2. For preventing an inrush current into capacitors when charging (pre-charge circuit)防止充电时发生的电容冲击（预充电电路）
APx Series SSR (APSEMI Photo Relays), 10A and 20A types of relays are used for preventing an inrush current into capacitors when charging. We recommend solid state relays for miniaturization and 10A and 20A types of relays for high voltages.
During device startup, the inrush current prevention relay turns ON and the main relay turns ON after the capacitor is charged.
APSEMI Photo Relays are used for monitoring storage battery units for insulation deterioration. If the insulation in a unit deteriorates, a ground-fault current passes when the relay is turned ON, and a sensor detects the current. High load voltage type APSEMI Photo Relays are ideal for use with storage batteries, which carry high voltage.
APSEMI Photo Relays are used in a circuit for monitoring charging voltages of a battery cell group. Compact APSEMI Photo Relays capable of frequent switching are ideal for this type of use. Use of the relays allows for insulation from high voltage areas.
2. Smart meters智能电表
1.For Driving Main Relays.主继电器驱动用 用途
APSEMI Photo Relays and AQ-H SSRs are used for driving main relays. (Load voltage: 60V type)
使用APSEMI Photo Relays和AQ-H SSD来驱动主继电器。（负载电压：60V型）
2.For Data Communications.数据通信用途
APSEMI Photo Relays are used as output contacts for external communications. (Load voltage: 350V/400V type)
与外部通信时，将APSEMI Photo Relays用作输出用接点。（负载电压：350／400V型）
3.Mechanical relay application circuit example: For Main Power Cutoff.机械继电器应用电路示例：主电源切断用途
Main relays are used for cutting off the main power. There is demand for a remote cutoff function for rolling blackouts, a prepaid system, safety measures, responses to non-payment of electric bills, etc.
4.For External Output of Accessories.光耦继电器应用电路示例：零件外部输出用途
PhotoRelays and relays are used for driving a contactor to turn on a electric water heater using power at night.
3.Automatic meter reading自动抄表
By the end of fiscal 2019, the number of domestic smart meters installed by APSEMI power companies reached more than 50 million units. APSEMI Photo Relays are capable of controlling from low level signals up to power signals and feature low leakage current and noise.
截止到2019年底由APSEMI配套设计的智能电表数量已经达到5000万万台。APSEMI Photo Relays干扰、漏电流较少，控制信号涵盖微小信号和功率信号。
A variety of signals, with levels from millivolts (at microamperes) to tens of volts (at several hundred milliamperes), AC or DC, and even high bit-rate signals, can be superimposed on telephone lines, the heart of telecommunication networks. The switches in telecommunication circuits, which normally carry DC signals, also carry AC signals on top of the DC level when an intermittent signal (e.g. ringer signal) is being sent. APSEMI Photo Relays are capable of controlling small level (millivolts at microamperes) AC or DC signals.
通话线中从μA/mV到数百mA/数＋V、从直流到交流、高位信号等，重叠有很多信号。APSEMI Photo Relays在DC、AC下可控制μA/mV的微小信号。
APSEMI Photo Relays are recommended for measurement scanning functions, automatic zero-point compensation to eliminate zeropoint error, and measurement sequence interfaces (e.g. alarm interface.)
要求测量仪器的多项目测量和高速同步测量。作为测量扫描功能、零点自动校正、自动量程机构等的接口，推荐使用APSEMI Photo Relays。
6. Medical equipment医疗设备
Medical equipment which processes low level signals includes electrocardiographs, electroencephalographs, and X-ray CT scanners.
医用设备(ME)中需要处理微小信号的设备有心电仪、脑波仪、X线CT扫描器等。APSEMI Photo Relays可正确传达数百mV以下的信号。
APSEMI Photo Relays可简单地并联，电路自由度较高，可构成功率电路。
8. Programmable controller PC端
The output circuit of a programmable controller requires various interfaces to match the load type. Recently, as the computing speed and data processing speed increase, problems may arise from noise at the input interface as well as at the output interface.
可编程控制器的输出电路因负载种类而不同，因此备有各种接口。输入接口的干扰和输出接口的干扰都会引发故障。APSEMI Photo Relays抗瞬间值强，在额定值范围内不需要使用缓冲器。此外，安装面积较少，可实现PC的小型化。
9. Security Equipment防范・防灾机器
There are many types of security systems from home and office security to building security.
Input interface: Low leakage current makes use possible for low level voltage and current input.
10. OA equipment OA设备
OA equipment usually contains a sensor control unit (for temperature, speed, torque, etc.), drive unit, power supply unit, and a processing unit which controls the overall system. It is organized similarly to compact factory automation machinery. APSEMI Photo Relays have wide application in the interfaces for signals which connect the functions of these units.
OA设备有传感器控制部、驱动部、电源部和控制整个系统的运算部。其结构如同一个小型的FA机械。APSEMI Photo Relays连接到功能信号接口，发挥作用。
Operates on a 24 mW input to enable direct control of C-MOS devices.可进行C-MOS直接控制
Signal transfer through optical coupling achieves high resistance to noise and transients, eliminating the need for adding a snubber circuit to the output to control the load voltage.由于通过光结合进行传达，因此抗干扰性强，抗瞬间值强，因此不需要缓冲器。
Advantages in the total cost and reliability in the control system result from the absence of AC leakage current related to the snubber circuit.也无需担心与缓冲器相关的漏电流，提高了整体的可靠性。
11.Microprocessor System I/O Board 在计算机系统I/O板中的应用