施耐德SSR固态继电器

e-mail:**************User’s GuideSSRL240/SSRL660 SERIESSolid State RelaysShop online atIt is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. acceptsno liability for any errors it contains, and reserves the right to alter specifications without notice.WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.PRECAUTIONSA number of essential safety precautions must be observed in the installation and use of a Solid State Relay (SSR).The SSRs should be installed and serviced by qualified technicians familiar with high voltage and current circuits. Note that an SSR has a small leakage current when the contacts are “open”. Normal failure condition is contacts “closed”. A special Fast Blowing I2T fuse and a mechanical interrupt switch are recommended in the load circuit. In certain applications a mechanical interrupt switch should be installed in the control circuit.GENERAL DESCRIPTIONThe Omega®Solid State Relays (SSR’s) are a series of single-pole, normally open, solid state switching devices with no moving parts, capable of tens of millions of cycles of operation. It is designed to control 120V, 240V or 480V (up to 660V) alternating current (VAC), and provides zero voltage switching and 2500VAC isolation between the load terminals and the control signal. A control signal (AC or DC input, depending on unit selected) causes the SSR to switch the ac load ON or OFF just as a conventional mechanical contact switch does but with none of the problems associated with moving contact relays, such as corrosion, pitting, arcing, radio frequency interference (RFI) and bounce. The result: much longer life for the SSR.The SSR is designed around a pair of SCR’s mounted on a heat-spreading metal base to eliminate thermal fatigue failures. To dissipate the heat developed naturally in an SSR due to a nominal voltage drop across the device, the SSR must be mounted on a Finned Heat Sink (FHS), or on a metal plate of adequate size (see Section 4). It is advisable to install an SSR where the ambient temperature is relatively low because its current-switching rating is decreased as its temperature increases.Control resistance heaters up to 40 kW use solid state relays in conjunction with lower-rated temperature controllers. Three-phase loads can be controlled using 2 or 3 SSR’s. Use 3 SSR’s for Y-phase loads using a neutral line. Three solid state relays are also used when there is no neutral load to provide redundancy and extra assurance of control. Two SSRs will control “delta” loads with no neutral line.1FINNED HEAT SINKS (FHS)The Finned Heat Sinks (FHS) are anodized, aluminum fabrications which come complete with tapped mounting holes, and screws to mount the SSR.FHS-1 and FHS-2 Heat SinkFHS-1 - FHS-2 Heat SinkFHS-6 Heat Sink (0.7°C/W Thermal Rating)FHS-6 Heat Sink2FUSE PROTECTIONThe load side of the SSR should be protected by a Fast-Blowing I 2T fuse.Recommended fuses and part numbers are given in below. Although asemiconductor relay is designed for virtually countless operation cycles, it can be destroyed by an over-voltage or a short circuit, unless protected adequately by the fast fuse.Table 3-1 shows the part numbers of the fuses and fuse blocks that can be used with each of the SSRs. Lower rated fast-blow fuses should be used if the current being controlled is below the rated capacity of the SSR. Bussman