SSA - Smart Current Sensor
Amplified Differential Analog Output and Reinforced Galvanic Isolation
•
•
•
•
•
±100A to ±1000A
1500VDC Galvanic Reinforced Isolation
Amplified Output
0.1% Tolerance
Compared to Hall Effect Technology
»
Superior Overall Current Measurement Accuracy
»
Unipolar Power Supply
»
Lower Temperature Drift
»
No Periodic Calibration
»
Higher operating temperature range
•
Typical Applications:
»
Battery Systems
»
UPS systems
»
Motor Drives
LISTED
»
Frequency Inverters
Measurement and Testing Equipment
»
Fuel Cells
E514971
SPECIFICATIONS
Nominal Current (±)
Maximum Current
Power Supply (3.0 to 5.5vdc)
high impedance load
Differential Analog Output
Power Dissipation
±2.62 volts maximum unclipped
Rated current including primary terminations
DC Offset (maximum @ 25°C)
Initial Accuracy
Linearity over Current Range
Bandwidth (electronics)
Reaction Time (typical)
Common Mode Rejection Ratio
Common Mode Transient Immunity
Signal to Noise Ratio (SNR)
Long term stability
Reinforced Isolation
Operating Temperature
Storage Temperature
Materials (RoHS Compliant)
Secondary Mating Connector
Optional Accessories
Riedon Inc.
© Riedon, Inc.
300 Cypress Avenue
www.riedon.com
Alhambra CA 91801
sales@riedon.com
(626) 284-9901
Revised: 202111_005
(626) 284-1704
SSA - Smart Current Sensor
Amplified Differential Analog Output and Reinforced Galvanic Isolation
Standard Configuration
B
A
3.9
Dimensions (mm)
SSA-100
A
(±0.5)
(±0.5)
(±0.3)
(±0.3)
(±0.3)
(MAX)
(±0.5)
(±0.5)
(±0.2)
(±0.3)
(±0.3)
Mass
B
SSA-250
SSA-500
SSA-1000
C
G
I
H
C
D
E
F
G
H
I
D
E
F
J
K
2
B
A
3.9
Current Direction for Positive Output
-
-V
o
+
+3.0 to +5.5VDC
GND
C
J
G
K
+V
o
I
UL file E514971
-
CAT III
-
CAT II
-
Product Safety notice -
UL 61010-1, 3rd Edition, May 11, 2012, Revised July 19, 2019, CAN/CSA, C22.2 No. 61010-
1-2 3rd Edition, Revisions dated July 19, 2019. 600v CAT II, 300v CAT III, Pollution Degree II.
CAT III refers to equipment intended to form part of a building installation.
CAT II refers to equipment intended to be supplied by building wiring.
The SSA current sensor must be used in a manner specified by this datasheet, otherwise the
protection provided by the equipment may be impaired. The SSA series should not be treated
as a structural part of the installation and must be properly supported on both ends.
Ordering Information
Example
:
SSA-250
Alhambra CA 91801
100
250
500
1000
Size
Riedon Inc.
© Riedon, Inc.
300 Cypress Avenue
www.riedon.com
sales@riedon.com
(626) 284-9901
Revised: 202111_005
(626) 284-1704
SSA - Smart Current Sensor
Amplified Differential Analog Output and Reinforced Galvanic Isolation
SSA-BASE Mounting Fixture (Optional)
91.4±0.5
20.3±0.2
27.9±0.3
For SSA-100 thru SSA-500
Robust design
5/16-18 Stainless Steel Hardware
Torque Nuts:
11-13 ft-lb (15-17.6 N-m)
• UL 94-V0 rated materials
•
•
•
•
2X
63.5
4.8±0.2
42 MAX
20±1
Ordering Info
:
SSA-BASE
SSA-CABLE Power/Output Connection (Optional)
•
•
•
•
For all SSA models
Color coded 22ga wire
Two twisted pairs
1 meter standard length
Differential Output
White
Yellow
Black
Red
Analog (-)
Analog (+)
Ground
+3.0v to 5.5v
Ordering Info
:
Example
:
Riedon Inc.
© Riedon, Inc.
