SSA-2 BOURNS | Alldatasheet

Document overview

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Technical content

Features

n Formerly a Riedon™ product n Nominal current: 100 A to 1000 A n AC or DC circuits n 1500 VDC reinforced isolation n Tolerance of ±0.2 % n Amplified differential output: ±2.5 V peak n RoHS compliant*

Applications

Characteristic SSA-2-100A SSA-2-250A SSA-2-500A SSA-2-1000A Nominal Current (A) 100 250 500 1000 Differential Analog Output ±2.6 volts maximum unclipped ±12.5 mV/A ±5 mV/A ±2.5 mV/A ±1.25 mV/A Power Dissipation Rated current at primary terminations 4 W 9 W 17 W 35 W Maximum Current (unclipped output) 200 A 500 A 1000 A 2000 A Over Current (1 s, clipped) 600 A 1500 A 3000 A 6000 A Power Supply (3.0 to 5.5 VDC) with high impedance load @ 3.0 V, 20 mA typical @ 5.5 V, 40 mA typical DC Offset @ 25 °C ≤ ±0.4 mV (10 Hz LP filter) Initial Accuracy @ 25 °C ±0.2 % (Offset is zeroed prior to calibrating using DC current) TCR (25 °C - 95 °C) ±30 PPM/°C Bandwidth (electronics) 300 kHz Reaction Time (typical) 1.6 µs (input step function, 50 % rise on input to 50 % rise on output) Common Mode Rejection Ratio CMRR: -100 dB @ DC, -98 dB @ 10 kHz Common Mode Transient Immunity CMTI: 80 kV/µS typical, 55 kV/µS minimum Signal to Noise Ratio (SNR) VIN = 100 mVPP, fIN = 1 kHz, BW = 10 kHz 80 dB min., 84 dB typical VIN = 100 mVPP, fIN = 10 kHz, BW = 100 kHz 70 dB typical Long-Term Stability < ±0.2 % 1000 hours 45 °C terminal temperature < ±0.5 % 1000 hours 100 °C terminal temperature Reinforced Isolation 1500 VDC 1000 VAC RMS (maximum continuous working voltage) Dielectric Strength 3500 VAC RMS 1 minute Operating Temperature -40 °C to +115 °C ambient -40 °C to +125 °C primary conductor (see derating curve on page 4) Storage Temperature -55 °C to +125 °C How to Order SSA-2 - 100A Model Nominal Current 100A = 100 A 500A = 500 A 250A = 250 A 1000A = 1000 A Materials (RoHS Compliant) Additional Information Click these links for more information: PRODUCT TECHNICAL LIBRARY INVENTORY SAMPLES CONTACT WARNING Cancer and Reproductive Harm www.P65Warnings.ca.gov Product Safety Notice The SSA-2 Series Current Sensor must be used in a manner specified by this data sheet, otherwise the protection provided by the equipment may be impaired. The SSA-2 Series should not be treated as a structural part of the installation and must be properly supported on both ends. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. *RoHS Directive 2015/863, Mar 31, 2015 and Annex. “Bourns” is a registered trademark of Bourns, Inc. in the United States and other countries. In April 2023, BE Services Company, Inc., a subsidiary of Bourns, Inc., purchased certain assets of Riedon, Inc., including its logo and trademarks and the right to continue to manufacture former Riedon™ products. “Riedon Logo” is a registered trademark of BE Services Company, Inc., in the United States. “Riedon” is a trademark of BE Services Company, Inc. “Manganin” is a registered trademark of Isabellenhütte Heusler GmbH & Co. KG.

Riedon™ SSA-2 Series Analog Current Sensors by Bourns Product Dimensions C A G H DIA. 2 PLCS. D F E B 2.5 (.098) C J I A G H DIA. 4 PLCS. D F EB 2.5 (.098) SSA-2-100A to SSA-2-500A SSA-2-1000A Product Dimensions Model SSA-2-100A SSA-2-250A SSA-2-500A SSA-2-1000A Model SSA-2-100A SSA-2-250A SSA-2-500A SSA-2-1000A A 63.5 ± 0.5 (1.102 ± .020) B 84 ± 0.5 (.343 ± .020) C 20 ± 0.5 (.787 ± .020) 40 ± 0.5 (.748 ± .020) D 3 ± 0.5 (.118 ± .020) 4 ± 0.5 (.413 ± .020) E 16.4 ± 0.5 (.646 ± .020) 17.4 ± 0.5 (.685 ± .020) Mass (g) 67 69 84 145 F 48.7 ± 0.5 (1.917 ± .020) 68.7 ± 0.5 (2.705 ± .020) DIMENSIONS: MM (INCHES) Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. Connectors Mating Connector Molex Part Number 4-Pin Female 1053071204 20-22 AWG Female Crimp Terminals 1053002200* 4-Pin TPA (Optional) 1053251004 * Use Gold (Au) plated contacts for 115 °C temperature rating.

