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  Hubbell - Hubbell Industrial Controls - Hubbell Limit Switches

Limit Switch Type 4220 D-C Limit Switches are devices that are used to interrupt the main power circuit, setting up a dynamic braking circuit that quickly stops hook travel with a minimum of drift.   A-C Limit Switches are similar in construction to D-C Limit Switches.  The difference is in operation.  A-C Limit Switches disconnect two power lines to the hoist motor which then is stopped by a magnetic brake. Type 4225 Euclid quick break limit switches for hoists are normally closed by the weight of the striking lever.  The movement of the lever on its upward travel, when engaged by the hoist hook block on its upward travel, causes the switch to quickly break the circuit to the motor with very little upward movement of the crane hook.  The switch is automatically reset by the weight of the striking lever when the hook is lowered.

Hubbell - Hubbell Industrial Controls - Hubbell Limit Switches

Hubbell Industrial Controls ►AC Magnetic Motor Controls ►Solid State Motor Controls ►AC/DC Contactors/Relays ►DC Magnetic Motor Controls ►Disconnect Switches ►Drum Controls ►Electronic Components ►Limit Switches ►Magnet Controls & Accessories ►Master Switches ►Movable Bridge Controllers ►Neutral  Grounding Resistors ►Pendant Pushbutton Stations ►Power Resistors ►Sensors ►Speed Switches