Scientific Solutions ® Inc.

SSR Solid State Relay Modules

Digital I/O signals from the computer are typically TTL type of signals. This means that they are 5v logic and can typically source/sink current in the 15 to 64ma range. If you need to control or sense higher voltage signals (example 60v DC or 120v/240v AC) and/or higher current signals (example 3 Amps instead of 64ma), then a solution could be to use Solid-State-Relays (SSR).

Our Solid State Relays are implemented as pluggable modules that can be installed into a "Solid State Relay Rack". The SSR modules provide a convenient method for interfacing real world signals to the computer interface. The modules come in 4 flavors (which are also made in different colors to help distinguish them)

The OUTPUT modules are used to switch AC or DC loads such as lights, motors, solenoids. The 5v logic signal from the computer controls the SSR, which in turn switches the DC / AC load ON or OFF.

The INPUT modules are used to "sense" AC or DC loads - meaning that they are used to monitor the Loads to determine when an AC or DC signal is present (on, conducting current).

All of the modules have optical isolation circuits that provide a 4000 volt optically isolated barrier between the computer electronics and the Load devices that are being controlled.

Module Size: Standard versus Mini

The Modules also come in two different sizes: Standard or Mini. The Standard size was the first size introduced a number of years ago. The Mini size is a newer physically smaller version (saves 35% space). The use of the Mini size allows you to have more Modules in a smaller area. The Relay Racks for the Mini are much smaller than they are for the Standard

Standard Module Dimensions: 1.70" long x 1.25" high x 0.60" wide (43.2mm x 31.8mm x 15.2mm)
Mini Module Dimensions: 1.70" long x 1.00" high x 0.40" wide (43.2mm x 25.4mm x 10.2mm)

Relay Rack size comparison

Size comparison of Standard and Mini Relay Racks
Upper Left: 24 Position Mini Relay Rack (8" x 6" / 203mm x 152mm)
Upper Right: Two 8 Position Standard Relay Racks (ea. 8" x 3.5" / 203mm x 89mm)
Bottom: 24 Position Standard Relay Rack (18.75" x 4.5" / 476mm x 114mm)

Output Modules

The AC OUTPUT modules have zero-crossing detection circuitry that ensure that the AC signal is only switched ON or OFF during the zero volt crossing of the AC signal. This is desirable as it greatly reduces generated Electrical Magnetic Interference (EMI) and Radio Frequency Interference (RFI) that are sources of noise. These modules are also highly immune to electrical transients and have built in RC snubber networks for increased capability with inductive loads.  Non-zero crossing modules are also available as an option for those applications that would rather have the EMI/RFI effects but have faster switching times

The DC OUTPUT modules can operate DC loads over a wide voltage range (typically 3 Vdc to 60 Vdc or 4 Vdc to 200 Vdc) and have built in spike protection. The 60 Vdc versions are the most common and offer the faster switching times.

Input Modules

The INPUT modules are used to monitor the status of and AC or DC loads. For example, you would use these type of modules to determine if a voltage is present such as from a temperature or pressure switch, limit switch or switch toggled manually.

Specifications

The following tables show a picture of both the "Standard" and "Mini" Modules in addition to providing a summary of the specifications.

arrow Technical Specifications

SSR DC Output specifications
SSR DC Output
SSR DC 60v Output Mini SSR DC 60v Output Standard SSR DC 200v Output Mini SSR DC 200v Output Standard
Part Number 381010 381006 381021 381017
Package Type Mini Standard Mini Standard
Output Specifications
Normal State Normally OPEN Normally OPEN Normally OPEN Normally OPEN
Maximum Load Voltage Vdc 60 60 200 200
Load Voltage Range Vdc 3 to 60 3 to 60 4 to 200 4 to 200
Max. On State Voltage Drop Vdc 1.20 1.20 1.20 1.20
Load Current Range @ 25º C Amp 0.02 to 3.0 0.02 to 3.5 0.02 to 3.0 0.02 to 3.5
Surge Current max. for 1 Sec. A 5 5 5 5
Derating (mA per ºC 33 Above 25º C 33 Above 25º C 33 Above 25º C 33 Above 25º C
Max. Off-state Leakage @ 60Vdc Load mA 1.5 1.5 0.01 0.01
Maximum Turn-on Time usec 20 20 75 75
Maximum Turn-off Time usec 50 50 750 750
Clamping Voltage (maximum) Vdc 80 80 360 360
Input Specifications
Nominal Logic Voltage Vdc 5 5 5 5
Logic Voltage Range Vdc 2.5 to 10 2.5 to 10 2.5 to 9 2.5 to 9
Typ. Logic Supply Current @ Nominal VCC mA 10 10 10 10
Max. Logic Supply Current @ Nominal VCC mA 14 14 18 18
Maximum Reverse Logic Voltage Vdc -5 -5 -5 -5
Nominal Logic Input Resistance Rx Ohm 300 300 220 220
Min. Logic Drop Out Voltage Vdc 1 1 1 1
General Specifications
Isolation Voltage Vrms 4000 4000 4000 4000
Typ. Power Dissipation Watt/Amp 1.0 1.0 1.5 1.5
Input to Output Capacitance (typical) pF 10 10 10 10
Vibration1 see notes below 20 G's peak or 0.06" double amplitude 20 G's peak or 0.06" double amplitude 20 G's peak or 0.06" double amplitude 20 G's peak or 0.06" double amplitude
Mechanical Shock2 see notes below 1500 G's 0.5mS half-sine 1500 G's 0.5mS half-sine 1500 G's 0.5mS half-sine 1500 G's 0.5mS half-sine
Storage Temperature º C -40 to +125 -40 to +125 -40 to +125 -40 to +125
Operating Temperature º C -40 C to +100 C -40 C to +100 C -40 C to +100 C -40 C to +100 C
Transient Power Dissipation 400 Watts at 1mS
(non-Recurring)
400 Watts at 1mS
(non-Recurring)
400 Watts at 1mS
(non-Recurring)
400 Watts at 1mS
(non-Recurring)
Package Size in (mm) 1.7 x 1.00 x 0.40
(43.2 x 25.4 x 10.2)
1.7 x 1.25 x 0.60
(43.2 x 31.8 x 15.2)
1.7 x 1.00 x 0.40
(43.2 x 25.4 x 10.2)
1.7 x 1.25 x 0.60
(43.2 x 31.8 x 15.2)
Package Color RED RED RED RED

