Series 51 Versatile. Attractive and compact.

1 Series 51. Series 51. Versatile. Attractive and compact. 51 Information about the Series Key advantages Mounting cut-outs Compact construction mm Various configuration options mm Reliable and proven mm x mm Timeless and modern design mm x mm Raised or flush mounting Low back panel depth (Stop Switch) Terminal Typical application areas Soldering terminal Plug-in terminal Food and beverages Soldering/plug-in terminal Special vehicles PCB (with PCB plug-in base). Buildings services and automation Public transportation Lens Material Medical engineering Aluminium Functions Plastic Pushbutton Markings Illuminated pushbutton Mushroom-head pushbutton Engraving Selector switch Laser marking Keylock switch Hot stamping Indicator Film insert/marking plate Stop switch Pad printing Screen print Design Approvals Flush Raised CB (IEC 61058). CSA. IP front protection CQC.

2 ENEC (EN 61058). IP65 DNV GL (vormals Germanischer Lloyd). UL. Raitings Conformities 42 VAC (100 mA). 250 VAC (5 A) CE. 2014/30/EU (EMC). 2014/35/EU (LVD). 2011/65/EU (RoHS). 2006/42/EU (MD). 572 05/2020. Index 51. Flush design Pushbutton round 574. 01. Illuminated pushbutton square 577. Illuminated pushbutton rectangular 580 02. Illuminated pushbutton round 583. Selector switch 2 positions square 586 03. Selector switch 2 positions round 589. Keylock switch 2 positions square 592. 04. Keylock switch 2 positions rectangular 595. Keylock switch 2 positions round 598. Keylock switch 3 positions square 601 09. Keylock switch 3 positions rectangular 603. Keylock switch 3 positions round 605 14. Indicator square 607. Indicator rectangular 609 17. Indicator round 611. Raised design 18. Illuminated pushbutton square 613. Illuminated pushbutton rectangular 616.

3 Illuminated pushbutton round 619 19. Mushroom-head pushbutton 622. Selector switch 2 positions, round 624 22. Selector switch 3 positions, round 628. Keylock switch 2 positions square 630 31. Keylock switch 2 positions rectangular 633. Keylock switch 2 positions round 636. Keylock switch 3 positions square 639. 41. Keylock switch 3 positions rectangular 641. Keylock switch 3 positions round 643 45. Indicator square 645. Indicator rectangular 647 51. Indicator round 649. Stop switch 651. 56. Components 653. Accessories 662. Technical data 669. 57. Marking 674. Application guidelines 675 61. 70. 71. 82. 84. 92. 96. 05/2020 573. 51 Flush design Pushbutton round, IP65. 01. Equipment consisting of (schematic overview).. 4. 02 B. Lens Page 653. 44. 03 L A. C. Actuator 04. 2 .. 59 41 3. 09. Product can differ from the current configuration. Dimensions [mm].

4 A = Solder terminal Front bezel set Page 658. B = Plug-in terminal mm x mm 14 C = Universal terminal mm x mm Fixing nut 17 NJO . Each Part Number listed below includes all the 18. NJO . black components shown in the 3D-drawing. To obtain a complete unit, please select the red components from the pages shown. 19 .. 22. Mounting cut-outs [mm]. 31. 41. Actuator, Front dimension 25 mm Com- 45 Wiring ponent Switching action Contacts Terminal Switching system Part No. diagram Layout Momentary 1 NC / 1 NO Plug-in terminal Snap-action switching element 247 27. 51 1 NC / 1 NO Soldering terminal Snap-action switching element 247 27. 2 NC / 2 NO Soldering terminal Snap-action switching element 251 27. 3 NC / 3 NO Soldering terminal Snap-action switching element 253 27. 56 4 NC / 4 NO Soldering terminal Snap-action switching element 255 27. Maintained 1 NC / 1 NO Plug-in terminal Snap-action switching element 250 27.

5 1 NC / 1 NO Soldering terminal Snap-action switching element 250 27. 57 2 NC / 2 NO Soldering terminal Snap-action switching element 252 27. 3 NC / 3 NO Soldering terminal Snap-action switching element 254 27. 61 4 NC / 4 NO Soldering terminal Snap-action switching element 256 27. Momentary 2 NO Universal terminal Low-level element 245 27. 2 NC Universal terminal Low-level element 243 27. 70 1 NC / 1 NO Universal terminal Low-level element 239 27. 1 NO Universal terminal Low-level element 241 27. 1 NC Universal terminal Low-level element 237 27. 71 Maintained 2 NO Universal terminal Low-level element 246 27. 2 NC Universal terminal Low-level element 244 27. 82 1 NC / 1 NO Universal terminal Low-level element 240 27. 1 NO Universal terminal Low-level element 242 27. 1 NC Universal terminal Low-level element 238 27. 84 Contacts: NC = Normally closed, NO = Normally open 92.

