HS201DR-D2450 datasheet, PDF - EEWORLD Datasheet

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HS201DR-D2450: DescriptionSSR RELAY SPST-NO 35A 24-280V; CategoryTopical application Mechanical and electrical/engineering/automation; File Size2MB，37 Pages; ManufacturerSensata; Environmental Compliance

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HS201DR-D2450 Overview

SSR RELAY SPST-NO 35A 24-280V

HS201DR-D2450 Parametric

Parameter Name	Attribute value
Installation type	DIN rail
circuit	SPST-NO（1 Form A）
Output type	AC, zero crossing
Voltage - input	3 ~ 32VDC
Voltage - Load	24V ~ 280V
Load current	35A
Terminal type	screw terminal
Package/casing	Ice puck package with heat sink
Supplier device packaging	-

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Heat Sinks & SSR Assemblies

The Global Expert in

Solid State Switching

Technology

Heat Sinks

Heat Sink Selection

Why Heat Sinks are required for reliable Solid State

Relay operation?

Heat Sinks

are required to insure the proper operation and long term reliability of Solid

State Relays because they provide a means to dissipate the power that is normally

developed internally in the SSR into the surrounding ambient air and maintain a safe

operating temperature.

All SSRs in their conduction state create thermal energy in the output semiconductor

at the rate of approximately 1 to 1.5 watts per ampere of load current for AC output

SSRs, and 0.2 to 1.5 watts per ampere of load current for DC output SSRs depending

upon their design. This power dissipation raises the Solid State Relay’s operating

temperature above the surrounding ambient.

Solid State Relays can operate reliably without heat sinks up to approximately 5 Amps

of load current depending upon model, duty cycle and ambient temperature. Free air

ratings of traditional panel mount SSRs may be as high as 8 to 10 Amps, but this rating

relies on the SSRs exposed metal base plate acting as a heat sink, meaning that it must

be exposed to ambient air.

Heat Sinks

are made of high thermal conductive material such as aluminum. Not

only is aluminum’s thermal conductivity high, its cost is relatively low. Although

other materials such as steel may provide a limited measure of heat sinking, thermal

conductivity of these materials are relatively low compared to aluminum and therefore

far less effective as a

Heat Sink.

Coatings also tend to diminish the thermal dissipation

effectiveness of most materials and except anodizing, should be avoided.

Heat Sink

performance is rated by

thermal impedance,

measured in °C per watt

(°C/W) (thermal impedance is the inverse of thermal conductivity). Thermal impedance

represents the resistance to the transfer of thermal energy, therefore lower numerical

thermal impedance ratings mean more efficient heat transfer.

Thermal Impedance ratings of

Heat Sinks

are based upon natural convection air flow.

To achieve this performance, the

Heat Sink

must be oriented such that air flow over its

finned surface is maximized. Generally this means the fins should be oriented vertically.

Significant improvement in

Heat Sink

performance can be achieved by providing forced

air flow over the

Heat Sink’s

surface area. Fans delivering relatively small volumes of

air can reduce the Heat Sink’s thermal impedance substantially, thereby improving its

efficiency and consequently the SSRs reliability.

Heat Sinks

Accessories

Assemblies

•

Selecting a Heat Sink for a given Solid State Relay

Application

Crydom offers technical assistance selecting a heat sink for any given SSR application

through its Applications Engineering Department and on its website. Available “White

Papers” and a selection “tool” to calculate a heat sink rating based upon load current and

ambient temperature are available at

www.crydom.com.

How to calculate and select a Heat Sink for a given

Solid State Relay application

The basic structure of a Solid State Relay includes an internal power semiconductor

mounted to an electrical insulator which in turn is mounted to the Solid State Relay’s

base plate. To form an assembly, the SSR with an accompanying thermal interface

material placed on its base plate is then torque mounted to the

Heat Sink.

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