ZS71 Emergency Cable-Pull Switch (Meets EN418) Features & Benefits • Rugged, corrosion-resistant, die-cast aluminum housing … tolerates the most hostile environments. • “Positive-break” NC contact … assures circuit interruption upon pulling of trip wire. • Visual position indicator … for ease of installation. • Push/pull operation … actuates if trip-wire is pulled or goes slack. • Watertight design … meets IP65 requirements, equipped with watertight collar. • Continuous E-stop protection … for supported trip-wire spans up to 65 feet (20m). • Meets rigid safety standards … UL, CSA. • Low actuating force … operates with only 13.5 lbs of force. Ideal for short-run applications. • Explosion protected … optional IEC-rated explosion-proof ® models available. • Mounting accessories … ease and extend installation. • Optional integrated emergency-stop button … for easy Description actuation when in proximity to switch. The ZS71 is designed to provide continuous emergency stop along exposed areas of machinery and conveyors which present hazards to operators/maintenance personnel. Unlike E-stop pushbuttons, emergency-stop cable-pull systems can be actuated at any point along the “trip-wire.” The unit features a positive-opening NC contact which is forced open when the trip-wire is pulled. This design also assures actuation if the operator falls into, leans on, or is pushed against the trip-wire. In addition, the switch is designed to operate if the trip wire is cut or goes slack. Their rugged metal housing, small size and watertight design (IP65) make them ideal for use in hostile environments where space is limited. Operation The ZS71 features an axial actuating shaft and a double-pole contact block with either 1 NO & 1 NC or 2 NC contacts (with trip-wire pre-tensioned). When the trip-wire is pulled, the positive-break NC contact is forced open via a direct mechanical linkage with the actuating shaft. If the trip-wire goes slack (e.g. breaks or is cut) the NC contact opens – resulting in equipment stoppage. Manual (key or pushbutton) reset mechanisms assure the equipment cannot be restarted until the reset is actuated. Optional integrated emergency-stop button on face of switch assures complete emergency stop. Typical Applications The ZS71 is ideal for replacing multiple, discrete E-stop pushbuttons or achieving a continuous immediately accessible emergency stop … especially where space is limited. Typical applications include conveyor lines, textile machinery, packaging machinery, turret lathes, and transfer lines. ® is a trademark of SCHMERSAL 102 ZS71 AVAILABLE MODELS AND ACCESSORIES AVAILABLE STANDARD MODELS Typical Maximum Contact Type Pre-Tensioned Part Number Actuating Cable Configuration Reset Force Force (F) Length ZS71-10/1S WVDA-55N* 1 NO & 1 NC Pushbutton 12.5 lbs (55N) 1.4 lbs (6N) 32.5 ft (10m) ZS71-10/1S WVDA* 1 NO & 1 NC Pushbutton 45.5 lbs (200N) 6 lbs (25N) 65 ft (20m) ZS71-10/1S WVSA-55N* 1 NO & 1 NC Key 12.5 lbs (55N) 1.4 lbs (6N) 32.5 ft (10m) ZS71-10/1S WVSA* 1 NO & 1 NC Key 45.5 lbs (200N) 6 lbs (25N) 65 ft (20m) ZS71-20 WVDA-55N 2 NC Pushbutton 12.5 lbs (55N) 1.4 lbs (6N) 32.5 ft (10m) ZS71-20 WVDA 2 NC Pushbutton 45.5 lbs (200N) 6 lbs (25N) 65 ft (20m) ZS71-20 WVSA-55N 2 NC Key 12.5 lbs (55N) 1.4 lbs (6N) 32.5 ft (10m) ZS71-20 WVSA 2 NC Key 45.5 lbs (200N) 6 lbs (25N) 65 ft (20m)  ZS71-10/1S WVD-NA-55N 1 NO & 1 NC Pushbutton 12.5 lbs (55N) 1.4 lbs (6N) 32.5 ft (10m)  ZS71-10/1S WVD-NA 1 NO & 1 NC Pushbutton 45.5 lbs (200N) 6 lbs (25N) 65 ft (20m)  ZS71-20WVD-NA-55N 2 NC Pushbutton 12.5 lbs (55N) 1.4 lbs (6N) 32.5 ft (10m)  ZS71-20WVD-NA 2 NC Pushbutton 45.5 lbs (200N) 6 lbs (25N) 65 ft (20m) *Available in an IEC-rated explosion-proof design. To order, add prefix “EEX” to part number.  Equipped with integral emergency stop button. 4 AVAILABLE ACCESSORIES Part Number Description PL-M20-24V 24V Pilot light kit PL-M20-120V 120V Pilot light kit STQ441-SC 5mm diameter steel cable, PVC coated STQ441-EB M10 eye bolt & hex nut STQ441-CC Cable clamp STQ441-TB Turnbuckle STQ441-TH Thimble STQ441-PU Pulley assembly (for cable "cornering") Cable-Pull Switch Wire Tensioner New! S900 (see page 126) For recommended installation instructions, please see page 117. ZS71-10/1S WVD-NA Emergency pushbutton option 103 ZS71 TECHNICAL DATA MECHANICAL SPECIFICATIONS ELECTRICAL SPECIFICATIONS Housing Die-cast aluminum with fiberglass- Contacts Fine silver reinforced thermoplastic cover Contact Configuration 1 NO & 1 NC or 2 NC double- Degree of Protection IP65 (pushbutton reset) pole, double-break with IP54 (key reset) electrically-separated contact bridges Maximum Supported 65 feet (20m) Span Contact Rating 6A/400VAC Operating Temperature –13°F to +158°F (–25°C to +70°C) Switching Action Snap-action, positive-break NC contacts (with wire pulling). Snap- Mechanical Life 1 million operations action NO contact. Conformity to Standards EN418, UL, CSA Short Circuit Protection 6A (external) Minimum Cable Tension 6.7 lbs. (30N) Type Terminals Screw terminals with clamping Typical Deflection (S) 4.4" (11cm) washers Required for Operation -10 0 10 20 30 40 50 60 70 T(°C) 2 4 6 8 10 12 14 16 18 20 l (m) Cable length vs. temperature range At 3m distance, intermediate wire supports are required, DIMENSIONS see accessories. 104 ZS71 TECHNICAL DATA DIMENSIONS 40 1.57 30 10 1.18 .39 18 .71 24 .94 48 1.89 33 1.30 mm M20 17,5 15 52 inch 2.05 .69 .59 42 1.65 4 SWITCHING DIAGRAMS & CONTACT SCHEMATICS 105 105 4.13 22 53,5 8 .87 .31 2.11 6 .24 ø10 .39 56 2.20 12 .47 ø25 .98 56 2.20