low resistance
• Compact size
Operating Principle of the MICROTEMP® TCO
The active trigger mechanism of the thermal cutoff is an exclusively formulated, electrically nonconductive pellet. Under normal operating temperatures, the solid pellet holds spring-loaded
contacts clod.
When a predetermined temperature is reached, the pellet melts, allowing the compression spring
to relax. The trip spring then slides the contact away from the lead and the circuit is opened (e
figures 1 and 2).
After a MICROTEMP® thermal cutoff opens a circuit, the TCO needs to be replaced. This
replacement procedure must include correction of the fault condition before the product is
operated again.
1
MICROTEMP® G4, G6 & G7 Series TCO
Figure 1 MICROTEMP® G5 & G8 Series TCO
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Figure 2
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MICROTEMP® thermal cutoffs are available in a range of temperatures and electrical ratings to meet application requirements (e Microtemp® Operating Temperature Summary and Electrical Rating
Summary on page 4). There are 5 primary types of thermal cutoffs available. Standard dimensions
of each TCO ries are shown on page 4.
G Series: This “Global” ries or G designation reprents the world standard in thermal cutoffs. MICROTEMP®TCOs were the first chemical-pellet spring-type TCO ever developed and continue to be
the thermal cutoff of choice for over 35 years.
E Series: This new “Environmentally” friendly ries holds Agency recognition equivalent to the G
ries and has been designed to comply with the Restriction of Hazardous Substances in Electrical
and Electronic Equipment (ROHS) Directive (2002/95/EC). None of the substances specified in this
Directive have been intentionally incorporated into the E-ries products.
G4 Series
Rated for continuous operating currents up to 10 amps @ 250VAC (15 amps @ 120VAC, 5 amps @
24VDC), the G4 ries MICROTEMP® TCO is the industry standard for over-temperature protection.
The G4 ries is applied to millions of appliances and personal care products each year, providing
reliable back-up protection for temperature controlling thermostats and other over-temperature conditions. The G4 ries is also widely applied in office machines, portable heaters and industrial equipment as a thermal safeguard.
G5 Series
Designed for higher voltage and current applications than the G4, the G5 ries MICROTEMP®
TCO is rated for operating currents up to 20 amps @ 250VAC and 277 VAC (25 amps @ 120VAC).
Similar in appearance to the G4 ries, the G5 ries has a different internal construction designed
for interrupting higher currents and withstanding higher temperatures.
G6 Series
The G6 ries MICROTEMP® TCO can be utilized in applications where a higher maximum-overshoot temperature rating is not required, yet it is rated for operating currents up to 16 amps @ 250VAC. It
is the same physical size as the G4, G5 and G8 ries TCOs.
G7 Series
The G7 ries MICROTEMP® TCO is designed to satisfy applications requiring miniaturized compo
nents
that do not need maximum current interrupt capability. The G7 is just 2/3 the size of the G4 and G5,
and with a current interrupting capability of 5 amps @ 250VAC (5 amps @ 24VDC), it is capable of
meeting the requirements of transformers, motors, battery packs and electronic circuit applications.
G8 Series
Designed for very high-current applications such as major appliances and high-wattage electric heat packages, the G8 ries MICROTEMP® TCO is rated for operating currents up to 25 amps @ 250VAC
(20 amps @ 277VAC). More economical than electromechanical bimetal-type one shot devices, it can
be utilized in applications where its small size is an advantage in terms of mounting (it’s the same旺仔牛奶
physical size as the G4, G5 and G6 ries TCOs) and thermal respon.
3
4MICROTEMP® TCO Operating Temperature Summary
5
Packaged Thermal Cutoffs
Therm-O-Disc also offers a variety of packaging options for MICROTEMP ® thermal cutoffs.Therm-O-Disc offers two standard packages with wide application in the HVAC industry. Primarily designed for heating applications, the GXAM04 and GXAM06 packages mount a standard G4, G5, G6 or G8 TCO in a high temperature ceramic ba (e figure 3).
The popular GXAP Potted TCO packages consist of a TCO epoxy-potted into a plastic insulating mounting ca. The asmbly can be supplied with various ca materials, shapes and terminations. They can be ud to accurately n temperature as probes and as surface, airstream and ambient nsors (e figure 4). They can be easily replaced in the field without disturbing the rest of the circuit.Custom packages, insulations or special asmblies may be specified to meet specific unique
application needs. By taking advantage of our technical experti and high volume production methods and equipment, we can provide significant savings on custom packages.
Packaged TCO Material Specifications
Figure 4
GXAP04
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GXAP02学做菜家常菜
GXAP12
GXAP05
GXAP01 PBT Glass Filled 120 134 GXAP02 PPS Glass Filled 220 192 GXAP04 PBT Glass Filled 120 134 GXAP05 PBT Glass Filled 120 134 GXAP10 PPS Mineral Filled 220 192 GXAP12 PBT Glass Filled
120 134 GXAM04 Ceramic DIN VDE 0335, C 221 >250 260 GXAM06 Ceramic DIN VDE 0335, C 221
>250 260
GXAM11
PBT
120
134
Figure 3
*Additional ratings available upon request.
GXAM11
