Wharton 4550 calendar clock range with numeric day and date with 57mm (2.3") or 100mm (4") digits

4550 calendar clock with blue  or yellow digits

4550x.057.B.S & 4550x.057.Y.S with European date format  

4550 calendar clocks with green or red digits

4551x.057.G.S & 4551x.057.R.S with US date format  

 57mm digits - 25m (75ft)  more
 100mm digits - 50m (150ft)

  • Our 4550 range of numeric time and date calendar clocks show the date as a numeric value in either European (4550) or US (4551) formats with an hours, minutes and seconds time display.
  • The range has a 12 or 24-hour time and numeric date display using two rows of 57mm (2.3") or 100mm (4") ultra-reliable blue, green, red or yellow/amber LED digits.
  • An RC100 handset is provided for remote time-setting, stopwatch control, operating mode and special function selection.

Wharton numeric date clocks have many user-selected modes of operation:

  • E and NE versions can be used in stand-alone applications using their internal time references.
  • The clock has rear connections to enable time synchronisation using one of a wide selection of time code protocols from a Wharton 5000 series master clock or suitable third party time reference.
  • You can synchronise individual calendar clocks with a satellite-based atomic time reference via a control message from a Wharton 488HS series GPS or GLONASS time signal receiver.
  • N and NE versions can be controlled and synchronised to time via their 10/100Base-t Ethernet NTP connection to your existing network with accurate time information provided by a local or internet time server for simple, low-cost installation and control.

Stopwatch operation

  • Wharton 4000 series time and date clocks have time digits freely switchable between the display of time-of-day and multifunction stopwatch or countdown time.
  • The standard RC100 IR handset controls the stopwatch and countdown timer functions.
  • You can also control the stopwatch functions of E and NE versions with an optional 496E dedicated switch panel or by external user-supplied voltage free contacts.
  • Multiple N or NE versions of 4000 series clocks may be operated in Network Stopwatch Mode to provide a remote readout of stopwatch or timer counts.
496E stopwatch control panel

496E switch panel - features:

  • 1G plate size 86mm x 86mm with IP65 rated sealed switches.
  • We supply the 496E panel with a 5m three core captive cable interconnection to the clock. You can extend the interconnection distance up to 20m using a 7/0.2 (0.22mm2) screened cable. Please contact technical support for longer interconnection distances.
  • Please note that you must use either the RC100 infrared remote control or the rear-mounted clock setting switches for setting the clock time and date or the clock and stopwatch operating modes. You cannot use the 496E panel for time, date and function setting.

User-programmable stopwatch and countdown timer function

  • The following stopwatch and countdown timer functions are user programmable:
    • Stopwatch display modes
    • Stopwatch display resolution
    • Stopwatch count direction
    • Stop/start and hold switch actions
    • Countdown start count
    • Using external, voltage free, switch contacts - E and NE versions only
  • For further information about stopwatch & countdown timer operation


  • The high-quality clock enclosures have a black, silver or special order finish. Case type and colour information.
  • The standard model is suitable for freestanding or wall mounting using the multi-angled brackets supplied. Mounting options include cases for flush wall mounting and single or double-sided clocks with mounting supports for ceiling suspension.
  • 110-230V AC, 24 or 48V DC or PoE (Power over Ethernet) power supply options.
  • All Wharton day-date products are designed, manufactured and tested to International Quality and Performance Standards.
  • Unrivalled free product lifetime technical support with unlimited advice and information to the original user for the life of the digital clock. Many previous models are still in service more than 15 years after first supply.
model size - w x h x d weight
4550x.057 450 x 240 x 58mm  17.7" x 9.5" x 2.3" 4kg  - 9lb
4551x.057 450 x 240 x 58mm  17.7" x 9.5" x 2.3" 4kg  - 9lb
4550x.100 800 x 420 x 66mm  31.5" x 16.5" x 2.6" 8.5kg  19lb
4551x.100 800 x 420 x 66mm  31.5" x 16.5" x 2.6" 8.5kg  19lb
sizes and weights are for .S. single sided wall mounted clocks
order code example

A - model (Day of week, day of month, month and hours, minutes and seconds): 4550
B - version (non-network): E
C - display height (100mm): .100
D - display colour (blue): B
E - case style (surface) : .S
F - power supply (UK): .UK
G - case colour (silver): .Silver
A - model code
Day, month, year date display 4550
Month, day, year date display 4551
B - version  
non-network version with enhanced features E
network version N
network + enhanced features NE
C - display height  
57mm (2.3") .057
100mm (4") .100
D - display colour  
blue - please note that blue illuminated characters can appear slightly out of focus to some people due to variations in the response of the human eye to blue light and typically have a shorter practical viewing distance than red, green or yellow characters. .B
green .G
red .R
yellow .Y
E - case style  
surface mounting case for wall mounting .S
flush mounting case for use in a panel with rear access .FP
flush mounting case supplied with mounting box .FB
single sided ceiling suspended case .SS
double-sided ceiling suspended case .DS
F - Power supply  
internal PSU 110-240vac 50/60Hz (standard)  
with Australian mains lead .AU
with EU mains lead .EU
with UK mains lead .UK
with US mains lead .US
24v DC power supply .24vdc
48v DC power supply .48vdc
IEEE 802.3af-2003 Class 3 .POE
G - case colour  
black .black
silver .silver
RAL or other standard case finish .RAL9010