Crouzet Solid State Relay Knowledge Base


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SSR Knowledge Base

A solid state relay, in comparison to a mechanical relay, is actually not a relay at all. There are no moving components inside to switch power to and from the load. This is managed by the SCR, triac, alternistor, or other semiconductor device in the output of the SSR. And although the primary function of switching power to and from an electrical load is the same, several significant advantages are gained by using a solid state relay instead of EMR's.

Benefits of Solid State Relays;

Long life; up-to 20x+ that of an EMR

High surge-current ratings

Quiet operation

No arcing or welding of contacts

High isolation voltage; typically >4Kv

However, there are also a few disadvantages to using solid state relays. Most notable is the heat dissipation, which is a characteristic of any semiconductor device (for more information, see the Knowledge Base section on solid state relays & thermal management. Also, solid state relays typically cost slightly more than equivalent electromechanical relays. However, given the life expectancy of solid state relays, they usually pay for themselves in a relatively short period of time.

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	Product Overview
	GN Solid State Relays
	DIN-Rail Solid State Relays
	Dual Solid State Relays
	Solid State Relay Assemblies
	Hybrid Solid State Relays
	Three-Phase Solid State Relays
	DC Solid State Relays
	PC Mount Solid State Relays
	SIMM Interface Relays

Knowledge Base Index

Knowledge Base Home

SSR Applications - Heating

SSR Applications - Motor Loads

SSR Applications - Lighting

Optocouplers & Noise Immunity

Transient Protection - TVS vs. MOV's

Snubber Networks

Heat Sinks & Thermal Management

GN SERIES SOLID STATE RELAYS
• AC Output Solid State Relays
• Ratings from 10 to 125 Amps
• DBC Substrate
• Built-In Transient Protection
• LED Input Status Indicator

COOLTECH DIN-RAIL SOLID STATE RELAYS
• No Heat Sink Calculations Required
• Epoxy-Free Design
• DIN-Rail or Panel Mount
• DBC Substrate
• Built-In Transient Protection
• LED Input Status Indicator
• Relay or Contactor Configuration

DUAL OUTPUT SOLID STATE RELAYS
• True 40A Per Channel Relays
• 240Vac or 600Vac Outputs
• Built-In Transient Protection
• 4-15Vdc or 17-32Vdc Inputs
• Optional Keyed/Locking Input Connector

SOLID STATE RELAY ASSEMBLIES
• DIN Rail Mount Heat Sink Assemblies
• No Heat Sink Calculations Required
• Standard Ratings up to 45A at 660Vac
• Internal Transient Protection
• LED Input Status Indicator

RHP HYBRID SOLID STATE RELAY
• 20A/240Vac Output (resistive)
• Compact 17.5mm Housing
• No Heat-Sink Required
• >5M Operations at Full Load
• UL/cUL Listed

THREE-PHASE SOLID STATE RELAYS
• 25A, & 50A Three-Phase Outputs
• 25A & 50A Motor-Reversing Outputs
• DBC Substrate
• Built-In Transient Protection
• Interlock Circuit (Motor-Reversing)
• LED Input Status Indicator

DC OUTPUT SOLID STATE RELAYS
• 10A, 15A, & 30A FET Outputs
• 10A / 60Vdc Transistor Output
• Low On-State Resistance (FET Relays)
• IP20 or IP00 Housing
• LED Input Status Indicator

PC MOUNT SOLID STATE RELAYS
• Up-To 25A at 480Vac Output
• SCR or Triac Output
• SIP or Flat-Pack
• 4Kv Optical Isolation
• UL Recognized / CE Complaint

SIMM INTERFACE RELAYS
• 6.2mm DIN Mount IP20 Housing
• Transistor, Triac, or EMR Outputs
• 6 Amp Form C Output Relay (EMR Output)
• LED Status Indicator

HEAT SINKS & ASSEMBLIES
• DIN or Panel Mount
• Standard Heat Sinks up-to 0.5°C/W
• One or Multiple Relays
• Custom Assemblies