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DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 1/12
Overview
In 1974, Opto 22 introduced the first liquid epoxy-filled line of power solid-state relays (SSR). This innovation in SSR design greatly improved the reliability and reduced the cost of manufacturing. At that time, we also incorporated into our manufacturing process 100% testing of every relay produced under full load conditions. By 1978, Opto 22 had gained such a reputation for reliability that we were recognized as the world's leading manufacturer of solid-state relays. Through continuous manufacturing improvements and the same 100% testing policy established 22 years ago, Opto 22 is still recognized today for the very high quality and reliability of its complete line of solid-state relays.
Index Power Series
Page 1 2 3 4 5 6 7 8 Introduction
Description
Z Series
All Models: General Specifications 120/240 Volt AC Power Series: General Specifications 120/240 Volt AC Power Series: Surge Current Data, Thermal Data, and Dimensions 480/575 Volt AC Power Series: General Specifications 120/240 Volt AC Power Series Plastic Package (Z Series): General Specifications AC Power Printed Circuit Series: General Specifications DC Switching Series: General Specifications APPLICATION TIPS
9 10 11 12
Heat Sink Calculation, Duty Cycle Calculation Transformer Loads, Solenoid Loads, and Lamp Loads Solid-State Relays in Series, Lamp Loads, Heater Loads Motor Loads
P Series
MP Series
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
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DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 2/12
Specifications
All Models
* 4,000 V optical isolation input to output * Zero voltage turn-on * Turn-on time: 1/2 cycle maximum * Turn-off time: 1/2 cycle maximum * Operating frequency: 25 to 65 Hz (operates at 400 Hz with six times off-state leakage) * Coupling capacitance input to output: 8 pF maximum * DV/DT Off-state: 200 volts per microsecond * DV/DT commutating: snubbed for rated current at 0.5 power factor * UL recognized * CSA certified * CE component
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 3/12
Specifications
AC Power Series - 120/240 Volt
Opto 22 provides a full range of power series relays with a wide variety of voltage (110-575) and current options (3-45 amps). All Power Series relays feature 4,000 volts of optical isolation and have a high PRV rating.
Nominal Nominal Nominal 1 cycle Signal Surge AC Line Current (Amps) Input Rating Voltage (Amps) Resistance Peak (Ohms) 120 120 120 120 240 240 240 240 380 380 120 120 240 240 240 3 10 25 45 3 10 25 45 25 45 10 25 10 25 45 85 110 250 650 85 110 250 650 250 650 110 250 110 250 650 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 33K 33K 33K 33K 33K Peak Maximum Off-State Operating I2t Rating Signal Output Drop-out Repetitive Voltage Leakage Voltage t=8.3 Voltage (mA) Range Voltage Maximum (ms) Drop Maximum (Volts AC) 1 VDC 1 VDC 1 VDC 1 VDC 1 VDC 1 VDC 1 VDC 1 VDC 1 VDC 1 VDC 10 VAC 10 VAC 10 VAC 10 VAC 10 VAC 600 600 600 600 600 600 600 600 800 800 600 600 600 600 600 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts 2.5mA 7 mA 7 mA 7 mA 5 mA 14 mA 14 mA 14 mA 12 mA 12 mA 7 mA 7 mA 14 mA 14 mA 14 mA 12-140 12-140 12-140 12-140 24-280 24-280 24-280 24-280 24-420 24-420 12-140 12-140 24-280 24-280 24-280 30 50 250 1750 30 50 250 1750 250 1750 50 250 50 250 1750
Model Number
Signal Pick-up Voltage 3VDC (32V allowed) 3VDC (32V allowed) 3VDC (32V allowed) 3VDC (32V allowed) 3VDC (32V allowed) 3VDC (32V allowed) 3VDC (32V allowed) 3VDC (32V allowed) 3VDC (32V allowed) 3VDC (32V allowed) 85 VAC (280 allowed) 85 VAC (280 allowed) 85 VAC (280 allowed) 85 VAC (280 allowed) 85 VAC (280 allowed)
Isolation Voltage
Dissipation jc* (C/Watt) (Watts/Amp)
120D3 120D10 120D25 120D45 240D3 240D10 240D25 240D45 380D25 380D45 120A10 120A25 240A10 240A25 240A45
4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS 4,000VRMS
11 1.3 1.2 0.67 11 1.3 1.2 0.67 1.2 0.67 1.3 1.2 1.3 1.2 0.67
1.7 1.6 1.3 0.9 1.7 1.6 1.3 0.9 1.3 0.9 1.6 1.3 1.6 1.3 0.9
Notes: jc* = Thermal resistance junction to base. Maximum junction temperature is 110C.