SSA-CABLE-length
SSA-CABLE-1M
SSA shown with optional accessories
300 Cypress Avenue
www.riedon.com
Alhambra CA 91801
sales@riedon.com
(626) 284-9901
Revised: 202111_005
(626) 284-1704
SSA - Smart Current Sensor
Amplified Differential Analog Output and Reinforced Galvanic Isolation
Frequently Asked Questions
Q: How does the Riedon SSA compare with hall effect technology?
A:
When compared to hall effect technology, the SSA smart current sensor will offer:
•
•
•
•
•
•
•
•
•
•
•
Immunity to stray magnetic fields
Unlike closed loop hall sensors, the SSA has a unipolar power supply requirement
No hysteresis
Low-noise resolution and offset performance allows accurate low-current measurements
Superior offset, gain and linearity performance over entire temperature range
Low noise
Higher bandwidth (300KHz vs 50KHz)
Lighter weight
Superior stability
No sensitivity to conductor positioning
No periodic calibration
Here is a document published by Texas Instruments that discusses some of the technical aspects:
http://www.ti.com/lit/sbaa293
Q: Is the SSA sutiable for AC measurements?
A:
The wide bandwidth of the SSA makes it appropriate for measureing AC currents as well as DC
Q: Is there a derating for temperature?
A:
120
Power Derating
% Rated Current
100
80
60
40
20
0
0
25
50
75
100
105
125
150
Primary Conductor Temperature °C
SSA
Q: How does the output vary with temperature?
A:
Typical Output vs Temperature
0.20%
0.15%
0.10%
0.05%
0.00%
-0.05%
-0.10%
-0.15%
-0.20%
-0.25%
% Normalized Output Voltage
-10
0
10
20
30
40
50
60
70
80
90
Temperature °C
Average
Upper
Lower
Riedon Inc.
© Riedon, Inc.
300 Cypress Avenue
www.riedon.com
Alhambra CA 91801
sales@riedon.com
(626) 284-9901
Revised: 202111_005
(626) 284-1704
SSA - Smart Current Sensor
Amplified Differential Analog Output and Reinforced Galvanic Isolation
Frequently Asked Questions
Q: What are the overload capabilities of the SSA?
A:
The output reading will saturate with an input current that exceeds the corresponding maximum unclipped
voltage output of 2.62volts. Ultimately, the overload capabilities are thermally limited per the derating curve.
Q: What is the best way to connect to the SSA’s terminals?
A:
Make sure connections are clean and well prepared. Bolts to be torqued to the hardware manufacturer’s
recommendations. There should be sufficient clamping force to ensure proper connection. Overlap shown below
should be taken as a minimum. Suitable for Copper, Copper-Clad Aluminum or Aluminum conductors.
20mm
BUSSBAR
OVERLAP
Hardware:
5/16-18 GRADE 5 STEEL OR
M8x1.25 CLASS 8.8 STEEL
TORQUE: 11-13 ft-lb, 15-17.6 N-m
Q: How much heat does the SSA smart current sensor create?
A:
A majority of the heat generated by the SSA is dissipated through the primary conductors. Care should be
taken to ensure that the primary conductors are sized appropriately given expected amperage and conductor
length. We recommend a 70°C maximum conductor temperature. If there are thermal concerns, oversizing the
conductors will help minimize the operating temperature of the smart current sensor.
Q: What size wire is suitable for the SSA?
A:
Copper Conductor Ampacity Ratings (continuous)
mm2
13.3
21.2
33.6
42.4
54
67
85
AWG
6
4
2
1
0 (1/0)
00 (2/0)
000 (3/0)
AMPS (75°C)
65
85
115
130
150
175
200
mm2
107
127
152
203
253
380
887
AWG
0000 (4/0)
250 MCM
300 MCM
400 MCM
500 MCM
750 MCM
1500 MCM
AMPS (75°C)
230
255
285
335
380
475
625
Q: Is it necessary to install the SSA on the low side of the circuit?
A:
The SSA series of smart current sensors is completely isolated, so it may be installed in either the low or high
side of the circuit.
Riedon Inc.
© Riedon, Inc.
300 Cypress Avenue
www.riedon.com
Alhambra CA 91801
sales@riedon.com
(626) 284-9901
Revised: 202111_005
(626) 284-1704
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