6 96. 574 05/2020. Flush design 51. Wiring diagrams 01. 1 1 1 3 1 3 1 1 1 3. 02. 03. 2 2 2 4 2 4 2 2 2 4. 04. Wiring diagram 237 Wiring diagram 238 Wiring diagram 239 Wiring diagram 240 Wiring diagram 241 Wiring diagram 242 Wiring diagram 243. 09. 1 3 1 3 1 3 1 3 1 3 1 3 1 3. I I I II. 14. 2 4 2 4 2 4 2 4 2 4 2 4 2 4. 17. Wiring diagram 244 Wiring diagram 245 Wiring diagram 246 Wiring diagram 247 Wiring diagram 250 Wiring diagram 251 18. 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3. I II I II III I II III 19. 22. 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4. 31. Wiring diagram 252 Wiring diagram 253 Wiring diagram 254. 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3. 41. I II III IV I II III IV. 45. 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4. 51. Wiring diagram 255 Wiring diagram 256. 56. 57. 61. 70. 71. 82. 84. 92. 96. 05/2020 575. 51 Flush design Component layouts 01. 02 D. 03 18 mm 18 mm x 18 mm 18 mm x 24 mm (6x).

7 04 b 4 3. b b b A. 1 3. 2 4. 1 3. 2 4. 1 3. 2 4. C C. 2 1. 09. a a a a 14 b 2 3. b b b 1 3. 4 2. 1 3. 4 2. 1 3. 4 2. B C C. 4 1. a a a 17 a (6x). 18. Component layout 27. 19 Dimensions [mm]. A = Universal terminal (rear side). B = Plug-in terminal (rear side). C = Anti twist device 22 D = Drilling plan 31. 41. 45. 51. EAO Downloads. 56. 57 EAO creates possibilities. Since 1947. 61. 70. 71. On our website you can download technical data, assembly instructions, catalogs, brochures and much more. 82. 84. 92. 96. 576 05/2020. Flush design 51. Illuminated pushbutton square, IP65. 01. Equipment consisting of (schematic overview).. 4. B. 02. Lens Page 653 44. L A. 03. LED Page 660. C. 04. 2 .. 59 41 3. Actuator 09. Dimensions [mm] Product can differ from the current configuration. A = Solder terminal B = Plug-in terminal mm x mm C = Universal terminal mm x mm 14.

8 Front bezel set Page 658. NJO 17. 3 NBY . 18. NJO . Fixing nut .. Each Part Number listed below includes all the black components shown in the 3D-drawing.. 19.. To obtain a complete unit, please select the red components from the pages shown. 22. Mounting cut-outs [mm]. 31. 41. Actuator, Front dimension 24 mm x 24 mm Com- Wiring ponent 45. Switching action Contacts Terminal Switching system Part No. diagram Layout Momentary 1 NC / 1 NO Plug-in terminal Snap-action switching element 18 27. 1 NC / 1 NO Soldering terminal Snap-action switching element 18 27 51. 2 NC / 2 NO Soldering terminal Snap-action switching element 24 27. 3 NC / 3 NO Soldering terminal Snap-action switching element 26 27. 4 NC / 4 NO Soldering terminal Snap-action switching element 28 27 56. Maintained 1 NC / 1 NO Plug-in terminal Snap-action switching element 19 27. 1 NC / 1 NO Soldering terminal Snap-action switching element 19 27.

9 2 NC / 2 NO Soldering terminal Snap-action switching element 25 27. 57. 3 NC / 3 NO Soldering terminal Snap-action switching element 27 27. 4 NC / 4 NO Soldering terminal Snap-action switching element 29 27 61. Momentary 2 NO Universal terminal Low-level element 11 27. 2 NC Universal terminal Low-level element 30 27. 1 NC / 1 NO Universal terminal Low-level element 7 27 70. 1 NO Universal terminal Low-level element 9 27. 1 NC Universal terminal Low-level element 11 27. Maintained 2 NO Universal terminal Low-level element 12 27 71. 2 NC Universal terminal Low-level element 31 27. 1 NC / 1 NO Universal terminal Low-level element 8 27. 82. 1 NO Universal terminal Low-level element 10 27. 1 NC Universal terminal Low-level element 6 27. Contacts: NC = Normally closed, NO = Normally open 84. 92. 96. 05/2020 577. 51 Flush design Wiring diagrams 01.

10 1 b+ 1 3 b+ 1 3 b+ 1 b+ 1 b+ 1 3 b+. 02. 03. 2 a- 2 4 a- 2 4 a- 2 a- 2 a- 2 4 a- 04. Wiring diagram 6 Wiring diagram 7 Wiring diagram 8 Wiring diagram 9 Wiring diagram 10 Wiring diagram 11. 09. 1 3 b+ 1 3 b+ 1 3 x2+ 1 3 1 3 x2+. I I I II. 14. 17 2 4 a- 2 4 a- 2 4 x1- 2 4 2 4 x1- 18 Wiring diagram 12 Wiring diagram 18 Wiring diagram 19 Wiring diagram 24. 1 3 1 3 1 3 x2+ 1 3 1 3 1 3 x2+. 19 I II III I II III. 22. 2 4 2 4 2 4 x1- 2 4 2 4 2 4 x1- 31. Wiring diagram 26 Wiring diagram 27. 41 1 3 1 3 1 3 1 3 x2+ 1 3 1 3 1 3 1 3 x2+. I II III IV I II III IV. 45. 2 4 2 4 2 4 2 4 x1- 2 4 2 4 2 4 2 4 x1- 51. Wiring diagram 28 Wiring diagram 29. 56. 1 3 b+ 1 3 b+ 1 3 1 3. 57 I II. 61. 2 4 a- 2 4 a- 2 4 2 4. 70. Wiring diagram 30 Wiring diagram 31 Wiring diagram 252. 71. 82. 84. 92. 96. 578 05/2020. Flush design 51. Component layouts 01. D. 02. 18 mm 18 mm x 18 mm 18 mm x 24 mm 03.