Bosch Security Systems is redesigning its range of conventional smoke detectors from the 300 Series. With the operating voltage range of 8.5 to 30 V DC and the choice of different alarm resistances of 820 Ohms and 470 Ohms, the new series is compatible with Bosch as well as with third-party and OEM fire and intrusion panels. Also four-wire connection to panels and base sounder connection is suppor