HBControls Solid State Relay Assemblies

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HBControls has developed a family of solid state relay and heat sink assemblies which virtually eliminate the need for any thermal engineering on the part of the design engineer. The assemblies include a convenient DIN rail mounting configuration, finger-safe covers and utilize the highest quality relays available. All of the relays used in the assemblies have received UL, CSA, VDE and CE certification.

	S Series - SSR DIN Rail Mount 0.04 to 25 Amps AC @ 40°C Ambient		Dual SSR DIN Rail Mount to 40 Amps AC @ 40°C Ambient
	SSR DIN Rail Mount to 10 Amps @ 30°C Ambient		SSR DIN Rail Mount to 60 Amps @ 40°C Ambient
	SSR DIN Rail Mount to 40 Amps AC @ 40°C Ambient		Stripped Wire Connection SSR DIN Rail Mount to 40 Amps AC @ 40°C Ambient
	SCR Power Controller (On/Off) Single Phase to 40 Amps AC @ 40°C Ambient		DIN Rail Mount to 50 Amps @ 40°C Ambient
	SCR Power Controller Phase Angle 10-40 Amps AC @ 40°C Ambient		Current Transducers AC Current to DC Voltage
	DIN Rail Mount - 3 Phase to 40 Amps AC @ 40°C Ambient

We are frequently asked to recommend our solid-state relay assembly in replacement of a mercury or electromechanical relay or contactor. Often the only application information provided is the contact rating of the relay currently being used, while this information is helpful it is incomplete. It is imperative that the actual load being controlled, and the ambient operating temperature is known when applying a solid-state relay.

Solid-state relays, unlike mercury or electromechanical relays, do not have moving parts which wear out due to mechanical wear over a finite number of operations, theoretically, when properly applied, they infinite life. It is important therefore, that in addition to the current and voltage all characteristics of the load are considered. Is the load resistive or inductive, AC or DC, three phase or single phase. If three phase, are all three or only two legs being controlled, is the circuit Delta or Y? A major enemy of the solid-state relay and often the cause of premature failure is heat, when the relay is switching a load it is generating an amount of heat proportional to the wattage of that load.

When replacing a mercury or electromechanical relay with a solid state relay make sure that you have determined the actual load being switched as well as the ambient temperature of the environment in which the relay is being operated. Generally, if the load is greater than 10 amperes AC and the ambient temperature is greater than 20 degrees centigrade the relay must be mounted on an appropriately sized heat sink, or another method of directing heat away from the relay utilized. In the case of larger current loads, or a higher ambient temperature, both a heat sink and cooling fan may be required to direct heat away from the assembly.

HBControls engineers are well versed in the practice of determining the appropriate combination of solid-state relay and heat dissipating devices.