Nippon Hakuyo Electronics NHE-Oki 3308-OKB Addressable Type Analog Fixed Temperature Heat Detector NDC Nippon Dry-Chemical 3308-OKB is a low profile analog heat detector with 3312-OKB detector base. 3308-OKB rated voltage/current DC28V / 4.3mA. Quiescent current 0.3mA and operation voltage range: 12V-30V.