The DELTA reflex battery (Article no. 752 079) of the smoke detector can be in addition equipped with a relay module. The relay module allows switching on of alarm devices like Horns, sirens, warning lights, etc., or a connection to the building automation system GAMMA instabus. Even the standby current (alarm loop with normally closed contact) can be monitored due to the potential free changeover contact (NC & NO). The contacts of the relays are implemented via a 3-way plug terminal. The power (3 to 5 V) is supplied to the relay module via the port of the smoke detector.