How does a Solid State Relay work?

For many years, the main device for controlling power was to use a contactor. This has gradually changed, and there has been wide acceptance of the use of solid state devices, whether they are solid state relays or power controllers.

Since its introduction, the SSR technology has gained acceptance in many areas that had previously been the sole domain of the EMR or the Contactor. The major growth areas have come from Industrial Process Control applications; particularly heat/cool temperature control, motors, lamps, solenoids, valves and transformers. The list of applications for the SSR is almost limitless.

The following are typical examples of SSR applications: industrial automation, electronic appliances, industrial appliances, packaging machines, tooling machines, manufacturing equipment, food equipment, security systems, industrial lighting, fire and security systems, dispensing machines, production equipment, on-board power control, traffic control, instrumentation systems, vending machines, test systems, office machines, medical equipment, display lighting, elevator control, metrology equipment, and entertainment lighting.

Pyrosales offers both standard SSRs that can be attached to a heatsink, or a range of slimline SSRs that have an integral heatsink, and can be din-rail mounted where space is an issue.

 

Advantages of using SSRs

When used correctly in the intended application, the SSR provides many of the characteristics that are often difficult to find in the EMR: a high degree of reliability, long service life, significantly reduced electromagnetic interference, fast response, and high vibration resistance are significant benefits of the SSR. The SSR has no moving parts to wear out or arcing contacts to deteriorate, which are often the primary cause of failure with an EMR.

• Long life (reliability) > 109 operations
• Zero voltage turn on, low EMI / RFI
• Shock and vibration resistant
• Random turn-on, proportional control
• No contact bounce
• Arcless switching
• No acoustical noise
• Microprocessor compatible
• Fast response
• No moving parts

SELECTION GUIDE FOR STANDARD SSR

Example:                 SSR – 40 D A – H
                                    1      2  3  4    5

  1       PRODUCT

SSR = Solid State Relay

2       OUTPUT CURRENT

05 = 5A
10 = 10A
25 = 25A
40 = 40A

3       INPUT VOLTAGE

D = DC 3 ~ 32V
A = AC 80 ~ 250V
V = Trimmer Pot

4       OUTPUT VOLTAGE
D = DC 5 ~ 60V
A = AC 24 ~ 380V or AC 90 ~ 480V

5       OUTPUT VOLTAGE RANGE
H = High Voltage Type < AC 90 ~ 480V >
No Value = Standard Type < AC 24 ~ 380V >

 

SSR SERIES – DC TO AC SOLID STATE RELAY

Specification

Type	Terminal Type					PCB Type
Model	SSR – 10DA	SSR – 25DA	SSR – 40DA	SSR-25DA-H	SSR-40DA-H	SSR-P03DA
Rated Load Current	10A	25A	40A	25A	40A	3A
Input Data
Operating Voltage	3 ~ 32VDC
Min. ON / OFF Voltage	ON > 2.4V , OFF < 1.0V
Trigger Current	7.5mA / 12V
Control Method	Zero Cross Trigger
Output Data
Operating Voltage	24 ~ 380VAC			90 ~ 480VAC		24 ~ 480VAC
Min. Black Voltage	600 VAC < Repetive >
Voltage Drop	1.6 V / 25 C
Max. Durated Current	135A	275A	410A	275A	410A	135A
Leakage Current	3.0mA	3.0mA	3.0mA	5.0mA	5.0mA	3.0mA
Response Time	ON < 10ms , OFF < 10ms
General Data
Dielectric Strength	Over 2.5KVAC / 1min
Isolation Strength	Over 50MΩ / 500VDC
Operating Temperature	-20 C ~ + 80 C
Housing Material	Intensive ABS
Weight	Appr. 105g					Appr. 15g
Connection Diagram

 

SSR SERIES – AC TO AC SOLID STATE RELAY

Specification

Type	Terminal Type
Model	SSR – 10AA		SSR – 25AA		SSR – 40AA		SSR-25AA-H		SSR-40AA-H
Rated Load Current	10A		25A		40A		25A		40A
Input Data
Operating Voltage	80 ~ 250VAC
Min. ON / OFF Voltage	ON > 45V , OFF < 35V
Trigger Current	5.0mA / 110VAC
Control Method	Zero Cross Trigger
Output Data
Operating Voltage	24   Ì´  380VAC					90   Ì´  480VAC
Min. Black Voltage	600 VAC < Repetive >
Voltage Drop	1.6 V / 25 C
Response Time	ON < 20ms , OFF < 20ms
Max. Durated Current	135A	275A		410A		275A		410A
Leakage Current	3.0mA	5.0mA		3.0mA		5.0mA		5.0mA
General Data
Dielectric Strength	Over 2.5KVAC / 1min
Isolation Strength	Over 50MΩ / 500VDC
Operating Temperature	-20 C ~+ 80 C
Housing Material	Intensive ABS
Weight	Appr. 110g
Connection Diagram

 

SSR SERIES – ADJUSTABLE SOLID STATE RELAY

Specification

Type	Terminal Type
Model	SSR – 10VA	SSR – 25VA	SSR – 40VA
Rated Load Current	10A	25A	40A
Input Data
Variable Resistance	Trimmer / 250kΩ to 110V , 500kΩ to 220V
Control Method	Phase Control
Output Data
Operating Voltage	24 ~ 380VAC
Min. Black Voltage	600 VAC < Repetive >
Voltage Drop	1.6 V / 25 C
Max. Durated Current	135A	275A	410A
Leakage Current	5.0mA	5.0mA	5.0mA
General Data
Dielectric Strength	Over 2.5KVAC / 1min
Isolation Strength	Over 50MΩ / 500VDC
Operating Temperature	-20 C ~+ 80 C
Housing Material	Intensive PBT
Weight	Appr. 105g
Connection Diagram
Adjustable SSR VR : 250KVΩ/110VAC, 500KΩ/220VAC

 

 

Dimension < Heat Sink > 

Standard Type

 

H Type

MODEL LENGTH (L) mm CURRENT DURATION PCS OF SSR HS-50H 50.0 10A MAX. SINGLE HS-100H 100.0 25A MAX. TWICE HS-150H 150.0 40A MAX. THREE HS-200H 200.0 – FOUR

 

 

 

Dimensions for single phase solid state relays

 

Characteristics Curves

Characteristics Curves

 

 

 

Slimline Din-Rail Mount SSR

 

Specifications

Maximum Load Current	15A AC, 25A AC
Minimum Load Current	100mA AC
Peak 1 Cycle Surge Current	15A AC : 150A (50Hz) 25A AC : 250A (50Hz)
Input Signal	Voltage pulse input (DC), LOW (OFF): 0V HIGH (ON): 4.5 to 30V
Input Impedance	450 to 3.0kΩ (Built-in constant current circuit 10mA)
Response Time	0.5 cycle or less
Input Protection	Protection of reverse polarity connection
Output Protection	CR protection circuit and Varistor
Output ON Voltage Drop	Less than 1.0V (200V AC)
Load Voltage	50 to 264V AC
Insulation Resistance	More than 100MΩ (500V DC)
Dielectric Strength	2500V AC (one minute)
OFF State Leakage Current	Less than 9mA (240V AC)
Induration Method	Phototriac
Net Weight	Approx. 220g

 

Temperature characteristics of Load Current