| MODEL NO. | DESCRIPTION |
| FZB01 | Connects to 2-wire detection circuit via screw terminals. |
| FZB01U-TX | Same as above plus provision for remote LED indicator and remote functional test |
| FZB01U-SX | Connects to 2-wire detection circuit via pigtail leads. |
| FZB01U-4S | Connects to 4-wire detection circuit via pigtail leads. |
| FRL01U | 2-wire relay module component of FZB01U-SX above. |
| FRL01U-4 | 4-wire relay module component of FZB01U-4SX above. |
| FTZ01 | Sensitivity Tester for local functional test.
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