Compatibility module SM1 is used when two-wire fire detectors must be wired to the security control panels that use a four-wire fire detector wiring diagram. The module is wired between the inputs (zones) of the control panel and two-wire fire detectors.
| Input voltage | from 10,5 V to 15 V |
| Output relay | NC/NO/C |
| Triggering current (when relay changes status) | over 15 mA |
| Mutual idle current of detectors and the additional relay | up to 10 mA |
| Triggering current | over 15 mA |
| Measurements | 4 x 21 x 19 mm |
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