If you plan on using a Lathem Time Clock(PC600, PC700, CT70, CT72, CT74, or future models) to ring bells, it will require the use of the SR501-4 Relay Booster, which replaces the RB8 Relay Booster.
The SR501-4 Relay Booster can be ordered via the Amazon link below:
Order the SR501-4 Relay Booster
Installation guide for the SR501-4 Relay Booster available for download via the link below:
SR501-4 Relay Booster Installation Guide
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