The PBX-R is a robust and reliable positive-action microswitch for low and medium power ranges and the harshest environments. Equipped with self-cleaning V-shaped contacts, incredibly durable and robust, the PBX-R offers numerous advantages.
Approved by leading international railway organizations and meeting the most stringent standards, the PBX-R is an ideal choice for a wide range of applications in the rolling stock such as master controller, emergency break and circuit breaker, and for the railway infrastructure like the switchgear, automatic barrier, earth switch and more.
The PBX-R also offers numerous advantages for engineering and design departments wishing to use it on a project:
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General Use Of Microswitches:
Microswitches have become indispensable in the sensing and control industry for controlling electrical signals. With years of experience, Johnson Electric has supplied billions of microswitches used in home appliances, industrial equipment, automotive applications, agricultural machinery, and control systems worldwide. In most applications, the requirements for the switches are quite simple: they consist of at least two contacts, a common contact with either a normally open contact or a normally closed contact, connected to a snap-action mechanism to switch between the contacts and turn devices on and off. While these switches can operate safely and reliably in general applications, they have limited capabilities in various harsh environments. For this reason, sealed microswitches emerged as a viable solution. Sealed microswitches are basically the same as un-sealed microswitches with the addition of a protection against dust or moisture to enter the switch and reach the contact system.
Microswitches in Home, Industrial, or Automotive Applications:
The requirements for switches, however, can be extremely demanding in environments with high humidity, such as certain household appliances (dishwashers, coffee machines, etc.) or in industrial and automotive applications. Besides water, oil and dust can have a major impact on the applications, sudden temperature changes can also affect the proper functioning. It requires a high degree of sealing to ensure that the switches work without any problems. For example, this sealing should not only withstand the standard temperature range of -40°C to +85°C, but also function at higher temperatures or unexpected temperature drops. These specific applications therefore require a balanced and customized solution in sealing technology, regarding materials, switch- and seal design.
Sealing Technology:
To achieve sealing against dust or water, a "flexible" membrane must be fitted on all switch parts that have an open connection between the internal mechanism of the switch and the outside world. Such parts may be the plunger, the housing parts, or the terminal outputs. In the case of the plunger, the membrane must be flexible; in other areas, a more rigid seal may be sufficient. Consequently, for the microswitch to be manufactured properly and to ensure its function for a long time in harsh environment, the choice of sealing materials is crucial. Adding a seal to a microswitch affects its operating characteristics. In the case of the plunger, adding a seal usually increases the operating force. On the terminals, the seal can limit the soldering time to prevent overheating.
To provide a high-quality seal, Johnson Electric uses either a seal ring mounted separately on the plunger or twin-shot technology to provide housing parts with built-in seals. Different technologies are used for the housing parts and terminals. For example, either by ultrasonic welding of housing parts or by applying a special glue. By applying these solutions, the microswitches can be qualified with the IP67 degree of protection. When open terminals are used, IP protection is limited to the top or plunger side.
Johnson Electric Offer:
Johnson Electric's qualified switches are used to accurately detect the position of mechanical components in industrial and household applications. Additionally, to ensure 360-degree protection of the microswitch, Johnson Electric offers the option of adding moisture protection on the terminal side with lead wires soldered to the switch terminals. These lead wires are then routed through a cable box and potted to ensure IP67 protection on the terminal side. If the switch is UL approved the wires must also be UL approved. The final microswitch product is an IP67-protected switch with an operating temperature range between -40°C and +85°C according to UL61058 and even up to +125°C on demand.
Sealed switches are available in a wide range of sizes and ratings. The most common series are L16, V4NS, F1NS, V3S, 4BR, V9N and TS sealed switch families. Except for the TS, all other switches can be supplied with regular levers or terminals. All mentioned switch families have a UL or/and ENEC approval.
Conclusion:
Johnson Electric can offer you a complete program of sealed switches. The features of these switches include compact size, high lifetime, a high level of protection, and increased electrical properties, etc. There are different types of microswitches, but their selection depends on the requirement. To support you with the correct switch selection please contact our sales department for more information.
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Crouzet Universal Digital Timers
Crouzet Limit Switches
GNAD Series Solid State Relay
MilleniumSlim
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Limit switches indicate valves position to control water flow
Safe drinking-water, sanitation and hygiene are crucial to human health and well-being. Safe water is not only a prerequisite to health, but contributes to livelihoods, school attendance and helps create healthy, resilient communities.
Micro sewage systems protect groundwater against wastewater contamination in living areas isolated from public sewage infrastructures.