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 4/12
Specifications:
Surge Current Data
AC Power Series - 120/240 Volt (Continued)
Thermal Ratings
Time Time* 3-Amp 10-Amp 25-Amp 45-Amp Peak Peak Peak Peak (Seconds) (Cycles) Amps Amps Amps Amps 0.017 0.050 0.100 0.200 0.500 1 2 3 4 5 10 Note: *60 HZ. 1 3 6 12 30 60 120 180 240 300 600 85 66 53 45 37 31 28 27 26 25 24 110 85 70 60 50 40 33 32 31 30 28 250 175 140 112 80 67 53 49 47 45 42 650 420 320 245 175 134 119 98 95 91 84
Dimensional Drawings
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 5/12
Specifications
AC Power Series - 480/575 Volt
DC SERIES: The DC Series delivers isolated DC control to large OEM customers worldwide. AC SERIES: The AC Series offers the ultimate in solid-state reliability. All AC power series relays feature a built-in snubber and zero voltage turn-on. Transient proof models offer self-protection for noisy electrical environments.
Model Number Nominal AC Line Voltage Nominal 1 cycle Nominal Peak Maximum Off-State Operating Signal Signal Current Surge Signal Input Pick-up Drop-out Repetitive Output Leakage Voltage Rating (Amps) Resistance Voltage Voltage Voltage Voltage (mA) Range (Amps) Peak (Ohms) Maximum Drop Maximum (Volts AC) 10 110 1000 3VDC (32V Allowed) 3VDC (32V Allowed) 3VDC (32V Allowed) 3VDC (32V Allowed) 3VDC (32V Allowed) 3VDC (32V Allowed) 1 VDC 1200 3.2 volts 11 mA 100-530 I2t Rating t=8.3 (ms) Isolation jc* Dissipation Voltage (C/Watt) (Watts/Amp)
480D10-12
480
50
4,000VRMS
1.2
2.5
480D15-12
480
15
150
1000
1 VDC
1200
3.2 volts
11 mA
100-530
50
4,000VRMS
1.2
2.5
480D25-12
480
25
250
1000
1 VDC
1000
1.6 volts
11 mA
100-530
250
4,000VRMS
1.3
1.3
480D45-12
480
45
650
1000
1 VDC
1000
1.6 volts
11 mA
100-530
1750
4,000VRMS
0.67
0.9
575D15-12
575
15
150
1000
1 VDC
1200
3.2 volts
15 mA
100-600
90
4,000VRMS
1.2
2.5
575D45-12
575
45
650
1000
1 VDC
1000
1.6 volts
15 mA
100-600
1750
4,000VRMS
0.67
0.9
Note: jc* = Thermal resistance junction to base. Maximum junction temperature is 110C.
Dimensional Drawings
Surge Current Data
Time Time*** 10-Amp 15-Amp 25-Amp 45-Amp Peak Peak Peak Peak Second (Cycles) Amps Amps Amps Amps 0.017 0.050 0.100 0.200 0.500 1 2 3 4 5 10 1 3 6 12 30 60 120 180 240 300 600 110 85 70 60 50 40 33 32 31 30 28 150 140 110 90 70 55 49 47 43 40 35 250 175 140 112 80 67 53 49 47 45 42 650 420 320 245 175 134 119 98 95 91 84
Thermal Ratings
Note: ***60 HZ
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 6/12
Specifications
AC Power Series - 120/240 Volt Plastic Package (z series)
The Z Series employs a unique heat transfer system that makes it possible for Opto 22 to deliver a low-cost, 10-amp, solid-state relay in an all-plastic case. The push-on tool-free quick-connect terminals make the Z Series ideal for highvolume OEM applications.
Nominal Nominal Nominal 1 cycle Signal Surge AC Line Current (Amps) Input Voltage Rating Resistance (Amps) Peak (Ohms) 120 10 110 1000
Model Number
Signal Pick-up Voltage 3VDC (32V allowed) 3VDC (32V allowed)
Signal Drop-out Voltage
Peak Maximum Off-State Operating Repetitive Output Leakage Voltage Voltage Voltage (mA) Range Maximum Drop Maximum (Volts AC)
I2t Rating t=8.3 (ms)
Isolation Voltage
jc* Dissipation (C/Watt) (Watts/Amp)
Z120D10
1 VDC
600
1.6 volts
6 mA
12-140
50
4,000 VRMS 4,000 VRMS
4
1
Z240D10
240
10
110
1000
1 VDC
600
1.6 volts
12 mA
24-280
50
4
1
Notes: jc* = Thermal resistance junction to base. Maximum junction temperature is 110C.
