Manual Switches MML21 Series Electronic Control Pushbutton LED, INCANDESCENT, OR NON-LIGHTED DISPLAY FEATURES Example: MML21KK3AAK 1 Silver or gold contacts Electronic control pushbutton switch with 1 Choice of rectangular or square standard plunger rectangular housing housings (black) bezel (black) mounting clips on 1 Accepts one LED or incandescent long sides, PWB terminals 1-pole, mo- PWB Mount Panel Mount lamp mentary action, silver contacts, black (Standard plunger) (Standard plunger) 1 Printed wiring board or snap-in panel plunger. mounting 1 Bezels and mounting clips, LEDs and Example: MML21KK3AAKRSDR legended lenses can be furnished As above, except furnished with red LED installed or ordered separately and red lens installed. 1 UL recognized, CSA certified MML21KK3AAHRSXX20 as above, leg- ended. PWB Mount (One-piece plunger) Catalog listing codes for switch, less assembled display options MML21 STANDARD PLUNGER SWITCHES ORDER GUIDE MML21K K 3 AA Housing Type Mounting Terminals Circuitry/Action (Each pole is double throw) Rectangular Square Rectangular Square MML21K A No bezel (PWB A No bezel (PWB 3 Printed Silver Contacts: Silver contacts: Rectangular Black Housing mounting) mounting) Wiring AA 1 pole, AA 1-pole, MML21H K Black bezel, mtg. R Black bezel Board mom. action mom. action Square Black Housing clip/long sides & mtg. clip 2 Solder AB 1 pole, AB 1-pole, alt. action alt. action AC 2 pole, mom. action AD 2 pole, alt. action Gold Contacts: Gold contacts BA 1 pole, BA 1-pole, mom. action mom. action BB 1 pole, BB 1-pole, alt. action alt. action BC 2 pole, mom. action BD 2 pole, alt. action MML21 ONE PIECE LENS/PLUNGER SWITCHES ORDER GUIDE Catalog listing codes for switch, less assembled display options MML21H K 3 AA Housing Type Mounting Terminals Circuitry/Action (Each pole is double throw) Rectangular Square Rectangular Square MML21K A No bezel (PWB A No bezel (PWB 3 Printed Silver Contacts: Silver contacts: Rectangular Black Housing mounting) Mounting) Wiring AA 1 pole, AA 1-pole, MML21H K Black bezel, mtg. R Black bezel Board mom. action mom. action Square Black Housing clip/long sides & mtg. clip 2 Solder AB 1 pole, AB 1-pole, alt. action alt. action AC 2 pole, mom. action AD 2 pole, alt. action Gold Contacts: Gold contacts BA 1 pole, BA 1-pole, mom. action mom. action BB 1 pole, BB 1-pole, alt. action alt. action BC 2 pole, mom. action BD 2 pole, alt. action 72 Honeywell1 Sensing and Control1 1-800-537-6945 USA1 F1-815-235-6847 International 1 1-800-737-3360 CanadaManuals Manual Switches MML21 Series Electronic Control Pushbutton Switches Electrical Data page 69 Bezels page 84 Strip and matrix mounting page 83 PWB pin locations page 91 3 Order display options assembled to switch by adding codes below K RS DR Plunger Type LED* Lens Legend 4 K Black XX No Led XX No Lens 20 5 RS Red With Legend (Leave W White 5 YS Yellow For LED Display For Incandescent Blank if no legend 5 GS Green DR Red or Unlighted Display needed DY Yellow LR Red Use Legend Order Sheet DG Green LY Yellow FO-74024 to cover each LG Green catalog listing. (See page LW White 80.) LK Black CUSTOMER INSTALLATION: LED 1. Order LED and receptacle, page 84. 2. Installation instructions, page 85/87. Incandescent Lamp 1. Order lamp/PWB receptacle or lamp/solder receptacle, page 86. 2. Installation instructions, page 87. Order display options assembled to switch by adding codes below H RS Button Color (One Piece Plunger) LED* Legend 4 For LED Display For Incandescent or non-light display XX No LED XX20 5 H Red R Red RS Red With Legend (Leave Blank if no 5 L Yellow Y Yellow YS Yellow legend needed 5 N Green G Green GS Green Use Legend Order Sheet FO-74024 to Z Black cover each catalog listing. (See page 81.) *Notes: 1. When an LED is specified in a rectangular MML21 listing, MICRO SWITCH will permanently install it in the housing. 2. MICRO SWITCH does not permanently install an LED in a square MML21 listing. To install an LED in a square housing, order a MML93L or MML93G receptacle and a MML92 LED (see pages 86 and 88). 3. Include four digits (XXXX or XX DR) when a legend is required. 4. For square or rectangular only. 5. For rectangular only. Honeywell1 Sensing and Control1 1-800-537-6945 USA1 F1-815-235-6847 International 1 1-800-737-3360 Canada 73