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DG Sub-Miniature Switch
• Extremely small dimensions – only 12.8 x 5.8 x 6.5 mm
• Breaking capacity ranges from small switching currents and voltages to low-voltage applications up to 3 A 125 VAC
• Available with or without auxiliary actuator
• Use on circuit boards with connections to the left or right and standing
• Operating temperature -25 to +85 °C
• High mechanical operating life > 1,000.000 operations (model dependant)
• Degree of protection IP40
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D4 Switch
ZF Friedrichshafen AG’s D4 miniature snap action switch has been an industry standard for many years. Originally this style of switch became popular with appliance manufacturers, due to its small size and excellent current carrying capabilities.
The D4 series benefits from an increased tracking resistance of PTI 300, a high functional reliability, and excellent switching precision. Using application-specific contact materials for switching currents from 0.1A up to 21A at 250VAC, the switches offer superior contact reliability. Due to several available actuators and mounting points, the devices will prove suitable for many different applications.
ZF are pleased to confirm approval has recently been received for the NCKL2/8 UL certificate which applies to the D4 range. They are now certified as ignition protected against new refrigerants which are being used within domestic white goods including refrigerators, ice machines, heat pumps and air conditioning units.
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PS product range offers varied applications thanks to modular design
The Schmersal Group launches a new generation of position switches. The benefits for the user: The new PS product range offers varied applications, as all the position switches can be used both as complete devices and as modular units.
Type 1 position switches in line with ISO 14119 are for the position detection and monitoring of moving parts on machinery and plants as well as for lateral or pivotable protection equipment. The new range is suitable for a wide range of applications across all individual disciplines of machine and plant engineering - both for automation and safety applications and for lift engineering. The protection types IP66 or IP67 create the prerequisites for using the position switch in unfavourable environmental conditions.
Fewer variants - more flexibility
The modular design of the PS range with consistent components across all models reduces the number of variants, reduces storage costs and increases availability. All the position switches in the PS116, PS2xx and PS3xx ranges available within the modular system can be chosen both as complete switches with actuating element or as basic switches. Depending on the application, the basic switches can be combined with the necessary actuating element, which can be selected from a range of possible versions. This achieves the greatest possible flexibility in application and at the same time reduces the number of different switches available.
All actuating elements can be rotated in 45° increments, allowing adjustment to the defined direction of motion at any time. The connection terminals are also rotated around 45°, which makes connection easier and significantly reduces installation times. Switching elements with up to three contacts guarantee a redundant shutdown with an additional signal contact.
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Honeywell is pleased to announce an upgrade to the Micro Switch SZL-VL Series Limit Switch effective May 2017.
The new product features include the addition of positive opening contacts (side rotary version only), enhanced sealing level to IP67; NEMA 1, 12, 13, extended the temperature range, and added CCC certification.
The upgraded design includes modified seals, housing and a new design cable gland to improve seal performance. The housing design and mounting hole pattern remain the same. Any dimensional changes do not exceed more than 1mm.
These product enhancements will allow the potential for use in wide variety of applications as well as bring more value to our customers.
The upgrades to the SZL-VL Series require that we introduce new part numbers and obsolete the existing SZL-VL part numbers.
Value to Customers
Honeywell Micro Switch SZL-VL-S Series Miniature Limit Switches have user-friendly interfaces and may be used in a broad range of applications to help meet the challenges of many industrial environments. A variety of actuators fit on the same platform reducing the need to use various kinds of mounting hardware.
With robust environmental ratings, the SZL-VL-S is protected for all kinds of industrial applications. IP67 indicates that the SZL-VL-S is protected against the effect of immersion in water between 15 cm and 1 m. The competition standard is IP65 which can only withstand low pressure spray and jets of water. The electrical rating of 10 A permits the SZL-VL-S switch to be used with heavier electrical loads than competitors.
Key Features
* Approvals: CCC, CE, cULus
* Sealed to IP67, NEMA 1, 12, 13
* Snap-action contacts
* Die-cast metal housing with glass-filled, flame-retardant thermoplastic cover
* Stainless steel levers with either steel and nylon rollers
* Variety of actuators
* Positive-opening contacts (plunger version only)
* RoHS compliant
* Utilization category:
>AC-15 A300 (380 Vac/0.5 A)
>DC-13 Q300 (220 Vdc/0.05 A)
* Mechanical life rating: 10 million cycles
* Electrical life rating: 0.5 million cycles
Potential Applications
* Commercial appliances
* Exhaust and fume hood door monitoring
* Lift mechanisms inside high-density parking garages
* Logistic facilities
* Machine electrical interlock
* Machine position sensing
* Ramp up and down position monitoring
* Scissor and man lifts
* Vending machines
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UK distributor of electrical and electronic components.
