New System Sensor SS-Series detectors

I should mention that there is no evidence of the i3/i4 series actually being discontinued at this point. However, the potential applications are extremely limited (e.g. device replacements, if those are even permitted).

The individual sounder would activate when the detector goes into alarm and all sounders would activate if the NAC’s polarity is reversed. The conventional B401BH(-2) and the addressable B501BH(T)(-2) and B200SR(-LF) all work this way, and the i3 sounder models are similar except combining the NAC and detector power into one circuit that can enter reverse polarity with an RRS-MOD. There was some speculation about low frequency i3/i4 sounders back in 2014 but these were never produced.