M on American Crane & Equipment Corp.

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Crane and Hoist Equipment and Components by Type > Resource Center > Crane Glossary > M


	M
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		MAGNETIC CONTROL A means of controlling direction and speed by using magnetic contactors and relays.




		MAIN LINE CONTACTOR A magnetic contactor used in the incoming power circuit from the main line collectors.




		MAIN LINE DISCONNECT SWITCH A manual switch which breaks the power lines leading from the main line collectors.




		MANUAL-MAGNETIC DISCONNECT SWITCH A power disconnecting means consisting of a magnetic contactor that can be operated by remote pushbutton and can be manually operated by a handle on the switch.




		MASTER SWITCH A manually operated device which serves to govern the operation of contactors and auxiliary devices of an electric control.




		MATCH MARKING Identification of non-interchange-able parts for reassembly after shipment.




		MEAN EFFECTIVE LOAD A load used in durability calculations accounting for both maximum and minimum loads.




		MECHANICAL LOAD BRAKE An automatic type of friction brake used for controlling loads in the lowering direction. This unidirectional device requires torque from the motor to lower a load but does not impose additional load on the motor when lifting a load.




		MILL DUTY CRANE Service classification covered by AISE Standard No. 6, “Specification for Electric Over-head Traveling Cranes for Steel Mill Service".




		MODULAR HOIST A hoist machine that utilizes an integral drum, motor and gearcase. Also called a "package" hoist, due to the absence of visible shaft couplings between drum, motor and gearcase.




		MONORAIL CRANE A crane where the hoist is suspended from one or more trolleys that are supported by a single track.




		MULTIPLE GIRDER CRANE A crane which has two or more girders for supporting the live load.