or equivalent fuses should be used. It is essential that a proper fast-blow (I 2T)fuse is used. SSR’s normal failure mode on overloaded circuits is closed contacts (ON-STATE).LEAKAGE CURRENTIn the OFF state, all SSRs have a small leakage current through their contacts,typically .1mA for 240V versions and .25mA for 660V versions. As a result, a voltage potential will always exist on the LOAD SIDE, even when the “contacts”are “open”. The voltage level is a function of the load resistance. In accordance with E = IR, the voltage level equals leakage current times load resistance.The voltage level will rise to FULL LINE VOLTAGE under NO LOAD (open circuit) or high resistance conditions. Under normal operating conditions,however, it is very small. A 120-Watt (W) load has a resistance of 1 ohm. With “open contacts”, a leakage current of 15mA will cause 15mV across the load (E = 15 mA ×1 ohm). A mechanical switch is recommended between the AC power source and the SSR to provide electric isolation for servicing the load.SSR Part Maximum Fuse Part Fuse Block Number Current Capacity Number Part NumberSSRL240AC1010 Amps ac KAX-10FB-1, FB-2, FB-3SSRL240AC2525 Amps ac KAX-25FB-1, FB-2, FB-3SSRL240AC50 50 Amps ac KAX-50 BS101SSRL240AC7575 Amps ac KAX-70BS101SSRL240AC100100 Amps ac KAX-100BS101SSRL240DC1010 Amps ac KAX-10FB-1, FB-2, FB-3SSRL240DC2525 Amps ac KAX-25FB-1, FB-2, FB-3SSRL240DC50 50 Amps ac KAX-50 BS101SSRL240DC7575 Amps ac KAX-70BS101SSRL240DC100100 Amps ac KAX-100BS101SSRL660AC5050 Amps ac KAX-50BS101SSRL660AC7575 Amps ac KAX-70BS101SSRL660AC100100 Amps ac KAX-100BS101SSRL660DC5050 Amps ac KAX-50BS101SSRL660DC7575 Amps ac KAX-70BS101SSRL660DC100100 Amps ac KAX-100BS1013O u t p u t -a c L o a dM a x . O f f -S t a t e L e a k a g e N o m i n a l a c L i n eN o m i n a l L o a d M a x . C o n t a c t (25°C m a x . a m b i e n t )M a x F o r w a r d M o d e l N o .V o l t a g eC u r r e n t V o l t a g eD r o p120V a c 240V a c 660V a c V o l t a g e D r o p S S R L 240A C 1010 A 0.1 m A 0.1 m A 1.35S S R L 240A C 2525 A 0.1 m A 0.1 m A 1.35S S R L 240A C 5024 t o 280V a c50 A 1.6V0.1 m A 0.1 m A N /A 1.35S S R L 240A C 7575 A 0.1 m A 0.1 m A 1.3S S R L 240A C 100100 A 0.1 m A 0.1 m A 1.3S S R L 240D C 1010 A 0.1 m A 0.1 m A 1.35S S R L 240D C 2525 A 0.1 m A 0.1 m A 1.35S S R L 240D C 5024 t o 280V a c50 A 1.6V0.1 m A 0.1 m A N /A 1.35S S R L 240D C 7575 A 0.1 m A 0.1 m A 1.3S S R L 240D C 100100 A 0.1 m A 0.1 m A 1.3S S R L 660A C 5050 A 0.25 m A 0.25 m A 0.25 m A 1.35S S R L 660A C 7548 t o 660V a c75 A 1.6V0.25 m A 0.25 m A 0.25 m A 1.3S S R L 660A C 100100 A 0.25 m A 0.25 m A 0.25 m A 1.3S S R L 660D C 5050 A 0.25 m A 0.25 m A 0.25 m A 1.35S S R L 660D C 7548 t o 660V a c75 A 1.6V0.25 m A 0.25 m A 0.25 m A 1.3S S R L 660D C 100100 A 0.25 m A 0.25 m A 0.25 m A 1.3E L E C T R I C A L S P E C IF I C A T I O N S4I n p u t -C o n t r o l S i g n a l C o n t r o l S i g n a l C o n t r o l S i g n a l C o n t r o l S i g n a l M a x I n p u t P e a k V o l t a g e *M o d e l N o .T y p eV o l t a g e T u r n -O n T u r n -O f f C u r r e n t (60 s e c . m a x )S S R L 240A C 10S S R L 240A C 25S S R L 240A C 50A C C o n t r o l S i g n a l90 t o 280V A C 90V A C 10V A C10m A 800VS S R L 240A C 75S S R L 240A C 100S S R L 240D C 10S S R L 240D C 25S S R L 240D C 50D C C o n t r o l S i g n a l 3 t o 32V D C 3V D