The DIN-Rail Switch Monitor Plus is designed to monitor the state of one or more single pole, volt-free contacts connected on a single pair of cables and to report the status to Apollo compatible analogue addressable control equipment.

• Output for resetting a remote detector
• Four input states - 'normal', 'fault', 'pre-alarm' and 'alarm'
• Two visible LEDs
• Loop-powered
• Selectable alarm delay for monitoring flow switches