PartMaterialSymbolCharacteristicsContactsGoldAuGold is extremely resistant to corrosion and is used for microloads. It is soft (Vickers
strength: HV25 to HV65), which easily results in adhesion (e.g., contacts sticking
together) and the contacts are easily dented if the Contact force is large.Gold-silver
alloyAuAgThis alloy of 90% Au and 10% Ag is extremely resistant to corrosion, and its hardness
(HV30 to HV90) is higher than that of gold, and so it is often used in switches for
microloads.Platinum-gold-
silver alloyPGSThis alloy of 69% Au, 25% Ag, and 6% Pt is extremely resistant to corrosion, its hardness
(HV60) is similar to AuAg, and it is often used in switches for microloads.Silver-
palladium
alloyAgPdThis alloy has good resistance against corrosion but it easily generates polymers if it
adsorbs organic gases.
With 50% Ag and 50% Pd, it has a hardness of HV100 to HV200.SilverAgSilver has the highest rate of electrical conductivity and heat transfer among metals. It
exhibits low Contact resistance, but has the disadvantage of easily generating a sulfide film
in environments with sulfide gas, and so Contact faults easily occur in microload ranges.
The hardness is HV25 to HV45. Silver is used in almost all switches for standard loads.Silver-nickel
alloyAgNiWith 90% Ag and 10% Ni, this alloy has electrical conductivity about equal to Ag, and it has
excellent resistance to arcing and welding.
The hardness is HV65 to HV115.Silver-indium-
tin alloyAgInSnThis alloy is very hard, has a high melting point, and exhibits excellent resistance to arcing,
welding, and Contact transfer.Movable
springs
and
armaturesPhosphor
bronze
for springsC5210Phosphor bronze is very ductile and has resistance against fatigue and corrosion. It is
annealed at low temperatures. The spring limit (Kb0.075) is somewhat low at 390 N/mm2
minimum for C5210-H and 460 N/mm2 minimum for C5210-EH, but it is often used for
armatures of miniature basic switches.Age-hardened
copper
beryllium
for springsC1700
C1720Copper beryllium is pressed and then age-hardened. It has a high rate of electrical
conductivity, and the spring limit (Kb0.075) after age hardening is extremely high at
885 N/mm2 minimum. for C1700-H and 930 N/mm2 minimum for C1720-H.
It is used for basic switches that require a high spring limit.Mill-hardened
copper beryllium
for springsC1700-[]M
C1720-[]MThis copper beryllium is age hardened by the materials manufacturer before shipment (i.e.,
mill hardened). Pressing after age hardening is not required. At 635 N/mm2 minimum
reference value) for C1700-HM and 635 N/mm2 for C1720-HM, the spring limit (Kb0.075)
is higher than with bronze phosphor for springs. Mill-hardened copper beryllium is often
used for the movable springs in basic switches.Stainless steel
for springs
(austenite)SUS301-CSP
SUS304-CSPAustenite stainless steel has excellent resistance against corrosion.
The spring limit (Kb0.075) is 490 N/mm2 minimum for SUS301-CSP-H and 390 N/mm2 for
SUS304-CSP-H.Cases and
coversPhenol resinPFPhenol resin is heat hardened. It is often used as the material for the casings of basic
switches.
Phenol resin has a UL heat index of 150°C, a UL fire-retardant grade of at least 94V-1, and
a water absorption coefficient of 0.1% to 0.3%. Material without ammonia is used for basic
switches.Polybutylene
terephthalate
resinPBTPThis resin is thermoplastic. A glass-reinforced epoxy type of this resin is often used as the
material for the casings of basic switches.
The resin has a UL heat index of 130°C, a UL fire-retardant grade of at least 94V-1, and a
water absorption coefficient of 0.07 to 0.1.Polyethylene
terephthalate
resinPETPThis resin is thermoplastic. A glass-reinforced epoxy type of this resin is used as the
material for the casings of basic switches.
The resin has a UL heat index of 130°C, a UL fire-retardant grade of at least 94V-1, and a
water absorption coefficient of 0.07 to 0.1.Polyamide
(nylon)
resinPAThis resin is thermoplastic. A glass-reinforced epoxy type of this resin has heat resistance
that is superior to PBT and PET. The absorption coefficient is large. Select a grade for use
with a the lowest possible absorption rate.
The resin has a UL heat index of 180°C, a UL fire-retardant grade of at least 94V-1, and a
water absorption coefficient of 0.2 to 1.2.Polyphenylene
sulfidePPSThis resin is thermoplastic. It has heat resistance that is superior even to PA.
The resin has a UL heat index of 200°C, a UL fire-retardant grade of at least 94V-1, and a
water absorption coefficient of 0.1.Switch
boxesAluminum
(die-cast)ADCAluminum is often used as the material for the switch box (case) of Limit Switches.
Standards are specified in JIS H5302.Zinc
(die-cast)ZDCDie-cast zinc is more suitable than ADC for thin-walled objects, and its resistance to
corrosion is also superior to ADC.
Standards are specified in JIS H5301.Rubber
sealsNitrile-
butadiene
rubberNBRThis rubber has excellent resistance to oil, and it is often used for Limit Switches. It is
classified into five nitrile levels according to the amount of combined nitrile: Very high
(43% or higher), high (36% to 42%), mid-high (31% to 35%), medium (25% to 30%), and low
(24% or lower). Resistance to oil, heat, and cold somewhat vary with each level. The
ambient operating temperature ranges from -40 to 130°C.Silicon rubberSIRSilicon rubber has excellent resistance to heat and cold, and the ambient operating
temperature ranges from -70 to 280°C. Its resistance to oil, however, is inferior.Fluorine
rubberFRMFluorine rubber has resistance to heat, cold, and oil that is superior even to NBR and SIR.
Depending on the constituents of the oil, however, the oil resistance may be inferior to NBR.Chloroprene
rubberCRChloroprene rubber has good resistance against ozone and climatic conditions. It is often
used as the material for basic switches that require resistance against climatic conditions.