Dimensional Drawings
Current vs. Ambient Ratings
Surge Current Data
Time Second 0.017 0.050 0.100 0.200 0.500 1 2 3 4 5 10 Time*** (Cycles) 1 3 6 12 30 60 120 180 240 300 600 Peak Amps 110 85 70 60 50 40 33 32 31 30 28
Note: ***60 HZ
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 7/12
AC Power - Printed Circuit Package (P & MP Series)
Model Number MP120D2 or P120D2 MP120D4 or P120D4 MP240D2 or P240D2 MP240D4 or P240D4 MP380D4 Nominal Nominal Nominal 1 cycle Signal Input Current Surge AC Line Rating (Amps) Resistance Voltage Amps Peak (Ohms) 120 2 20 1000 Signal Pick-up Voltage 3VDC** (32V allowed) 3VDC** (32V allowed) 3VDC** (32V allowed) 3VDC** (32V allowed) 3VDC (32V allowed) Peak Signal Repetitive Maximum Off-State Operating Output Leakage Voltage Drop-out Voltage Voltage mA Range Voltage Maximum Drop Maximum (Volts AC) 1 VDC 600 1.6 volts 5 mA 12-140 I2 t Rating t=8.3 (ms) 2 Isolation Voltage Dissipation jc* C/Watt Watts/Amp
Specifications
4,000 VR M S
20
1.2
120
4
85
1000
1 VDC
600
1.6 volts
5 mA
12-140
30
4,000 VRM S
6.5
1.2
240
2
20
1000
1 VDC
600
1.6 volts
5 mA
24-280
2
4,000 VRM S
20
1.2
240
4
85
1000
1 VDC
600
1.6 volts
5 mA
24-280
30
4,000 VRM S
6.5
1.2
380
4
85
1000
1 VDC
800
1.6 volts
5 mA
24-420
30
4,000 VRM S
6.5
1.2
Notes: jc* = Thermal resistance junction to base. Maximum junction temperature is 110C. ** = MP Series 24 volts maximum.
Surge Current Data
2-Amp 4-Amp Time Time* P or MP P or MP Second (Cycles) Peak Peak Amps Amps 0.017 0.050 0.100 0.200 0.500 1 2 3 4 5 10 1 3 6 12 30 60 120 180 240 300 600 20 18 15 11 9 8.5 8 7.5 7 6.5 6 85 66 53 45 37 31 28 27 26 25 24
Model P240D4
Model MP240D4
Note: *60 HZ
Dimensional Drawings
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 8/12
Description
DC Switching Series
MP Series P Series Power Series
Thermal Ratings
Specifications
DC60P or DC60MP Operating Voltage Range Forward Voltage Drop Nominal Current Rating Off-State Blocking Signal Pickup Voltage Signal Dropout Voltage Signal Input Impedance 1 Second Surge Operating Temp. Range Isolation Voltage Off-state Leakage Package Type 5-60 VDC 1.5 volts at 3 amps 3 amps 60 VDC 3 VDC 32 Volts* allowed 1 VDC DC200P or DC200MP 5-200 VDC 1.5 volts at 1 amp 1 amp 250 VDC 3 VDC 32 Volts* allowed 1 VDC DC60S-3 5-60 VDC 1.5 volts at 3 amps 3 amps 60 VDC 3 VDC 32 Volts allowed 1 VDC DC60S-5 5-60 VDC 1.5 volts at 5 amps 5 amps 60 VDC 3 VDC 32 Volts allowed 1 VDC
Dimensional Drawings
1,000 ohms 1,000 ohms 1,000 ohms 1,000 ohms 5 amps -40 C to 100 C 2 amps -40 C to 100 C 5 amps -40 C to 100 C 10 amps -40 C to 100 C
4,000 VRMS 4,000 VRMS 4,000 VRMS 4,000 VRMS 1 mA maximum P/MP series 1 mA maximum P/MP series 1 mA maximum Power series 1 mA maximum Power series
Note: *MP series maximum allowed control signal 24 VDC.
Dimensional Drawings
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 9/12
Applications
Tips
Heat Sink Calculation
Like all semiconductor devices, SSR current ratings must be based on maximum junction temperature. All Opto 22 SSRs operate conservatively at maximum junction temperatures of 110 C. Determining an adequate heat sink for a given SSR conducting a given current is very simple. Note: Thermally conductive grease must be used between the relay base and the heat sink.
