Positive Break Enhances Safety in Hazardous Environments

Honeywell introduces its MICRO SWITCH™ GSX Series Explosion-Proof Safety Switch. The GSX Series combines world-class MICRO SWITCH™ global limit safety product (GSS) with an explosion-proof housing from Honeywell’s LSX and BX product lines. The GSX Series Safety Switch platform provides over 10,000 actuator and switching option combinations and can be applied to machine safety in hydrocarbon refining, chemical process, grain elevators, other agricultural or food processing equipment.

The GSX switch can be applied to a gate, cage or access panel that is positioned as hard guarding to a dangerous machine so that, when opened, the machine stops. Explosion-proof safety switches are required on machinery found in hazardous locations, where hazardous gasses or dusts could cause an explosion. The positive break mechanism will ensure that even welded contacts will open and the machine will stop in an emergency. The positive break feature is designed to provide a safe failure mode, ensuring the machine will not start, and therefore supporting a safer working environment.

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Explosion-proof switches help customers meet increasing safety, regulatory requirements anywhere in the world.

Honeywell announced it has received Electrotechnical Commission (IECEx) approval for its MICRO SWITCH™ BX explosionproof switch products. With IECEx approvals, manufacturers can specify one Honeywell MICRO SWITCH™ BX-series switch for a machine that will potentially be used in Europe, Asia or North America.

IECEx is the Commission’s certification of explosive atmospheres, and incorporates all existing approvals. Current North American UL/CSA and European ATEX approvals are being superseded by IECEx recognition. Honeywell’s explosion-proof switch family obtained certification from the official global regulatory agency.

"The global nature of approvals is critical to pull together many countries’ and territories’ regulatory requirements,” said Leslie Neill, global product marketing manager for Honeywell explosion-proof and safety switches.

“This allows our customers to apply our products almost anywhere in the world and meet ever-increasing levels of safety regulations. Honeywell offers a wide range of differentiated solutions to meet virtually any application requirement,” explained Brad Kautzer, vice president and general manager of electromechanical line of business for Honeywell Sensing and Control.

By obtaining the newest global standard for safety, Honeywell customers around the world can be assured their explosion-proof switches may meet all local safety regulations.  Honeywell BX Series explosion-proof limit switches are rugged products used in hazardouslocations, such as control valves in petrochemical, waste handling or food processing plants.  Honeywell MICRO SWITCH™ explosion-proof limit switches may be most appropriate for use in dangerous environments where contamination or long distances may render other sensing technologies ineffective.
 

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The 91MCE series limit switch is a compliment to Honeywell's existing product line of smaller, lower cost limit switches. Designed for modern industrial OEMs, the miniature package size fits in applications where space is limited. The small package size can be gang mounted for applications requiring more than two switch circuits. The 20mm mounting pattern meets most globally accepted mounting standards.

This product family offers the user many options including a variety of different actuator styles. Connection options include pre-leaded cable in various lengths or M12 connectors, both with side or bottom exits. Design flexibility is further enhanced with the availability of both slow action and snap action circuitry. Direct acting contacts are designed to open the NC contact when actuated. The epoxy-sealed rugged die-cast housing provides enhanced environmental durability.

FEATURES
• Direct acting contacts are designed to open NC contacts
   when actuated
• Sealed to IP67; NEMA 1, 4, 12, 13 suitable for outdoor
   applications
• CE, cULus, CCC approvals meet most global approvals
• Nine actuator styles offer design flexibility
• Slow-action and snap-action circuitry options
• Pre-leaded cable and M12 connector options
• Expected mechanical life: 5 million operations
• Side exit (standard) and bottom exit connection options

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General Information:
MICROSWITCH standard basic switches are precision snap-action mechanisms enclosed in accurately molded plastic cases. These switches are carefully manufactured and thoroughly inspected. They are industry-known for their compactness, light weight, accurate repeatability and long life.

BZ/BA Series Standard Basic Switches are used for simple on/off applications and meet the needs of most applications. However, modifications of contact design and material, spring configuration and plunger location create other types with greater electrical load handling capacity. Other changes in materials and switch design provide operating characteristics; temperature tolerances and sealing that cover a wide range of special requirements, for example;

SM Series Subminiature Basic Switches are used for simple or precision on/off application needs. These switches combine small size and light weight with ample electrical capacity, precision operation and long life.

SX Series Subminiature Basic Switches are used for simple or precision on/off application needs. They are small, precision snap-action switches that are ideal where savings in space and weight are important.

UM Series Subminiature Basic Switches are used for simple or precision ON/OFF application needs. These switches combine small size and light weight with ample electrical capacity, low cost and long life.

UX Series Subminiature Basic Switches are used for simple or precision on/off application needs. These are small, low-cost snap-action switches which are ideal where savings in space and weight are important.

V5 and V7 Series Basic Switches are used for simple or precision on/off, end of limit, presence/absence, pressure, temperature and manual operator interface application needs.

ZM Series Subminiature Basic Switches are used for simple or precision ON/OFF application needs. These switches combine small size and light weight with ample electrical capacity, low cost and long life.

ZW Series Subminiature Basic Switches are used for simple or precision ON/OFF application needs. These switches combine small size and light weight with ample electrical capacity, low cost and long life.

ZX Series Subminiature Basic Switches are used for simple or precision ON/OFF application needs. These switches combine small size and light weight with ample electrical capacity, low cost and long life

Features:
• Accepted world-wide standard micro switch
• Low operating force and differential travel
• Long mechanical life up to 20,000,000 cycles at 95% survival
• Elongated mounting hole for easier, more accurate mounting
• Current rating ranges from 15 A to 25 A
• Choice of actuation, termination and operating characteristics

Typical Applications:
• irrigation systems
• Semi-trailer trucks
• Timing devices
• Office equipment
• Test instruments
• Medical/dental equipment
• HVAC equipment
• Manually operated devices
• Valves
 

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Overview:
Includes standard size basics, miniature, subminiature, hermetically sealed, high temperature and special application switches. The precision snap-action mechanisms are available with a wide variety of actuators and operating characteristics. These products are often ideal for applications requiring compactness, light weight, accurate repeatability and long life. This family also includes pushbuttons, toggles, rockers, key switches and indicators for use where manual operation is desired.

http://content.honeywell.com/sensing/prodinfo/basicswitches/

Best Used For:
Used for presence/absence detection where physical contact with the object is permissible. Often ideal for applications requiring compactness, repeatability and long life.

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