Omega Products BS-101 User Manual

Solid State Relays

High Reliability, Vdc Input/ Vac Output, Vac Input/Vac Output

SSRL240AC10

SSRL Series

shown actual size.

U Current Ratings to 100 A U Multi-Million Cycle Life U Compatible with

Temperature Controllers

U Solid-State, SCR Design U Zero Voltage Switching U Control AC Lines

to 660 Vac

U AC and DC Control

Signal Models

U LED Input Status Indicator U Thermal Conductive

Pad Included

The SSRL Series solid state relays are used to control large resistance heaters in conjunction with temperature controllers. Solid state relays are SPST, normally open switching devices with no moving parts, capable of millions of cycles of operation. By applying a control signal, an SSR switches “on” the AC load current, just as the moving contacts do on a mechanical contactor. Three-phase loads can be controlled using 2 or 3 SSR’s. Use 3 SSR’s for “Y” or “star” 3-phase loads using a neutral line. Two SSR’s will control “delta” loads with no neutral line. Three solid state relays are also used when there is no neutral load to provide redundancy and extra assurance of control.

“Switching” takes place at the 0 voltage crossover point of the alternating current cycle. Because of this, no appreciable electrical noise is generated, making SSR’s ideal for environments where there are apparatuses susceptible to RFI.

AC output SSR used with temperature controller with DC voltage SSR driver output

Temperature

Controller

Vac

AC output SSR used with temperature controller with mechanical relay output

Temperature

Controller

Vac

AC output SSR used with temperature controller with triac output

Temperature

Controller

Vac

Control Side

0 or 5 Vdc, Typically

Control Side

Vac

Driving

SSR

Control Side Load Resistor

Vac

Driving

SSR

DC Input SSR

AC Input SSR

Load Side

Heater

Fast Blow

Fuse

Heater

Fast Blow

Fuse

Heater

Fast Blow

Fuse

Vac

Typical Applications

Common Specifications

Operating Temperature: -20 to 80°C

(-5 to 175°F)

Storage Temperature: -40 to 80°C

Capacitance: 8 pF, input to output (max) Line Frequency Range: 47 to 63 Hz Turn-On Time: 20 ms, AC; 05 cycle, DC Turn-Off Time: 30 ms, AC; 05 cycle, DC

(-40 to 175°F) Isolation: 4000 Vrms, input to output;

2500 Vrms input/output to ground

Output Specifications for Vac and Vdc Input Models Speciﬁcations 10 Amp 25 Amp 50 Amp 75 Amp 100 Amp

Max On-State Current 10 A 25 A 50 A 75 A 100 A Min On-State Current 100 mA Max 1-Cycle Surge 150 A 300 A 750 A 1000 A 1200 A Max 1 sec Surge 30 A 75 A 150 A 225 A 300 A

12T (60 Hz), A2sec 416 937 2458 5000 6000

P-111

These SSR’s are of the twin SCR type, inherently

50.8 (2.000) 4.241 (0.167)

5.08

(0.200)

1.5748 (0.062)

112.17 (4.416)

6.35

(0.250)

47.625 (1.875)

A B

120.65 (4.750)

3.175

(0.125)

8-32 TH'D

2 Places

50.8

(2.000)

more reliable and capable of higher overloads before failure than triacs. Heat is developed in a solid state relay due to the nominal voltage drop across the switching device. To dissipate the heat, an SSR must be mounted on a ﬁnned heat sink or aluminum plate. An SSR should be located where the ambient temperature is relatively low, since the current switching rating is lowered as the temperature increases. Another SSR characteristic is a small leakage current across the output when the relay is open. Because of this, a voltage will always exist on the load side of the device

In comparing SSR’s with mechanical contactors, the SSR has a cycle life many times that of a comparably priced contactor. However, SSR’s are more prone to failure due to overload and improper initial wiring. Solid state relays can fail, contact closed, on overload circuits. It is essential that a properly rated, fast blowing I

T fuse be installed to protect the load circuit

Finned heat sinks are anodized fabrications that come complete with tapped mounting holes and screws. See thermal rating curves and ordering instructions for proper selection.

All SSRL series relays come with a thermally conductive pad mounted on the baseplate. This will signiﬁcantly improve the thermal conductivity between the heat sink and SSR baseplate. It is also suggested that 10"/lb of torque be used on the SSR mounting screws.

FHS-1 and FHS-2 Heat Sink

Dimensions: mm (inch)

SSRL240DC50 solid state relay shown smaller than actual size with FHS-2 heat sink. See P-114 for more information.

FHS Heat Sink Dimensions and Specifications

FHS-6 Heat Sink

SSR MOUNTING HOLES (2) 8-32 THDS.

66.5

(2.62)

120.7 (4.75)

Dimensions: mm (in)

139.7 (5.50)

114.3 (4.50)

12.7 (0.50)

115.8 (4.56)

CENTERS

(SCREWS)

SSR240 Series Electrical Specifications

Input-Control Signal Output Control Control Control Max Peak

Signal Signal Signal Input Voltage* Model No. Type Voltage Turn-On Turn-Off Current (60 s Max)

SSRL240AC10 SSRL240AC25 AC

SSRL240AC50 control 90 to 280 Vac 90 Vac 10 Vac 10 mA 800V SSRL240AC75 signal SSRL240AC100

SSRL240DC10 SSRL240DC25 DC

SSRL240DC50 control 3 to 32 Vdc 3 Vdc 1 Vdc 14 mA 800V SSRL240DC75 signal SSRL240DC100

SSRL660AC50 AC SSRL660AC75 control 90 to 280 Vac 90 Vac 10 Vac 10 mA 1200V SSRL660AC100 signal

SSRL660DC50 DC SSRL660DC75 control 4 to 32 Vdc 4 Vdc 1 Vdc 14 mA 1200V SSRL660DC100 signal

Transients above table value should be suppressed.

36.6

(1.44)

END VIEW

Model No. A B C Thermal Rating

5.6 (0.22)

(TYP.)

5.1

(0.20) (TYP.)

47.5 (1.87)

TOP VIEW

FHS-1 3.00" 2.50" 0.56" 2°C/W FHS-2 5.50" 5.00" 1.81" 1.2°C/W

P-112

46.0

(1.81)

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