Solid State Relay Rack Mounts

A Solid State Relay Rack is a circuit board that has positions to allow the plugging in of Solid State Relay (SSR) modules. SSR Modules are used to allow a +5v TTL Digital I/O signal to control or monitor AC 110v/220v or DC 60v/200v sources. The Relay Rack has a connector that allows connection of the Relay Rack to Digital I/O signals. The Relay Rack also has screw terminal "pairs" for each of the modules that allow easy connection to your AC voltage or DC voltage signals.

Relay Racks come in different versions to accommodate a different number of Modules. Typical racks accommodate 8, 16 or 24 Modules. Thus, you can select the Relay Rack that can hold the number of SSR Modules that you need.

Keep in mind that many times the Digital I/O from the computer is programmable as INPUT or OUTPUT in 8-bit sections. This means that if you have an 8 position Relay Rack, then it will have either all INPUT or all OUTPUT type of modules. Thus, if you need both INPUT and OUTPUT modules, you would need two 8 position Relay Racks or a rack with more positions such as a 24 position rack.

There are also two types of Relay Racks based upon the size of SSR modules you want to use. One type is used for "Standard" size modules, while the other type is used for "Mini" size modules. Standard and Mini type of SSR Modules are much different in size. A Relay Rack designed for "Standard" size SSR modules cannot use the "Mini" size modules and vice-versa.

Relay Racks have a connector that is used to cable between the Relay Rack and the Digital I/O signals. Typically this connector is a 50 position pin header made up of two rows of 25 pins with one row the Digital I/O signals and the other row ground. If your Digital I/O equipment has a single 50 position header with 8 Digital I/O signals, then using a single 8 position Relay Rack is not a problem. However, if you have 16 or 24 Digital I/O signals on a single 50 position header, then it may be easier to use a Relay Rack with 16 or 24 module positions. If, for example, you want to use two of the 8 position Relay Racks to pick up 16 Digital I/O from a single 50 position Digital I/O header then it gets a little more complicated as to how to wire up from the single Digital I/O header to the two Relay Rack headers.

The Relay Racks and Solid State Modules are normally used with Scientific Solutions BaseBoard / PCI product. On the front of the BaseBoard / PCI are four connections, with each connector providing 24 Digital I/O signals. Each connection can connect to a single Relay Rack. So if you wanted to use two of the 8-position racks, you could use two of the connections on the front of the BaseBoard / PCI. The 24 position rack would connect to one of the BaseBoard / PCI front-panel connectors.

Solid State Relay Rack, 8 Position for Standard size relays

Module

TITLE Solid State Relay Rack, 8 Position for Standard size relays
PART NUMBER 381013

  • SSR Module Positions: 8
  • Module Size Supported: Standard
  • Rack Size: 8" x 3.5" (203mm x 89mm)

Solid State Relay Rack, 24 Position for Standard size relays

Module

TITLE Solid State Relay Rack, 24 Position for Standard size relays
PART NUMBER 381014

  • SSR Module Positions: 24
  • Module Size Supported: Standard
  • Rack Size: 18.75" x 4.5" (476.3mm x 114.3mm)

Solid State Relay Rack, 24 Position for Mini size relays

Module

TITLE Solid State Relay Rack, 24 Position for Mini size relays
PART NUMBER 381015

  • SSR Module Positions: 24
  • Module Size Supported: Mini
  • Rack Size: 8" x 6" (203.2mm x 152.4mm)

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)

  • DC OUTPUT
  • AC OUTPUT
  • DC INPUT
  • AC INPUT

 

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.


SSR Specifications

SSR DC Output specifications

SSR DC Output (Red)
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. (Amp)
5
5
5
5
Derating (mA per ºC above 25 ºC)
33º C
33º C
33º C
33º C
Max. Off-state Leakage @ 60Vdc Load (mAmp)
1.5
1.5
0.01
0.01
Maximum Turn-on Time (µSec)
20
20
75
75
Maximum Turn-off Time (µSec)
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 (mAmp)
10
10
10
10
Max. Logic Supply Current @ Nominal VCC (mAmp)
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 per Amp)
1.0
1.0
1.5
1.5
Input to Output Capacitance (typical pF)
10
10
10
10
Vibration1
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
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 and 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)

 

SSR AC Output specifications

SSR AC Output (Black)
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. (Amp)
5
5
5
5
Derating (mA per ºC above 25ºC)
33º C
33º C
33º C
33º C
Max. Off-state Leakage @ 60Vdc Load (mA)
1.5
1.5
0.01
0.01
Maximum Turn-on Time (µSec)
20
20
75
75
Maximum Turn-off Time (µSec)
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
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
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 and 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)

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