Lathem Sonachron Replacement Bell System Kit
Programmable work shift timer and bell system
Description
This Lathem Sonachron replacement kit is designed to replace older bell systems with a modern, reliable controller. The system uses the a modern, USA-designed and assembled controller to automate shift changes, breaks, lunches, and scheduled alerts using a connected 110V bell.
Programming is done directly at the controller, allowing fully stand-alone operation with no software or network connection. Once programmed, the system activates the bell automatically according to the stored schedule.
System Features
- Direct replacement for Lathem Sonachron bell timers
- Programmable daily schedules with multiple events
- Up to 50 events per day, shared across 7 days:
More than enough ring events for three shifts, plus dedicated ring times for weekends!
- Automatic Daylight Saving Time adjustment
- Maintains programming through power outages, and restores to the correct time.
- Adjustable signal duration for warnings or shift changes
Included Components
| Controller |
Master Clock Timer |
| Bell Output |
Internal 110VAC relay |
| Bell |
High-volume 110V fire bell |
| Power & Wiring |
Power supply and bell wire included |
Expandability
The system can be expanded to support additional bells and/or buzzers without replacing the main controller. This makes it ideal for facilities with multiple rooms, planning future growth, or multi-area signaling.
FAQ
Is this a direct replacement for a Sonachron system?
Yes. It is commonly used when Sonachron timers fail or replacement parts are no longer available.
It does not control digital or analog wall clocks. Just bells, buzzers, and strobe lights.
Can additional bells be added?
Yes. Multiple bells or buzzers can be connected using proper wiring.
Does it keep time during power loss?
Yes. Programming is retained and correct time is restored when power returns.
Related Items
- 6-Inch 110V AC Bell
- Industrial Vibrating Buzzer (110V)
- 92 to 105db 110V Bells (6"bells are LOUDER than 8" bells)
- Bell Wire (25 ft / 50 ft / 100 ft / 250 ft)<
What’s Included
- Modern USA-designed master clock terminal with owner’s manual
Note: Manual is written in USA, and is available only in english.
- Power supply
- Internal 110V, 10-amp mechanical relay (pre-wired and tested)
- 10-amp rated grounded 110V power cord
- 10 ft bell wire cable (extend as needed)
- Loud red 110V fire bell (expandable)
The schedule timer can control:
- Up to 8 standard 110VAC bells (expandable with optional power booster)
- Up to 6 loud 110V buzzers (expandable with optional power booster)
Optional Upgrade:
Strobe lights can be added, they would flash at the same times as the bells.
ETC Installation Experience:
We have installed over 800 master timer bell and clock systems (as of August 2026).
Work with this equipment in the field, solve real installation problems, and support systems long after installation.
This hands-on experience is rare in this industry. If you have questions, call us. We know this system inside and out. All our timers are designed, built, and supported in USA.