Key Switches Types US89, US90 and US91 with surround

Publication Number PB173/0606Application Dewhurst key switches are designed to complement our range of pushbuttons and indicators and are available in a widerange of options such as plastic or stainless steel finishes, illumination and flat keys or round (high security) keys. They aresuitably rated to cater for typical applications in lift installations requiring key switch control such as fans, lighting and transfer of car operation controls. Operation All Key Switches, except spring return, are supplied for the key to remain set at 90º positions. Key removable and trappedpositions are indicated overleaf. Construction A lock barrel, with either a standard flat key or high security round key, or fireman triangular lock to meet EN81-72 (§5.8.1)is fixed into the swich body assembly which has stainless steel, brass or red or black plastic front finishes. The switch body is then securely fixed to a faceplate. The switch body carrying the contact blocks is designed so that any loads are notborne by the contacts. Technical Weight103gms (max)Moulded in:High grade polycarbonateEnvironmental protection:IP44 (frontal presentation)Metal front:Brushed stainless steel (standard), mirrored stainless steel, brass & mirrored brass (optional)Approved to:UL, CSA, LUL Conforms to:BSEN60947-3, IEC 60947-3, VDE 0660 Part 107 Rating 5A@240V a.c.15, 6.0A@110V d.c., 20A@24V d.c.Maximum wire gauge per terminal is 2 x 2.5mm².The Key Switches can be supplied loose, or incorporated into stations with 1.5mm, 2.5mm stainless steel or 3mm brassfaceplates with a vertical pitch of 50mm and horizontal pitch of 60mm. Spacers are provided to enable flush mounting. Marking Functions and designations can be marked on the faceplate.
US89US90US91Flat KeyBarrelRound KeyBarrel 59.150.80 59.150.80 59.150.80 45 45 45 2.3 4.4‘X’ 4.4‘X’ CONTACT ARRANGEMENT A, D, G, H, K, L, P, Q, U, RB, C, E, F, I, J, M, N, S, T, W YX V 5.6 Fireman’s (FR)Available in all shapes (US89/90/91) LED halo illumination (red) (flat key only) LED: DIM ‘X’ Voltage24V d.c. ±20%Current20mAWire colours+V (red)-V (black)Cable length100mm 41.60 49.90 59.20 68.50 This information is for guidance only and is not intended to form the basis for contract. All dimensions in mm. Dewhurst manufacturers of plc tel +44 (0)20 8607 7300 fax +44 (0)20 8572 5986 info@dewhurst.co.uk www.dewhurst.co.uk