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Mounting Rails (channels) manufactured and supplied by elmex comply with DIN/IEC standards (IEC 60715 - Dimensions of low-voltage switchgear and control gear - Standardized mounting on rails for mechanical support of electrical devices in switchgear and control gear installations).
DIN rails are available in 35 mm Top Hat section (7.5 mm and 15 mm deep), 32 mm ("G" Section) and 15 mm width. These channels are made of mild steel. Channels of 300, 500 and 1000 mm (with or without slot) are available as standard lengths. All channels are Alkaline Zinc plated with yellow or blue passivation. Channels with RoHS compliant plating are also available against special orders.
Dimensional accuracy is ensured through gauging during manufacturing process.
It is important that the channels used have accurate dimensions within permissible tolerances. If the mounting dimensions are less than specified then the attachment of the terminal blocks on these rails will not be strong enough and there could be problems of loose fittings and at times terminal blocks may get dislodged from the channel even in normal service conditions.
If the mounting dimensions are more than specified limits, the terminal will fit tighter than required and it would be difficult to move terminals on the rail or dismount it from the rail. At times this may lead to breakage of terminal blocks made from Melamine (thermoset).