它由自耦变压器、数字逻辑电路和低压小继电器电路组成。
This device consists of self-coupling transfer, digital logic circuit and low voltage relay circuit.
通过对静态继电器整定用数字拨盘开关接点转换示意图和易发生的故障介绍，初步探讨了静态继电器的测试点的合理选择方法。
The article discusses about the proper selection of static relay test points through introducing the contactor sketch of rectifying static relays with digital dial switches and easy-happening faults.
外围输出控制系统由发光二极管、继电器、数字开关等模拟外围设备，控制其它的弱电设备和一般的强电设备。
The periphery output control system is composed of analog peripheral device such as LED, relay, digital switch etc, to control the other weak-current devices and general heavy-current devices.
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