GAI-Tronics 352-001 UL Class I Division 1 Telephones - Manual (Page 6)

Pub. 42004-454A
Model 352-001, 352-002, 352-003, and 352-004 Division 1 Telephones Page: 6 of 13
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Internal
With the exception of the ring relay (when fitted), all standard components are mounted to the rear of the
front cover. See Figure 6 for the parts layout.
Figure 6. Model 352 Series Division 1 Hazardous Area Telephone - Internal View
Ring Relay PCBA
The Ring Relay PCBA allows the telephone to activate an external beacon or sounder when the telephone
receives a call. When installed, the Ring Relay PCBA is connected to the main PCBA via a USOC
RJ11C modular connector cord. This allows the telephone input wiring to be connected directly to the
Ring Relay PCBA. The Ring Relay PCBA is located in the rear enclosure. See Figure 6 for mounting,
and steps 3 through 5 in the “Wiring” section.