SSR AC Output specifications
SSR AC Output
SSR AC 120v Output Mini SSR AC 120v Output Standard SSR AC 240v Output Mini SSR AC 240v Output Standard
Part Number 381009 381005 381020 381016
Package Type Mini Standard Mini Standard
Output Specifications
Normal State Normally OPEN Normally OPEN Normally OPEN Normally OPEN
Turn On State Zero-Crossing Turn On Zero-Crossing Turn On Zero-Crossing Turn On Zero-Crossing Turn On
Nominal Load Voltage Vac 120 120 240 240
Load Voltage Range Vac 24 to 140 24 to 140 24 to 280 24 to 280
Max. On State Voltage Drop Vac, max 1.50 1.50 1.50 1.50
Frequency Range Hz 25 to 70 25 to 70 25 to 70 25 to 70
Load Current Range @ 25º C Amp 0.02 to 3.0 0.02 to 3.5 0.02 to 3.0 0.02 to 3.5
Surge Current max. for 1 Sec. A 5 5 5 5
Derating (mA per ºC 33 Above 25º C 33 Above 25º C 33 Above 25º C 33 Above 25º C
Max. Off-state Leakage @ 60Vdc Load mA 1.5 1.5 0.01 0.01
Maximum Turn-on Time usec 20 20 75 75
Maximum Turn-off Time usec 50 50 750 750
Clamping Voltage (maximum) Vdc 80 80 360 360
Input Specifications
Nominal Logic Voltage Vdc 5 5 5 5
Logic Voltage Range Vdc 2.5 to 10 2.5 to 10 2.5 to 9 2.5 to 9
Typ. Logic Supply Current @ Nominal VCC mA 10 10 10 10
Max. Logic Supply Current @ Nominal VCC mA 14 14 18 18
Maximum Reverse Logic Voltage Vdc -5 -5 -5 -5
Nominal Logic Input Resistance Rx Ohm 300 300 220 220
Min. Logic Drop Out Voltage Vdc 1 1 1 1
General Specifications
Isolation Voltage Vrms 4000 4000 4000 4000
Typ. Power Dissipation Watt/Amp 1.0 1.0 1.5 1.5
Input to Output Capacitance (typical) pF 10 10 10 10
Vibration1 see notes below 20 G's peak or 0.06" double amplitude 20 G's peak or 0.06" double amplitude 20 G's peak or 0.06" double amplitude 20 G's peak or 0.06" double amplitude
Mechanical Shock2 see notes below 1500 G's 0.5mS half-sine 1500 G's 0.5mS half-sine 1500 G's 0.5mS half-sine 1500 G's 0.5mS half-sine
Storage Temperature º C -40 to +125 -40 to +125 -40 to +125 -40 to +125
Operating Temperature º C -40 C to +100 C -40 C to +100 C -40 C to +100 C -40 C to +100 C
Transient Power Dissipation 400 Watts at 1mS
(non-Recurring)
400 Watts at 1mS
(non-Recurring)
400 Watts at 1mS
(non-Recurring)
400 Watts at 1mS
(non-Recurring)
Package Size in (mm) 1.7 x 1.00 x 0.40
(43.2 x 25.4 x 10.2)
1.7 x 1.25 x 0.60
(43.2 x 31.8 x 15.2)
1.7 x 1.00 x 0.40
(43.2 x 25.4 x 10.2)
1.7 x 1.25 x 0.60
(43.2 x 31.8 x 15.2)
Package Color RED RED RED RED

1MIL-STD-202, Method 204, 20G. 10-2000Hz or IEC68-2-6, 0.15mm/sec2, 10-150Hz
2 MIL-STD-202, Method 213, Condition F, 1500G or IEC68-2-27, 11ms, 15g