C 1V D C 14m A 800VS S R L 240D C 75S S R L 240D C 90S S R L 660A C 50S S R L 660A C 75A C C o n t r o l S i g n a l90 t o 280V A C 90V A C 10V A C10m A1200VS S R L 660A C 100S S R L 660D C 50S S R L 660D C 75D C C o n t r o l S i g n a l4 t o 32V D C 4V D C1V D C14m A1200VS S R L 660D C 100E L E C T R I C A L S P E C IF I C A T I O N S *T r a n s i e n t s a b o v e t a b l e v a l u e s h o u l d b e s u p p r e s s e d .5The following SSRs are available from OMEGA Engineering.MOUNTING THE SSRThe SSR assembly (including heat sink) can be located close to the load,minimizing the lengths of power cables. The actuating device, such as atemperature controller, can then be located in an area more convenient to the operator.The FHS on which the SSR is to be mounted has been pre-drilled and tapped, and is supplied with mounting screws. The SSR is supplied with a thermallyconducting pad (attached). Mount the SSR securely to the heat sink with the mounting screws.The best location for the SSR is an open area with unrestricted air movement.The FHS should be mounted on a vertical surface with the fins vertical. If it is mounted with the fins horizontal, or on a horizontal surface, the thermalcoefficient must be re-dated by 20%. For air flow, allow at least 1⁄2in. clearance at each end and 1 in. on the sides.67OUTPUTSSR Dimensions (inches)SPECIFICATIONSGENERAL SPECIFICATIONS(1)PARAMETER ALL DEVICESOperating Temperature Range–20°to +80°CStorage Temperature Range–40°to +80°CInput to Output Isolation Voltage(2)4000 V rmsInput/Output to Ground Isolation Voltage2500 V rmsCapacitance Input to Output (Max)8 pFLine Frequency Range47 to 63 HzINPUT SPECIFICATIONS(1)PARAMETER SSRs DC SSRsControl Voltage90–280 VAC3–32 VDC (4)Drop Out Voltage10 Vrms 1.0 VDCMaximum Input Current(3)10 mA rms14 mADCTurn-On Time20 ms0.5 Cycle Max.(5)Turn-Off Time30 ms0.5 Cycle Max.Nominal Input Impedance Current RegulatedOUTPUT SPECIFICATIONS(1)PARAMETER SSRs UNITSMaximum On-State Current(6)10255075100Arms Minimum On-State Current5050100100100mArms Maximum 1-Cycle Surge(7)15030075010001200Apeak Maximum 1-Second Surge(8)3075150225300Apeak On-State Voltage Drop(9) 1.35 1.35 1.3 1.3 1.3Vpeak I2T (60 Hz)416937245850006000A2secFOOTNOTES(1)Specifications apply to T A–30 to +80°C unless otherwise noted.(2)At T A of 25°C for one second, maximum leakage 1 mA.(3)At maximum input voltage.(4)660V versions 4-32VDC(5)Zero cross over firing.(6)With relay properly mounted on an adequate heatsink.(7)At T A of 25°C, non-repetitive.(8)At T A of 25°C.(9)At T A of 25°C and maximum on-state current.8WARRANTY/DISCLAIMEROMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. 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输入（控制）参数（TA=25℃）其它参数（TA=25℃）输入电压范围（直流）3-32VDC介质耐压4000VAC(输入与输出间)2500VAC （输入、输出与底座间）确保接通电压（直流） 3.0VDC 绝缘电阻1000M Ω（500VDC ）确保关断电压（直流） 1.0VDC 工作温度范围-30℃~80℃输入电流(典型值)18mA 储存温度范围-30℃~100℃输入电流(最大值)25mA 重量约20g反极性电压（直流）-32VDC输出（负载）参数（TA=25℃）2FD11052FD22052FD4005输出电压范围5~110VDC 5~220VDC 5~400VDC 最大瞬态电压120Vpk 260Vpk 440Vpk 最大输出漏电流1mA1mA1mA最大输出压降 1.0Vrms最大负载电流3A 、5A 、10A （强迫风冷）最大浪涌电流（10ms ）额定电流的10倍最小功率因数0.5最大接通时间1ms 最大关断时间8ms 断态电压指数上升率dv/dt 100V/μs 最小工作电流30mA订货标记示例性能曲线图S S R2F48 03最大负载电流与环境温度特性图（）5A环境温度（℃）最大（）A 最大负载电流与环境温度特性图（）3A3.02.41.81.20.6环境温度（℃）最大（）A最大负载电流与环境温度特性图（） 10A环境温度（℃）讅︳題磢︳ 髛︳ 竲簘詝貆祡︳ 鐌羮︳ 鱹︳ （）A -20 0 20 4安装孔尺寸图使用说明：1、实际负载电流≥5A时必须使用风冷对SSR进行散热冷却。

