4550 series numeric calendar clocks
- order specification codes
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order code example
4550E.100.B.S.UK.Silver
    |    |     |   |   |     |       |
   A   B   C  D  E   F     G
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

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4550 series with 57 or 100mm high characters - order specification codes

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 .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