Lathem Sonachron Replacement Bell System Kit
Programmable work shift timer and bell system built around the Pyramid 7000 master clock.
Description
This Lathem Sonachron replacement kit is designed to replace older Sonachron DWA-S bell systems with a modern, reliable controller. The system uses the SSPT724A 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
- Automatic Daylight Saving Time adjustment
- Maintains programming through power outages
- Adjustable signal duration for warnings or shift changes
Included Components
| Controller |
SSPT724A |
| 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 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.
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)
- Bell Wire (25 ft / 50 ft / 100 ft / 250 ft)
What’s Included
- SSPT724A master clock terminal with owner’s manual
- 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 power booster)
- Up to 6 loud 110V buzzers (expandable with power booster)
Optional Upgrades
- Strobe light activation with bell/buzzer events
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.