2、固态继电器的自身功耗产生的热量需要通过外壳散热，如果固态继电器周围散热条件很差，则输出负载电流应降额。

3、当两只或以上数量固态继电器并排安装时，应留有足够的间距（10mm以上）。

4、当多只固态继电器共用一个控制电源时，输入控制端可以串联或并联使用；但必须保证每只固态继电器有足够的输入驱动电流。

5、使用于感性负载时，将会出现高瞬间电压和浪涌电流施加在输出端，可能导致固态继电器误导通或损坏。

固态继电器的技术参数工作原理及其选型固态继电器（Solid State Relay，SSR）是一种使用半导体器件作为控制元件，替代传统电磁继电器的电器开关装置。

固态继电器具有快速响应、可靠性高、抗干扰能力强等特点，广泛应用于自动化控制系统、电力系统、机械设备等领域。

下面将对固态继电器的技术参数、工作原理及其选型进行详细介绍。

一、固态继电器的技术参数1.额定电压：固态继电器的额定电压指的是继电器能够承受的最大电压。

常见的额定电压有3-32VDC、5-60VDC、12-380VAC等。

2.额定电流：固态继电器的额定电流指的是继电器能够承受的最大电流。

常见的额定电流有10A、25A、40A、80A等。

3.输入电阻：固态继电器的输入电阻是指在控制端接入继电器时，继电器对输入信号的阻抗大小。

输入电阻越大，控制电流所消耗的功率越小。

4.输出电阻：固态继电器的输出电阻是指在输出端的负载上产生的电阻。

输出电阻越小，继电器输出的电压越稳定。

5.工作温度范围：固态继电器的工作温度范围是指继电器能够正常工作的温度范围。

一般情况下，工作温度范围为-40℃到+80℃之间。

二、固态继电器的工作原理当控制电路输入的电流大于等于继电器的激活电流时，继电器将被激活并输出电压。

反之，如果输入电流小于继电器的激活电流，则继电器保持断开状态。

三、固态继电器的选型在选型固态继电器时，需要考虑以下几个方面的因素：1.负载类型：根据实际应用需求选择适合的负载类型，固态继电器可用于交流负载和直流负载。

2.额定电压和额定电流：根据负载的额定电压和额定电流选择对应的固态继电器。

额定电压和额定电流应略大于负载的实际值，以保证稳定可靠的开关动作。

3.工作温度范围：根据实际工作环境的温度范围选择适合的固态继电器。

4.响应时间：对于需要快速响应的应用场合，需要选择响应时间较短的固态继电器。

5.安装方式：根据实际安装方式选择合适的固态继电器，可以是面板安装、导轨安装或者插座安装。

固态继电器原理及接线方法固态继电器（Solid State Relay，简称SSR）是一种非接触式的电力控制元件，它能够将微弱的控制信号转换成相应的高功率负载输出信号，实现电路的开关控制。

