Contactors (Solid State)

Part Number	Description / PDF	Quantity
DRA3P48A4R Sensata Technologies – Crydom	RELAY CONT 3PH 480VAC 4A 220VAC	0
RGC1A60D32KGE Carlo Gavazzi	SSR 600V 37A 1200VP-E-SRW IN	5
DR2260D20WRJ Sensata Technologies – Crydom	RELAY SSR 600V 20A DIN RAIL	0
DP4RSA60E60B Sensata Technologies – Crydom	RELAY SSR CONTACTOR 60A 48V	0
DP4R60E40B2 Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 40A 32V	0
DRC3P48A420R Sensata Technologies – Crydom	480V 5A 230VAC 2NO RN 3L	0
DRC3P48A4202 Sensata Technologies – Crydom	480V 7.6A 230VAC 2NO ZC 2L	0
DRA3P48D2R Sensata Technologies – Crydom	RELAY CONTACT 3PH 480VAC 2A 5V	0
RGC1A60D40KGE Carlo Gavazzi	RELAY SSR 32VDC 1PH 600V 40A	8
RGC1P48V42ED Carlo Gavazzi	SSR V IN PS 480V 43A 1200VP	2
REC2B48A40GKE Carlo Gavazzi	SSR 2P 2PH CONTACTOR 480VAC	5
DR2260A30WRJ Sensata Technologies – Crydom	RELAY SSR 600V 30A DIN RAIL	0
RGC1A23D25KKE Carlo Gavazzi	SSR ZC 230V 25A 800VP	8
DP4RSA60E60B8 Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 60A 32V	0
DR2260A30W Sensata Technologies – Crydom	RELAY SSR 600V 30A DIN RAIL	0
DRC3P48D433R Sensata Technologies – Crydom	CONTACTOR SSR 3PH 480V 5A DIN	0
DRC3P48A4002 Sensata Technologies – Crydom	480V 7.6A 230VAC NO AUX ZC 2L	0
DRC3P48B420R Sensata Technologies – Crydom	480V 5A 120VAC 2NO RN 3L	0
DRC3R40A420 Sensata Technologies – Crydom	REV 400V 7.6A 230 VAC 2NO	0
CTRD6025 Sensata Technologies – Crydom	RELAY SSR CONTACT 3PH 25A 600VAC	4

Contactors (Solid State)

Solid State Contactors (SSCs) are electronic switching devices that use semiconductor components (e.g., thyristors, triacs, or MOSFETs) to control electrical circuits without mechanical contacts. Unlike electromechanical relays, SSCs provide wear-free operation, faster switching speeds, and enhanced reliability. They play a critical role in modern industrial automation, energy management systems, and precision control applications where longevity and performance are paramount.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
AC Output Solid State Contactors	Use thyristors/triacs for zero-crossing switching, reducing electrical noise	Heating systems, motor control in HVAC
DC Output Solid State Contactors	Employ MOSFETs for high-speed DC circuit control	Solar inverters, battery management systems
Random Turn-on Contactors	Switch immediately upon signal input, regardless of voltage phase	Lighting control, phase angle regulation
Zero-crossing Contactors	Switch when AC voltage crosses zero to minimize transient spikes	Resistive heating loads, industrial ovens
Modular Solid State Relays	Compact plug-in designs for panel mounting	Factory automation lines, test equipment

3. Structure and Components

A typical solid state contactor consists of:

Housing: Flame-retardant polymer casing with IP20 protection rating
Semiconductor Switch: SCR (Silicon Controlled Rectifier) or TRIAC for AC control, MOSFETs for DC applications
Heat Sink: Aluminum finned structure for thermal dissipation (rated for 80 C ambient operation)
Control Circuit: Optocoupler isolation with LED indicator, typically operating at 3-32V DC
Terminal Blocks: Screw-type or spring-clamp connections for load and control circuits

4. Key Technical Specifications

Parameter	Typical Range	Importance
Rated Voltage	24-660V AC/DC	Determines circuit compatibility
Load Current	0.5-100A	Defines maximum power handling capacity
Switching Speed	0.5-20ms	Controls response time in dynamic applications
Operating Temperature	-25 C to +80 C	Specifies environmental tolerance range
Dielectric Strength	2500V RMS	Ensures electrical isolation safety
MTBF	100 million operations	Measures reliability and service life

5. Application Fields

Major industries utilizing solid state contactors include:

Industrial Automation: PLC systems, CNC machines, conveyor belts
Energy Management: Smart grids, solar power inverters, energy storage systems
Process Control: Temperature regulation in chemical reactors
Transportation: Electric vehicle charging stations, rail traction control
Consumer Electronics: High-end home appliances, smart thermostats

Case Study: In injection molding machines, solid state contactors enable precise temperature control ( 1 C) for heating barrels, improving production yield by 15% compared to electromechanical alternatives.

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Omron	G3PH-C-DC-24V	24V DC control, 40A load, DIN rail mount
Siemens	3RF2020-1AA00	0.5-10A range, LED status indicator
ABB	AF10-30MA	30mA control current, IP20 protection
Crydom	HL240D100	100A rating, 240V AC output
TE Connectivity	SS-4S-S-DC5V	5V DC input, 2A load capacity

7. Selection Guidelines

Load Type: Choose AC/DC-specific models with appropriate semiconductor technology
Current Rating: Select 20% higher capacity than maximum load requirements
Thermal Management: Consider heatsink requirements for continuous operation
Control Signal: Match input voltage to PLC/system control levels
Environmental Factors: Verify protection rating (IP), vibration resistance, and operating temperature
Certifications: Check for UL, CE, RoHS compliance for regulatory compliance

8. Industry Trends

Future developments include:

Integration with IoT for predictive maintenance capabilities
Adoption of wide bandgap semiconductors (SiC/GaN) for higher efficiency
Miniaturization through advanced thermal management materials
Increased adoption in EV charging infrastructure (expected CAGR 22% by 2028)
Standardization of digital interfaces (e.g., IO-Link compatibility)