M-20 Key Switch (Standard) Publication Number: PB3041 DEC/11 Dewhurst M-20 Key Switch (standard depth) The M-20 range of key switches is designed to meet the requirements of all lift applications. Dewhurst key switches are designed to complement our range of M-20 pushbuttons and indicators. The key switches are available in a wide range of options. These include stainless steel or brass front plate finishes and flat keys, triangular keys or radial (high security) keys. They are suitably rated to cater for typical applications in lift installations requiring key switch control such as fans, lighting and transfer of car operation controls. Features & Benefits Wide range front plate finishes Wide range of contact configurations Three key lock options (flat, radial & triangular as required by EN81-72 §5.8.1) Matching range of pushbuttons and hidden legends Studless mounting Can accommodate 1.0 mm to 3.0 mm faceplates Low profile range also available Surround options available to match pushbuttons or hidden legends Meets EN81-1/2, EN81-70, EN81-72 & EN60529 (IP54) Dewhurst UK Manufacturing Ltd - Unit 9, Hampton Business Park - Feltham - TW13 6DB - UK Tel: +44 (0)20 8744 8200 - Fax: +44 (0)20 8744 8299 - Email: [email protected] - www.dewhurst.co.uk This information is for guidance only and does not form the basis for contract - Dimensions in mm

M-20 Key Switch (Standard) Publication Number: PB3041 DEC/11 Finishes & Marking Wide range of front plate finishes - brush/mirrored stainless steel and brush/mirrored brass Brush finish front plates can be engraved or laser marked with text as an option Range of surround finishes - satin chrome*, mirrored chrome, brass and black Flat key lock is available in chrome or brass finish. All other locks are chrome finish * Standard with brush stainless steel front plate M-20 key switches can be supplied lose or incorporated into stations with 1.0mm to 2.5mm stainless steel faceplates. Recommended mounting...

M-20 Key Switch (Standard) Publication Number: PB3041 DEC/11 Movement Round key type & release Flat key type & release Contact options Standard Movement Spring Movement K or L or M or N only P or Q or R only S or U or W or X only Removable position Round (Deep/Standard Depth) Stainless Steel Key type & release option Select one of F1/ Select one of A-Y F2 or R1-R6 FR = FIREMANS using table below To order, combine the finish and the mechanical. For example, if you require a M-20 round deep keyswitch in brush stainless steel to go 0-90° with a flat key and contact A, the code is KM20RD BS F1 A....

M-20 Key Switch (Standard) Publication Number: PB3041 DEC/11 Cleaning your M-20 Key Switch Many Dewhurst lift products are made of polycarbonate (Using GE’s Lexan® or Bayer’s Makrolon®). The M-20 is highly durable and vandal resistant but the plastic parts can be damaged by aggressive cleaning agents, Dewhurst therefore recommends: Clean the part with a cotton cloth and warm water before applying the cleaning product Use PH-neutral or slightly acid cleaning products only (including aromatised ones) Ethylic alcohol, isopropyl alcohol or ethylene glycol based multipurpose cleaning products and...