What Are the Advantages of Sealed Limit Switch?

A sealed limit switch is a type of switch that is designed to prevent the ingress of dust, water, or other contaminants into the switch mechanism. These switches are commonly used in harsh environments such as manufacturing plants, offshore oil rigs, and transportation systems where exposure to dust, moisture, and other contaminants can compromise the reliability of standard switches.

Sealed limit switches are available in various designs, including heavy-duty, miniature, and hazardous area switches. Heavy-duty sealed limit switches are typically constructed from stainless steel or other sturdy materials, enabling them to withstand harsh chemicals, extreme temperatures, and physical impact. Miniature sealed limit switches are designed for compact spaces and are often utilized in small equipment such as medical devices, robotics, and drones. Hazardous area switches are engineered to meet stringent safety standards for environments with explosion or fire risks, such as chemical processing plants and refineries.

Benefits of Sealed Limit Switches

One of the primary benefits of sealed limit switches is their reliability in harsh environments. By preventing the ingress of contaminants, these switches can maintain their functionality and avoid malfunctions that could lead to equipment failure or safety hazards. This reliability is critical in industries where downtime and safety risks could have severe consequences.

Sealed limit switches are also built with longevity in mind. Constructed from durable materials, they are designed to withstand repeated use over time, minimizing the need for frequent maintenance or replacement. This durability helps to reduce the total cost of ownership of the equipment in which they are installed.

Another major advantage is their versatility. Sealed limit switches can be utilized in a wide range of applications, including machinery, transportation systems, and industrial automation. This versatility stems from their rugged design, ability to endure harsh environments, and capacity to operate across a broad temperature range.

In conclusion, sealed limit switches are essential components in numerous industrial applications where reliability and safety are paramount. Their ability to prevent contaminant ingress while maintaining durability in tough conditions ensures they play a vital role in preserving equipment functionality and mitigating safety hazards. With their adaptability and long service life, sealed limit switches remain invaluable in various industries.

Contact us to discuss your requirements of Stainless Steel Spring Limit Switch. Our experienced sales team can help you identify the options that best suit your needs.

TMAZTZ is engaged in the manufacture and sale of many kinds of sealed limit switches, welcome to TMAZTZ - China Sealed Limit Switch Factory. As a leading manufacturer and supplier of sealed limit switches in China, our company specializes in providing high-quality and reliable TSA sealed limit switches to customers worldwide. Our TSA sealed limit switches are designed to withstand harsh environments, making them ideal for use in industrial and commercial applications where dust, moisture, and other contaminants are present.

Our sealed limit switches are made using premium quality materials and are designed to provide long-lasting performance even in extreme conditions. We offer a wide range of sealed limit switches to suit various applications, including snap action limit switches, heavy-duty limit switches, and miniature limit switches.

All our sealed limit switches are thoroughly tested and inspected to ensure that they meet the highest standards of quality and reliability. We also offer customized solutions to meet specific customer requirements and provide timely and efficient customer support to ensure complete customer satisfaction.

Our commitment to quality and customer satisfaction has made us a trusted name in the sealed limit switch industry. Whether you are looking for a standard or custom-made sealed limit switch, we have the expertise and resources to meet your needs. Contact us today to learn more about our China supply sealed limit switch and how we can help you find the perfect solution for your application.

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