DTA工型矿用电话机是矿用本安型电子电话机,适于煤矿井下使用。通过HAT1型矿用电话耦合器实行安全隔离后,能接入供电电压不大于直流60V的各种交换机。DTA1型矿用电话机分为共电式和自动式两种,结构基本相同。共电式电话机设有发送、接收两只放大器,不用拨号盘,而用一防尘罩占位。自动式电话机还加有紧急呼叫单元,功能齐全,电子电路采用胶封结 DTA type mining telephone is mine intrinsically safe electronic telephone, suitable for underground coal use. HAT1 mine telephone coupler through the implementation of safe isolation, access to the supply voltage is not greater than 60V DC switch. DTA1 mine telephone is divided into two types of electric and automatic, the structure is basically the same. Co-electric phone with send and receive two amplifiers, without a dial, but with a dust cover placeholder. Automatic telephone also has an emergency call unit, full-featured, electronic circuits using plastic sealing knot