Simplex Replacement System Clocks & Upgrade Solutions

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.

3-Wire Movement (9200 SERIES)
Impulse Movement (9000 SERIES)

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

Legacy Simplex Clocks

AllSync Plus® Replacement

Aging mechanical parts

Modern solid-state movement

Increasing maintenance

Lower lifetime cost

Limited parts availability

Current production, in stock

Manual resets

Automatic correction

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
Simplex 2350 Master Time SystemSimplex 2351 Master ClockSimplex 2400 Energy Management SystemSimplex 6100 Program TimerSimplex 6400 Time Control CenterSimplex 6351 Time Control Center

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
AllSync IQ system controller

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!

ASKIT02 for Simplex Clocks
  • I have not found customer care and service like this beyond the confines of our own company.

    I appreciate American Time’s customer care, fast response times and most of all its employees. I look forward to working with you and the rest of the team in the near future.”
    Daniel D.
    – Vice President of Sales

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.

picture showing 2-wire impulse clock movement on back of clock

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




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