Sample Calculation Given:
120-Volt, 20-Amp Load 50 C Ambient Air Choose Model 120D25 SSR. Calculate dissipation as: 20 amps x 1.3 Watts per amp = 26 Watts Calculate temperature rise junction to SSR base as: 26 Watts x 1.2 C per Watt = 31.2 C Calculate allowable temperature of heat sink by subtracting 31.2 C from 110 C allowable junction temperature: 110 C-31.2 = 78.8 C The heat sink is in a 50C ambient, therefore, allowable temperature rise on heat sink is: 78.8 C-50 C = 28.8 C If heat sink is allowed to rise 28.8 C above ambient, then the thermal resistance of the heat sink is simply the 28.8 C rise divided by the 26 Watt. Any heat sink having a thermal resistance less than 1.1 C per Watt will be adequate.
Duty Cycle Calculation
When solid-state relays are operated in an on/off mode, it may be advantageous to calculate the RMS value of the current through the SSR for heat sinking or determining the proper current rating of the SSR for the given application. IRMS = RMS value of load or SSR T1 = Time current is on T2 = Time current is off ION = RMS value of load current during on period
IRMS =
(ION) x T1 T1 + T2
2
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 10/12
Applications
Tips (Continued)
Transformer Loads Solenoid Valve and Contactor Loads
Careful consideration should be given to the selection of the proper SSR for driving a given transformer. Transformers are driven from positive saturation of the iron core to negative saturation of the core each 1/2 cycle of the alternating voltage. Large inrush currents can occur during the first 1/2 cycle of line voltage when a zero voltage SSR happens to turn on during the positive 1/2 cycle of voltage when the core is already in positive saturation. Inrush currents greater than 10 times rated transformer current can easily occur. The following table provides a guide for selecting the proper SSR for a given transformer rating.
120-Volt Transformers SSR MODEL P or MP 120D2 Z120D10 120D3 P or MP 120D4 120D10 or 120A10 120D25 or 120a25 120D45 TRANSFORMER 100 VA 500 VA 100 VA 250 VA 500 VA 1 KVA 2 KVA
All Opto 22 SSRs are designed to drive inductive loads such as solenoid valves and electromechanical contactors. The built-in snubber in each SSR assures proper operation into inductive loads. The following table is a guide in selecting an SSR to drive a solenoid or contactor.
120-Volt Coils SSR CURRENT RATING 2-Amp 4-Amp SOLENOID 1-Amp 3-Amp 240-Volt Coils SSR CURRENT RATING 2-Amp 4-Amp SOLENOID 1-Amp 3-Amp CONTACTOR NEMA Size 7 NEMA Size 7 CONTACTOR NEMA Size 4 NEMA Size 7
Control Current Calculation
240-Volt Transformers P or MP240D2 7240D10 120D3 P or MP240D4 240D10 or 240A10 240D25 or 240A25 240D45 200 VA 1 KVA 200 VA 500 VA 1 KVA 2 KVA 4 KVA
All Opto 22 DC controlled SSRs have a control circuit consisting of 1000 ohms in series with an LED. Since 3 volts is required to turn on any SSR, the maximum current required is (3 volt - 1 volt) divided by 1000 ohms which equals 2.0 mA. The 1 volt is subtracted from the 3 volt signal because 1 volt is dropped across the LED. For higher control voltages, an external resistor can be added in series with the control voltage to limit the control current. To limit the control current to 2 mA, calculate the external resistor RC = 500 (EC- 3) where EC = the control voltage. The DC control voltage range is 3-32 VDC. To calculate the control current for any voltage within the 3-32 VDC range, use the formula: IC = EC - 1 1000 where RC = zero. With a 5V control signal, IC = 5-1 1000 = 4 mA.
480-Volt Transformers SSR MODEL 480D10-12 480D15-12 TRANSFORMER 5-Amp Primary 5-Amp Primary
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 11/12
Applications
Tips (Continued)
Solid-State Relays In Series
In applications requiring greater current rating at higher voltage, two Opto 22 SSRs may be operated in series for double the voltage rating. The built-in snubber in each SSR assures proper voltage sharing of the two SSRs in series. In the diagram below, two 240-volt, 45-amp SSRs are connected in series for operation on a 480-volt line. The control is shown with a parallel hook-up but it should be noted that a serial connection can also be implemented.
Lamp Loads
Heater Loads
Since all Opto 22 SSRs are zero voltage switching, they are ideal for driving incandescent lamps because the initial inrush current into a cold filament is reduced. The life of the lamp is increased when switched by a zero voltage turn on SSR. The following table is a guide to selecting an Opto 22 SSR for switching a given incandescent lamp.