本文将介绍固态继电器的原理以及常见的接线方法。

固态继电器由输入控制电路、输出负载电路和隔离传导电路三部分组成。

输入控制电路通常由光电耦合器和触发电路构成，它可以实现高低电平的转换，将来自低压电路的微弱控制信号转换为高压电路的驱动信号。

输出负载电路由一对双向可控硅三极管和电流保护电路构成，它可以根据输入控制信号的变化打开或关闭电路，并将高功率的负载电流传导至外部负载。

隔离传导电路则起到隔离输入与输出电路的作用，避免输入与输出电路之间的电气干扰。

1.直流控制接线：直流控制接线方式包括无源式和有源式两种方式。

（1）无源式直流控制接线方法：这种接线方法是将固态继电器的控制端与直流信号源相连，其中直流信号源可以是直流电源、开关、传感器等。

具体接线方法为：将正极（+）与控制端（+)相连，负极（-）与控制端（-)相连。

在这种方式下，只需要将直流信号源的电压高于触发电压即可激活固态继电器。

此时，当外部触发电路通电，通过光电耦合器输出的光电信号就能够导通SSR的输出端，实现电路的开关控制。

（2）有源式直流控制接线方法：这种接线方法是在无源式直流控制接线的基础上加入控制电源，以增强驱动能力和稳定性。

具体接线方法为：将固态继电器的控制端与控制信号源相连，控制信号源可以是可控硅、继电器、PLC等。

在这种方式下，通过控制信号源的开关状态，控制电源的导通与否，从而实现固态继电器的驱动。

2.交流控制接线：交流控制接线方式包括零火控制接线和触发控制接线两种方式。

（1）零火控制接线方法：这种接线方法是将固态继电器的控制端与零线相连，控制端不接接地线。

具体接线方法为：将控制端与电源的零线相连，在这种方式下，固态继电器的输出信号与交流输入电源的零线同步，从而实现电路的控制。

SSR固态继电器的原理
固态继电器首要由输入(操控)电路，驱动电路和输出(负载)电路三有些构成。

固体继电器的输入电路是为输入操控信号供给一个回路，使之变成固体继电器的触发信号源。

固体继电器的输入电路多为直流输入，单个的为沟通输入。

直流输入电路又分为阻性输入和恒流输入。

阻性输入电路的输入操控电流随输入电压呈线性的正向改动。

恒流输入电路，在输入电压抵达必定值时，电流不再随电压的添加而显着增大，这种继电器可适用于恰当宽的输入电压计划。

固体继电器的驱动电路能够包含隔绝耦合电路、功用电路和触发电路三有些。

隔绝耦合电路，如今多选用光电耦合器和高频变压器两种电路办法。

常用的光电耦合器有光－三极管、光－双向可控硅、光－二极管阵列(光－伏)等。

高频变压器耦合，是在必定的输入电压下，构成约十MHz的自激振荡，经过变压器磁芯将高频信号传递到变压器次级。

功用电路可包含检波整流、过零、加快、维护、闪现等各种功用电路。

触发电路的效果是给输出器材供给触发信号。

固体继电器的输出电路是在触发信号的操控下，完毕固体继电器的通断切换。

输出电路首要由输出器材(芯片)和起瞬态按捺效
果的吸收回路构成，有时还包含反响电路。

如今，各种固体继电器运用的输出器材首要有晶体三极管(Transistor)、单向可控硅(Thyristor 或SCR)、双向可控硅(Triac)、MOS场效应管(MOSFET)、绝缘栅型双极晶体管(IGBT)等。

ssr固态继电器工作原理SSR固态继电器（Solid-State Relay）是一种使用半导体器件来实现电气隔离和电路开关的电子元件。

相比传统的机械继电器，SSR 具有响应速度快、寿命长、体积小、耐振动、无噪音等优点。

本文将从SSR固态继电器的工作原理、结构组成和应用领域等方面进行详细介绍。

一、工作原理SSR固态继电器的工作原理基于半导体器件的导通与截止特性。

它由输入控制电路和输出功率电路两部分组成。

输入控制电路接收外部的控制信号，通过对控制电路中的半导体器件进行驱动，使得输出功率电路中的半导体器件导通或截止，从而实现对输出电路的控制。

具体来说，输入控制电路通常由光耦隔离器、驱动电路和触发电路组成。

当输入控制信号到达时，光耦隔离器将信号光电转换，驱动电路将光电信号转换为电流或电压信号，进而通过触发电路对输出功率电路进行控制。

输出功率电路由半导体器件（如晶闸管、三极管）和负载组成。

当输入控制电路中的半导体器件导通时，输出功率电路中的半导体器件也将导通，从而使得负载得到电源的供电；当输入控制电路中的半导体器件截止时，输出功率电路中的半导体器件也将截止，负载将不再接收电源供电。

