Simplex Replacement System Clocks & Upgrade Solutions
Replace legacy Simplex synchronized clocks without a full system tear-out. Upgrade clocks, controllers, or transition to hybrid wired/wireless on your terms.
No Full System Replacement Required
Upgrading an aging Simplex clock system doesn’t require ripping out your existing infrastructure. American Time’s AllSync Plus® clocks are designed to integrate with existing Simplex wiring and correction signals, allowing you to replace clocks individually as they fail, or upgrade in phases as budgets allow.
- Reuse existing wiring (120VAC or 24VAC)
- Minimal downtime with Molex® plug-and-play connections
- Compatible with legacy Simplex correction protocols
- Ideal for schools, hospitals, and commercial facilities
Identify Your Simplex Clock Model
Determine what Simplex Series you have
In older models, your clock may only have four numbers. Once you’ve identified your clock model, try our Replacement Clock Finder or call 800.328.8996 for model number assistance.
For eight-digit models, the two digits after the dash are most important when finding your replacement clock because they denote the movement type:
- 9000 Series: Impulse
- 9100 Series: Electronic Frequency
- 9200 Series: 3-Wire Synchronous
- 9300 Series: Stand-Alone Electric
- 9400 Series: Stand-Alone Battery
The third digit after the dash describes the size, shape and mounting. The remaining digit(s) will vary by system type.


Repair vs. Replace your Simplex Clock or System
Upgrade Your Simplex Cocks System Instead
–9100 Series: Electronic Frequency clocks can no longer be replaced by a direct comparison. If you aren’t looking to change your system, WI-FI CLOCKS have become a flexible alternative that can sit alongside your other synchronous clocks and keep accurate time.
–9300 or –9400 Series: Stand-Alone Battery or Electric clocks are non-synchronous. See our STAND ALONE WALL CLOCKS page for a range of clocks that can be manually set, radio-controlled and/or set with an automatic daylight saving time feature.
Not sure which series you have? Use the Replacement Clock Finder or call 800.328.8996
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Legacy Simplex Clocks 39515_6f7fc0-c6> |
AllSync Plus® Replacement 39515_64ec4d-e6> |
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Aging mechanical parts 39515_205cac-f9> |
Modern solid-state movement 39515_34cf32-ad> |
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Increasing maintenance 39515_6fa339-35> |
Lower lifetime cost 39515_ba3a42-00> |
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Limited parts availability 39515_a6700b-35> |
Current production, in stock 39515_36bb48-23> |
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Manual resets 39515_3a4ce5-c2> |
Automatic correction 39515_a0e464-c5> |
AllSync Plus® Clocks for Simplex Systems

The 3-wire movement (9200 Series) is the most common type used with Simplex synchronous clocks and is compatible with ALLSYNC PLUS technology. AllSync Plus clocks are available in 120VAC and 24VAC, so be sure to select the correct voltage for your replacement clock.
Precision, Energy Efficiency and Flexibility with Lifetime Technical Support
AllSync Plus clocks are available in many more styles than their counterparts. When replacing Simplex 9200 Series clocks, the choice of case material and style is up to you!
- Accurate to within one second of the system controller
- Solid-state movement (no gears, no mechanical wear)
- 15 minutes of reserve operation during power outages
- Plug-and-play Molex® connection
- 3-year warranty with lifetime technical support


Update Your System Controller
When all of your clocks are off-time, your controller may be to blame. Replace an existing Simplex time programmer with the AllSync IQ system controller to keep your system running. AllSync IQ can replace these Simplex programmers.
| Simplex 2350 Master Time System | Simplex 2351 Master Clock | Simplex 2400 Energy Management System | Simplex 6100 Program/Timer | Simplex 6400 Time Control Center | Simplex 6351 Time Control Center |
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Update to AllSync IQ
If you’re struggling with an outdated Simplex time controller, contact us to find out how easy it can be to replace it with AllSync IQ. This scheduling device provides synchronized control of wired secondary clocks, bells and other electrical circuits. Programming is fast and easy using the Remote Connect web interface or keypad.
- Control up to 99 schedules and 9999 events
- Automatic adjustments for daylight saving time and leap year
- Six signal circuits and two clock circuits
- Surge protection
- 5-Year warranty

Repair Your Existing Clocks with a Replacement Movement Kit for Simplex Clocks
Perfect for the DIY expert, this AllSync Plus kit has everything you need to replace the mechanical movement on your Simplex brand clock! Watch our easy-to-follow video to walk you through each step, or download the instructions to get your old Simplex clocks ticking again!
Replacements for Simplex Impulse Clocks
Impulse clocks are distinguishable by not operating a sweep hand. Maintain your existing clock system with direct replacements for Simplex 2310-9000 and 6310-9000 Series impulse clocks.

Select the correct type.
Impulse clocks come in 2- and 3-wire models and with hourly only or hourly and 12-hour correction.
Look for the two-letter code in the model number when selecting a replacement clock for your Simplex system:
[FF] 2-wire, hourly correction
[FG] 2-wire, hourly and 12-hour correction
[JF] 3-wire, hourly correction
[JG] 3-wire, hourly and 12-hour correction


Upgrade your wired system today.
Transition to wireless for tomorrow.
You may just need a replacement clock or some repair kits to keep your wired system running today. But, there is another way.
By switching to a hybrid wired/wireless controller, you can prepare for tomorrow. WIRELESS SYSTEMS give you the flexibility to add any number of clocks. Hang them wherever you need them without the expense of wiring another circuit.
Need advice? Talk to an expert.
From maintaining to upgrading, we can help you through each consideration.
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