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Timeswitches
Mini-Programmers
Two-Channel Programmers, with common time base
Two-Channel Programmers, with independent time bases
Commercial Time Controls
  Product Range Description
  811
  841
  842
  851
  852

851



- 7 day operation
- 200 event memory
- Key protection
- Battery back-up
- Extend or crop overrides
- Volt-free contacts


The 851 is one of the models within the MK8 range of 7 day commercial and industrial controls. This range includes on/off units for boiler, lighting and process control, and pulsed output units for bellringing or siren sounding applications.

Programme entry is via a membrane keypad with audible feedback. For security it is only possible to enter or change the time, programme and extend duration with the removable key in place and turned to the setting position.

The on/off units 811, 851 and 852 feature a programmable 0 to 8 hour EXTEND or continuous override and a CROP override to Cancel the Remainder of an ON Period. The AUTO/OFF rocker switches allow outputs to be switched off.
851

Technical data



Code No.TypeDescriptionDimensions
(mm)

851
087N657200 851Single channel, 7 day, electronic timeswitch. Single channel. Up to 200 on /off outputs per week. Plus EXTEND override and CROP override.115 wide x 228 high x 50 deep


Documentation



Certificates/Declarations

MK8 Declaration of Conformity
Download
Literature number: VCAFI212 Release date: 02/11/2007
Filename: DRL0047 Mk8 Range 11-07.pdf Size:  0.0 Mb
Language: UK English
Instructions

811 and 851 Installation Instructions
Download
Literature number: VIAFW112 Release date: 01/12/2005
Filename: 3046.pdf Size:  0.5 Mb
Language: UK English
811 and 851 User Instructions
Download
Literature number: VIAFX112 Release date: 01/12/2005
Filename: 3044.pdf Size:  0.4 Mb
Language: UK English
Sales Leaflet

MK 8 Range
Download
Literature number: VBAFD112 Release date: 01/02/2006
Filename: 606.pdf Size:  0.3 Mb
Language: UK English
Wiring Diagrams

851 Wiring Diagram
Download
Literature number: VWAFJ112 Release date: 07/02/2007
Filename: 851.pdf Size:  0.4 Mb
Language: UK English