New! - Norman Equipment Co.

Series ZS441 Heavy-Duty Emergency Cable-Pull Switch Meets EN 418Typical ApplicationsZS441 emergency cable-pull switches are ideal for replacingmultiple, discrete E-stop pushbuttons or achieving acontinuous, immediately accessible emergency stop. Typicalapplications include conveyor lines, textile machinery,packaging machinery, turret lathes, power plants, gravelprocessing and transfer lines.®Features & Benefits• Rugged, corrosion-resistant, die-cast aluminumhousing … tolerates the most hostile environments.• “Positive-break” NC contacts … assure circuit interruptionupon pulling of trip wire.• Watertight design … meets IP65 requirements.• Continuous E-stop protection … for trip-wire spans up to82 feet (25m).• Meets rigid safety agency standards … EN 418• Available in three reset styles … pushbutton, key andnon-reset.• Available in three operating force models … forapplication compatibility.• Mounting accessories … ease and extend installation.• Built-in vibration tolerance … eliminates nuisancetripping.• Push/pull operation … actuates if trip-wire is pulled orgoes slack.DescriptionThe ZS441 Series is designed to provide a continuousemergency stop along exposed areas of machinery andconveyors which present hazards to operators/maintenancepersonnel. Unlike E-stop pushbuttons, emergency stop cablepullsystems can be actuated at any point along the “trip-wire.”The units feature positive-opening NC contacts which areforced open when the trip-wire is pulled. This design alsoassures machine stoppage if an operator falls into, leans on,or is pulled against the trip wire.In addition the switch is designed to operate if the trip wire iscut or goes slack. To comply with OSHA and other safetyregulations, the ZS441 features a manual mechanical resetwhich must be actuated before the controlled equipment canbe restarted.Their rugged metal housing and watertight design (IP65)make them ideal for achieving a higher degree of E-stopsafety in industrial and hostile environments.OperationThe ZS441 features an axial actuating shaft and a doublepolecontact block with 1 NO/1 NC or 2 NC contacts (with tripwireattached). When installed, the trip-wire is pre-tensioneduntil the actuating shaft is pulled out 6 mm, closing the opencontact.When the trip-wire is pulled, the positive-break NC contact isforced open via a direct mechanical linkage with the actuatingshaft. If the trip-wire goes slack (e.g. breaks or is cut) the NOcontact, closed during pre-tensioning, opens – resulting inequipment stoppage.Manual (key or pushbutton) reset mechanisms assure theequipment cannot be restarted until the reset is actuated.114Part NumberPL-M20-24VPL-M20-120VSTQ441-SCSTQ441-EBSTQ441-CCSTQ441-TBSTQ441-THSTQ441-PUNew! S900AVAILABLE ACCESSORIES®24V Pilot light kit120V Pilot light kitDescription5mm diameter steel cable, PVC coatedM10 eye bolt & hex nutCable clampTurnbuckleThimblePulley assembly (for cable "cornering")Cable-Pull Switch Wire Tensioner(see page 126)For recommended installation instructions, please see page 117.is a trademark of SCHMERSAL