二、结构组成SSR固态继电器的基本结构通常包括输入控制电路、输出功率电路和隔离层。

其中，输入控制电路主要负责接收和处理外部的控制信号；输出功率电路主要负责对负载进行电源的控制；隔离层则起到隔离输入控制电路和输出功率电路的作用，保证两者之间的电气隔离。

在输入控制电路中，光耦隔离器起到了关键作用。

光耦隔离器通常由发光二极管（LED）和光敏三极管（光电晶体管）构成。

当输入控制信号到达时，LED被激活，发出特定的光信号；光敏三极管根据接收到的光信号的强弱，产生相应的电流或电压信号。

输出功率电路中的半导体器件通常由晶闸管或三极管构成。

晶闸管具有导通电流大、耐压能力强的特点，适用于大功率负载的控制；而三极管则适用于小功率负载的控制。

这些半导体器件能够通过输入控制电路的驱动来实现导通或截止状态，从而控制负载的电源供应。

Solid state relaysSSR固态继电器以触发形式,可分为零压型(Z)和调相型(P)两种。

在输入端施加合适的控制信号VIN时,P型SSR立即导通。

当VIN撤销后,负载电流低于双向可控硅维持电流时(交流换向),SSR关断。

Z型SSR内部包括过零检测电路,在施加输入信号VIN时,只有当负载电源电压达到过零区时,SSR才能导通,并有可能造成电源半个周期的最大延时。

Z型SSR关断条件同P型,但由于负载工作电流近似正弦波,高次谐波干扰小,所以应用广泛。

先锋公司电子厂SSR由于采用输出器件不同,有普通型(S,采用双向可控硅元件)和增强型(HS,采用单向可控硅元件)之分。

当加有感性负载时,在输入信号截止t1之前,双向可控硅导通,电流滞后电源电压90O(纯感时)。

t1时刻,输入控制信号撤销,双向可控硅在小于维持电流时关断(t2),可控硅将承受电压上升率dv/dt很高的反向电压。

这个电压将通过双向可控硅内部的结电容,正反馈到栅极。

如果超过双向可控硅换向dv/dt指标(典型值10V/s,将引起换向恢复时间长甚至失败。

单向可控硅(增强型SSR)由于处在单极性工作状态,此时只受静态电压上升率所限制(典型值200V/s),因此增强型固态继电器HS系列比普通型SSR的换向dv/dt指标提高了520倍。

由于采用两只大功率单向可控硅反并联,改变了电流分配和导热条件,提高了SSR输出功率。

增强型SSR在大功率应用场合,无论是感性负载还是阻性负载,耐电压、耐电流冲击及产品的可靠性,均超过普通固态继电器,并达到了进口产品的基本指标,是替代普通固态继电器的更新产品。

固态继电器的应用S系列固态继电器,HS系列增强型固态继电器、可以广泛用于:计算机外围接口装置,恒温器和电阻炉控制、交流电机控制、中间继电器和电磁阀控制、复印机和全自动洗衣机控制、信号灯交通灯和闪烁器控制、照明和舞台灯光控制、数控机械遥控系统、自动消防和保安系统、大功率可控硅触发和工业自动化装置等。

固态继电器（SSR）的定义■固态继电器(SSR)的定义●SSR和有接点继电器的不同所谓SSR，是固态继电器（Solid State Relay）的简称，是⽆可动接点部分的继电器（⽆接点继电器）。