120 Volt Lamps SSR CURRENT RATING 2-Amp 4-Amp 10-Amp 25-Amp 45-Amp 240 Volt Rating SSR CURRENT RATING 2-Amp 4-Amp 10-Amp 25-Amp 45-Amp LAMP RATING 200 Watt 800 Watt 2 Kilowatt 4 Kilowatt 6 Kilowatt LAMP RATING 100 Watt 400 Watt 1 Kilowatt 2 Kilowatt 3 Kilowatt
Care should be taken in selecting a SSR for driving a heater load if the load is cycled on and off in a continuous manner as might occur in a temperature control application. Constant cycling can cause thermal fatigue in the thyristor chip at the point where the chip bonds to the lead frame. Opto 22 employs a thick copper lead frame for mounting the SCR chips in the power series SSRs to eliminate thermal fatigue failures. In addition, Opto 22 recommends operating any SSR at 75% rated current for cycling heater loads to ensure complete reliability. The following table is a guide to selecting the proper SSR for a given heater load.
Maximum Recommended Heater Current 11/2-Amp 21/2-Amp 71/2-Amp 18-Amp 35-Amp 8-Amp 8-Amp
Nominal SSR Current Rating 2-Amp 4-Amp 10-Amp 25-Amp 45-Amp 10 480V 10 480V
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
DATA SHEET
Form 859-990514
SOLID-STATE RELAYS
page 12/12
Applications
Tips (Continued)
Single-Phase Reversing Motor Control
The circuit diagram illustrates a typical 1 O motor winding inductance and the phase shift capacitor can cause twice line voltage to appear across the open SSR. A 240-volt SSR should be used for a 120-Volt line. During the transition period when one SSR is turned on and the other SSR is going off, both SSRs may be on. In this case, the capacitor may discharge through the two SSRs, causing large currents to flow, which may destroy the SSRs. The addition of RL as shown will protect the SSRs from the short circuit capacitor discharge current. CALCULATE RL as: RL = 1.4 EAC 10 x SSR full load rating The resistors are unnecessary if the control circuit is designed to ensure one SSR is off before the other SSR is on.
EXAMPLE: 10 amp SSR 120 V AC Line RL = 1.4 x 120 10 x 10 = 1.7 ohm
Three-Phase Motor Control
Three-Phase Reversing Motor Control
Three-phase motors may be controlled by solid-state relays as shown. A third SSR as shown is optional, but not necessary. The control windings may be connected in series or parallel. Care should be taken to ensure that surge current drawn by the motor does not exceed surge current rating of the SSR.
240-Volt 3 Motors SSR MODEL Z240D25 Z240D10 240D10 240A10 240D25 240A25 240D45 MOTOR 1/3 HP 3/4 HP 3/4 HP 3/4 HP 2 HP 2 HP 3 HP
Three-phase reversing motor control can be implemented with four SSRs as shown in the connection diagram. The SSRs work in pairs with SSR1 and SSR3 operated for rotation in one direction and SSR2 and SSR4 operated for rotation in the reverse direction. The resistor R1 as shown in the connection diagram protects against line-to-line shorts if SSR1 and SSR4 or SSR3 and SSR2 are on at the same time during the reversing transition period. Use the following table as a guide to the proper selection of an SSR for this application.
Opto 22 Relay 3-Amp 10-Amp 25-Amp 45-Amp 15-Amp Motor Full Load Rating 1.25-Amp 5-Amp 8-Amp 16-Amp 5-Amp Resistor for 120V line 4 ohm 50 W 1 ohm 100 W .5 ohm 100 W .25 ohm 150 W 1 ohm 100 W Resistor for 240V line 8 ohm 50 W 2 ohm 100 W 1 ohm 100 W .5 ohm 150 W 2 ohm 100 W
480-Volt 3 Motors SSR MODEL 480D10-12 480D15-12 MOTOR 1-1/2 HP 1-1/2 HP
Opto 22 * 43044 Business Park Drive * Temecula, CA 92590 * Phone: (909)695-3000 * (800)321-OPTO * Fax: (909)695-3095 * Internet: www.opto22.com
Inside Sales: (800)452-OPTO * Product Support: (800)TEK-OPTO * (909)695-3080 * Fax: (909)695-3017 * E-mail: support@opto22.com * FaxBack: (800)474-OPTO
All products and/or company names throughout this datasheet are generally trademarks or registered trademarks of their respective companies.

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