Carlo Gavazzi RHS Heatsink Assemblies

Carlo Gavazzi RHS heatsinks are used to dissipate the heat generated from solid state relays. Generally made of aluminum, Carlo Gavazzi RHS heatsinks are fins of various shapes and sizes. The size of the heatsink is referencing its efficiency in heat conduction. Expressed in units of C°/W or Kelvin/W, the rate of heat conduction is proportional to the difference in temperature between the heat source and its surroundings. While in most instances a heatsink is required, each application must be examined to determine the nature of the heatsinking. In some applications, only the metal back plate is required, while in others, a large finned heatsink with or without forced cooling is required. The higher the load current and the higher the ambient temperature, the larger the heatsink (lower the thermal resistance).

In choosing a Carlo Gavazzi RHS heatsinks, there are 2 parameters of your application you need to know:

1. Actual current of your load
2. The worse case estimate of the ambient temperature of where your relay will be located

Using the following thermal charts, determine the thermal resistance value required for the SSR being used. Now select a Carlo Gavazzi RHS heatsink that has that rating or better (better would be a heat sink with a smaller thermal resistance value, less resistance equals a larger heat sink capable of dissipating more heat):

• Carlo Gavazzi RAM1A/RAM1B SSR Chart on Page 4
• Carlo Gavazzi RM1A/RM1B SSR Chart on Page 4
• Carlo Gavazzi RM1C SSR Chart on Page 3
• Carlo Gavazzi RM1E SSR Chart on Page 3

Carlo Gavazzi RHS Heatsink Models Available

• Carlo Gavazzi RHS100 Heatsink:

  3.0 K/W heatsink assembly with DIN-rail adapter for 1-phase SSRs. The units dimensions are 82 x 45 x 49mm. Model RHS100 is a complete heatsink kit not including the SSR.

• Carlo Gavazzi RHS301 Heatsink:

  0.8 K/W heatsink assembly for 1-phase and 3-phase SSRs. The dimensions of ther unit are 122 x 118 x 82mm.

• Carlo Gavazzi RH45B Heatsink:

  2.0 K/W heatsink assembly with DIN-rail adapter for 1-phase SSRs. The dimensions of the unit are 109 x 103 x 45mm. Model RHS45B is a complete heatsink kit not including the SSR. A 40 x 40mm fan may be mounted on the heatsink.

Contact Instrumart for other heatsink options. We also have a complete family of relays with built-in heatsinks that can be DIN-rail or chassis mounted.