Why do we need spark proof switches?

It is not unusual for a small spark to be seen inside a switch when it is turned on and off.  The spark occurs when electricity jumps between the contacts as they pull away from each other.  For appliances that use flammable gases or operate within hazardous environments, a spark can cause the ignitable gases, vapours or dust to explode.  Subsequently, considerable thought must be given to the type of switch used in these applications.  For the switch products we supply at Alan Butcher Components, applications can include:

• Refrigerators
• Freezers
• Chilled drinks dispensers and vending machines
• Cooling cabinets for medical or laboratory applications
• Machinery within grain stores (excessive levels of dust)

Our Italian switch manufacturer, Everel offers spark proof switches tested to IEC 60079-1:2014.  This test ensures there is no ignition of an explosive atmosphere surrounding the device whilst it is energised.   A copy of the test certificate can be downloaded here – IMQ AC.01457_Switches test certificate.  The Everel explosion proof switches are designed to ensure the electrical contacts are contained within a non-explosive housing.  This eliminates the risk of a spark outside of the enclosure.

Spark Proof Switches Within the Everel Range

Everel has extended its range of explosion proof switches. Single Pole and Double Pole, On-Off switches are now produced within the following ranges:

A1 Series – rocker switch, 13x19mm cutout  

SXL5 Series – push button switch, rear panel mount

B4MASK Series – IP65 rocker switch, 22x30mm cutout

SX81 Series – rocker switch, 11x22mm cutout

SX82 Series – rocker switch, 22x30mm cutout

These are specialist switches which are manufactured to order so please contact us to discuss the options available. We will be happy to provide a quotation and sample, along with data and information on minimum order quantities.

Stocked spark proof switch – SX81111811230T00

Currently we hold stock of the SX81111811230T00 in our Blandford warehouse. This is an all-black rocker switch, SPST, 10A with ON OFF marking. The panel cut out is 11x30mm. Please call us for a quotation or to request a sample.

As mentioned, spark proof switches / explosion proof switches are used in quite specific applications so for more information, please give us a call. Contact us on:

01258 456360
sales@abcomponents.co.uk

For more information on Why do we need spark proof switches? talk to Alan Butcher Components Ltd