Contactors (Solid State)

Part Number	Description / PDF	Quantity
HAC60D150H Sensata Technologies – Crydom	RELAY SSR CONTACTOR AC 150A 32V	5
DR2260A20V Sensata Technologies – Crydom	RELAY SSR 600V 20A DIN RAIL	4
DP4RSA60E20B2 Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 20A 32V	0
DP4R60E40B Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 40A 32V	0
DP4RSB60D20 Sensata Technologies – Crydom	RELAY SSR CONTACTOR 20A 48V	0
DP4RSC60D20B8 Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 20A 15V	0
DRC3P48D400 Sensata Technologies – Crydom	480V 5A 24VAC/DC NO AUX ZC 3L	0
DP4R60D60B Sensata Technologies – Crydom	RELAY SSR CONTACTOR 60A 48V	3
DP4RSC60D60B8 Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 60A 15V	0
HDC200A120 Sensata Technologies – Crydom	RELAY SSR CONTACTOR DC 120A	0
HAC60B150H Sensata Technologies – Crydom	SOLID STATE RELAY 600 V	10
DP4RSC60E20B5 Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 20A 32V	0
DP4RSA60D40B2 Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 40A 15V	0
DP4RSB60D20B2 Sensata Technologies – Crydom	RELAY SSR CONTACT 48VDC 20A 15V	0
DP4R60E60 Sensata Technologies – Crydom	RELAY SSR CONTACTOR 60A 48V	7
DRC3R40B420 Sensata Technologies – Crydom	REV 400V 7.6A 120 VAC 2NO	0
CTRC6025 Sensata Technologies – Crydom	RELAY SSR CONTACT 3PH 25A 600VAC	9
DR2260A35VRJ Sensata Technologies – Crydom	RELAY SSR 600V 35A DIN RAIL	0
HDC60A120 Sensata Technologies – Crydom	RELAY SSR CONTACTOR DC 120A 140V	0
DR2260A35W Sensata Technologies – Crydom	RELAY SSR 600V 35A DIN RAIL	0

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)