在动作上与有接点继电器相同，但是该继电器使⽤半导体闸流管、晶闸管开关元件、⼆极管、晶体管等半导体开关元件。

另外也使⽤名为光电耦合器的光半导体，使其输⼊输出绝缘。

光电耦合器的特点是⽤光的信号在绝缘空间中进⾏传送，所以绝缘性更好，传送速度也更快。

SSR是⽤⽆接点的电⼦零件制造的，⽐有接点的有很多优点。

其中最⼤的优点是，不会像有接点继电器⼀样因开关⽽损耗接点。

特别是：●可以对应⾼速、⾼频率开关●没有接触不良●发⽣⼲扰⼩●没有动作⾳等，适⽤于⼴泛的领域。

固态继电器(SSR)的构成固态继电器(SSR)的构成固态继电器(SSR) （交流负载开关的代表⽰例）固态继电器(SSR) （交流负载开关的代表⽰例）电磁继电器 (EMR:Electro Magnetic Relay)向线圈施加输⼊电压，使其发⽣电磁⼒，移动可动铁⽚，从⽽切换接点。

不仅可在控制柜上使⽤，还可⽤于其他范围。

⽽且原理简单可低成本加⼯。

电磁继电器(EMR:Electro Magnetic Relay)●SSR的控制（ON/OFF控制、循环控制、相位控制）ON/OFF控制接受温控器的电压输出信号，通过开关SSR来控制加热器的ON/OFF。

在电磁继电器中也可进⾏相同的控制，但是以数秒间隔控制ON/OFF，使⽤数年时需要SSR。

循环控制（G32A-EA）以0.2秒（固定）为控制周期。

其⽅式是使其在0.2秒内ON/OFF，从⽽控制输出电⼒。

接受温控器的电流输出4~20mA来控制循环控制中的注意点进⾏循环控制时，每秒钟接通电源5次（控制周期为 0.2S）。

由于变压器负载中的接通电流⾮常⼤（通常电流的10倍左右）(1)SSR的额定没有余量导致SSR的破坏。

(2)负载电路上的断路器发⽣触发。

固态继电器固态继电器固态继电器（Solid State Relay,缩写SSR），是由微电子电路，分立电子器件，电力电子功率器件组成的无触点开关；是一种两个接线端为输入端，另两个接线端为输出端的四端器件，中间采用隔离器件实现输入输出的电隔离。

固态继电器的输入端用微小的控制信号，达到直接驱动大电流负载。

中文名固态继电器外文名Solid State Relay简称SSR解释由微电子电路基本简介固态继电器固态继电器是具有隔离功能的无触点电子开关，在开关过程中无机械接触部件，因此固态继电器除具有与电磁继电器一样的功能外，还具有逻辑电路兼容，耐振耐机械冲击，安装位置无限制，具有良好的防潮防霉防腐蚀性能，在防爆和防止臭氧污染方面的性能也极佳，输入功率小，灵敏度高，控制功率小，电磁兼容性好，噪声低和工作频率高等特点。

固态继电器专用的固态继电器可以具有短路保护，过载保护和过热保护功能，与组合逻辑固化封装就可以实现用户需要的智能模块，直接用于控制系统中。

固态继电器如今已广泛应用于计算机外围接口设备、恒温系统、调温、电炉加温控制、电机控制、数控机械，遥控系统、工业自动化装置；信号灯、调光、闪烁器、照明舞台灯光控制系统；仪器仪表、医疗器械、复印机、自动洗衣机；自动消防，保安系统，以及作为电网功率因素补偿的电力电容的切换开关等等，另外在化工、煤矿等需防爆、防潮、防腐蚀场合中都有大量使用。

如何选择SSR的型号规格主要是选取适当的额定电流的固态继电器（SSR）除特别说明以外，整流、可控等功率模块亦然。

根据不同的负载类型来选用SSR的额定电流。

阻性负载、感性负载和容性负载在刚起动时瞬时电流较大。

即使是纯阻性，由于具有正温度系数，冷态时电阻值较小，因而有较大的起动电流。

电炉刚接通时电流为稳定时的1.3—1.4倍。

白炽灯接通时电流为稳态10倍。

有些金属卤化物灯不但开启时间长达10分钟，而且有高达100倍稳态时的脉冲电流。

异步电动机起动电流为额定值的5—7倍，直流电机起动电流还要大。