I need a wiring diagram for a three phase paragon timer model number 8145-20.

Copy following link to identify defrost timer.
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost
Add a comment and say which defrost timer you have, which voltage and phase the incoming line

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10-19-12
Each timer has a contactor.
Timers can also control a contactor.
Which timer do you have?

Here are contactors, with some illustrations showing tiimers controlling contactor:
http://waterheatertimer.org/H230A.html

Here are example timers controlling a 3-pole contactor for 3-phase application:
http://waterheatertimer.org/How-to-install-3-phase-timer.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) If circuit breaker is not tripped or shorted, then timer clock motor has probably gone bad.

2) Some places still sell paragon timers, depending on model number.
But model number given is for 240Volt timer.

3) The clock motor is not available that I can find.
Paragon is no longer making the 4000 series timers or parts
http://waterheatertimer.org/Paragon-timers-and-manuals.html#4000

4) Model number given does not match wiring terminals shown in manual.
4014 is DPST 240Volt timer with 4 wiring terminals labeled 1 2 3 4.
http://waterheatertimer.org/pdf/Paragon-4000-series.pdf

5) Paragon 4000 series timer with terminals 1 2 3 is 120Volt timer.

6) Replace 120Volt timer with Intermatic T101 indoor timer or T101R outdoor timer.
Crossover wiring:
Paragon terminal 1 goes to Intermatic terminal 1
Paragon terminal 2 goes to Intermatic terminal 2
Paragon terminals 3 goes to Intermatic terminal A
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101

7) Take a moment and rate answer:
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5x455 is WW Grainger number for 240Volt time initiated - time terminated Paragon 8045-20 timer.
Open following links to identify timer and download wiring diagram:

http://www.grainger.com/Grainger/PARAGON-Time-InitiatedTime-Terminated-Defrost-5X454?Pid=search
http://waterheatertimer.org/Paragon-timers-and-manuals.html#8045

Google search for X2772 tripper and some places may still have them.

Paragon is no longer making timers and parts except defrost timers.
Paragon 4001-00 120Volt timer uses X2772 tripper:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#4000

Paragon 4001-00 crossover to Intermatic is T101 120Volt timer.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101

Crossover wiring:
Paragon 4001-00 has terminals 1 2 3
T101 has terminals A 1 2

Paragon terminal 1 connects to Intermatic terminal 1
Paragon terminal 2 connects to Intermatic terminal 2
Paragon terminal 3 connects to Intermatic terminal A

8145-20 240Volt Paragon timer is not 3-phase.
Clock motor is 240V.
You need a transformer to convert 3-phase to single phase 240V to operate timer.
Then timer outputs can control 3-phase power using 3-phase contactors
Contactor below is 3 phase with 240V coil
http://www.grainger.com/Grainger/DAYTON-Contactor-2UTP7?Pid=search

Defrost timer wiring diagrams show below:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

Paragon 7000
Paragon 7005 is a heavy duty 7-day mechanical timer that can handle 4 loads. It is DPST. One of two wiring diagrams applies to this timer:
The question is the the timer clock motor is 120V or 240V?

Paragon EC 7000 is a 7-day digital timer with 16 set points per week
Manual for EC7000
http://waterheatertimer.org/pdf/Paragon-EC7000-wire.pdf

Please re-post your questions as you start sorting out which timer you have.
Paragon is improving their site so there is less confusion over model numbers and functions. but information about the 7000 are still sketchy.

http://waterheatertimer.org/Paragon-timers-and-manuals.html

I don't find the Paragon 4004-20 listed in manual.
4004-71 is shown, and uses wiring diagram 3
4004-71B, M, S use wiring diagram 4
4004-06 uses wiring diagram 7
Your timer sounds like a 240V DPST
http://waterheatertimer.org/pdf/Paragon-4000-24hr-7000-7day.pdf

Manual shows wiring diagrams, depending on how many screw terminals and loads you have, and voltage of clock motor and voltage of load.

Link below has wiring diagrams for 4001-00 timers:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#4000

Manual with wiring diagram:
http://waterheatertimer.org/pdf/Paragon-4000-24hr-7000-7day.pdf

4001-00 is wiring diagram #1
There are 3 terminals 1 2 3
Black Hot wire from circuit breaker goes to terminal 1
Black wire to Load (light, fan, motor) goes to terminal 2
Whites wires connect to terminal 3

You need someone to come in and trace the wiring if you cannot figure it out. You said you had the Paragon wiring diagram already, if not the link below can be used.

http://www.uni-line.com/images/docs/refrigeration-8140series-wiring.jpg

This defrost time can be used for both hot gas and electric heater defrosting so check to see which defrost type is being used.