BOSCH F220-B6E

The F220‐B6 Detector Bases work with the F220 Photoelectric Smoke and Heat Detectors. The F220‐B6 is a 12 V or 24 V base for two‐wire loops. The other bases in this family are 12 V or 24 V bases for four‐wire loops.
Base, end-of-line relay, 4-wire 12/24V.
Four‐wire base with a normally‐open (NO) alarm relay and an EOL power supervision relay. The base works with the F220 smoke detectors and heat detectors.