Riedon™ SSA-2 Series Analog Current Sensors by Bourns Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. Optional Base Mounting Fixtures SSA-BASE (Model SSA-2-100A ~ SSA-2-500A) SSA-BASE-1K (Model SSA-2-1000A) 20.3 ± 0.2 (.799 ± .008) 4.8 ± 0.2 (.189 ± .008) DIA. 2 PLCS. 91.4 ± 0.5 (3.598 ± .020) 63.5 (2.50) (1.654) MAX. 27.9 ± 0.3 (1.098 ± .012) 20 ± 1 (.787 ± .039) 20.3 ± 0.2 (.799 ± .008) 4.8 ± 0.2 (.189 ± .008) DIA. 2 PLCS. 91.4 ± 0.5 (3.598 ± .020) 63.5 (2.50) (1.654) MAX. 19.1 ± 0.3 (.752 ± .012) 20 ± 1 (.787 ± .039) 47 ± 0.3 (1.850 ± .012) DIMENSIONS: MM (INCHES) DIMENSIONS: MM (INCHES)

  • Robust design
  • 5/16-18 Stainless Steel Hardware
  • Torque Nuts:
  • Accessories made from UL 94-V0 rated materials Optional SS-CABLE Power / Serial Connection SS-CABLE-1M
  • For all SSA-2 models
  • Color-coded 22 ga wire
  • Two twisted pairs
  • 1 meter standard length Serial Output White Analog (–) Pin 1 Yellow Analog (+) Pin 2 Black Ground Pin 3 Red +3.0 to 5.5 V Pin 4 Features:

Riedon™ SSA-2 Series Analog Current Sensors by Bourns Frequently Asked Questions Q: How does the SSA-2 Series compare with Hall Effect technology? A: When compared to Hall Effect technology, the SSA-2 Series Analog Current Sensor will offer:

  • Immunity to stray magnetic fields
  • Unlike closed loop hall sensors, the SSA-2 Series 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 (300 kHz vs 50 kHz)
  • Lighter weight
  • Superior stability
  • No sensitivity to conductor positioning
  • No periodic calibration Q: Is the SSA-2 Series suitable for AC measurements? A: The wide bandwidth of the SSA makes it appropriate for measuring AC as well as DC currents. Q: How does the output vary with temperature? 120 100 0 25 50 75 100 115 125 150 RATED POWER (%) PRIMARY CONDUCTOR TEMPERATURE (°C) Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. Q: Is there a derating for temperature? Typical Output vs Temperature 0.20 0.15 0.10 0.05 0.00 -0.05 -0.10 -0.15 -0.20 -0.25 -10 10 20 30 40 50 60 70 80 900 TEMPERATURE (°C) NORMALIZED OUTPUT VOLTAGE (%) AVERAGE UPPER LOWER Q: What are the overload capabilities of the SSA-2 Series? A: The output reading will saturate with an input current that exceeds the corresponding maximum unclipped voltage output of 2.62 volts. Ultimately, the overload capabilities are thermally limited per the derating curve.

Riedon™ SSA-2 Series Analog Current Sensors by Bourns Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. Frequently Asked Questions (Continued) Q: What is the best way to connect to the SSA-2 Series terminals? A: Make sure connections are clean and well prepared. Bolts must 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. 20 mm BUSBAR 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-2 Series Analog Current Sensor create? A: A majority of the heat generated by the SSA-2 Series 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 shunt sensor. Q: Is it necessary to install the SSA-2 Series on the low side of the circuit? A: The SSA-2 Series Analog Current Sensors are completely isolated, so it may be installed in either the low or high side of the circuit. Q: Thermal EMF? A: Thermal EMF happens when the two sensing terminals of the shunt sensor experience different temperatures. This phenomenon is essentially eliminated with the differential output of the device. It is still possible that the two current carrying terminals could experience a temperature differential, however. This offset would be 0.5 mV/°C. Q: Is there a version with digital outputs? A: Bourns plans to develop digital output versions in the very near future. Q: What size wire is suitable for the Model SSA-2 Series? Copper Conductor Ampacity Ratings (continuous) mm2 AWG Amps (75 °C) mm2 AWG Amps (75 °C) 13.3 6 65 107 0000 (4/0) 230 21.2 4 85 127 250 MCM 255 33.6 2 115 152 300 MCM 285 42.4 1 130 203 400 MCM 335 54 0 (1/0) 150 253 500 MCM 380 67 00 (2/0) 175 380 750 MCM 475 85 000 (3/0) 200 887 1500 MCM 625

Riedon™ SSA-2 Series Analog Current Sensors by Bourns Frequently Asked Questions (Continued) Q: Is there a functional diagram of the general layout? PRIMARY CURRENT ISOLATED POWER SUPPLY AMPLIFIER

1500 V REINFORCED ISOLATION

3.0 V to 5.5 V GND OUTP OUTN 2 3 4 Q: How do I improve the signal to noise ratio (SNR) of the current sensor? A: Oversampling and averaging are two ways to increase SNR and resolution. Q: Is there a way to convert the differential output to a single-ended output? A: VCM will be the new zero current point and the output will be offset by this amount. R3, R4, RS set the gain. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. OUTP OUTN VCMADC TO ADC C1 C2 GND Q: Is there another way to read the differential output with single ended ADCs? A: The SSA-2 Series outputs have a common mode voltage of about +1.44 VDC referenced to ground. The difference between OUTP and OUTN is the differential voltage. You can use two single-ended ADC channels to measure the OUTP and OUTN voltages referenced to ground and then just subtract the two in software to find the differential voltage. Ideally, you would do a simultaneous measurement, if possible. For example: If OUTP measures 1.85 V and OUTN measures Q: I notice a high frequency noise on the output signal, why is this? A: The SSA-2 Series Current Sensor has an output chopper circuit at 625 kHz. This is how we achieve the good DC- accuracy and low temperature drift of offset and gain. Chopping noise is the differential errors (mismatch, etc.) that have been modulated to high frequency to remove them from the baseband. The chopping noise is far above the SSA-2 Series bandwidth of 300 kHz. Use an analog filter to attenuate if necessary, see below. Q: How do I improve the stability of precision DC current readings? A: Analog Filtering: The SSA-2 Series has no internal filtering to maximize its 300 KHz bandwidth for high speed AC measurements. Most applications will operate at much lower frequencies and would benefit greatly from analog filtering, especially for DC signals. A low pass RC filter before the AID converter will improve the signal. Pick the lowest practical filter frequency. Typically one would prioritize lower resistance values and higher capacitances to reduce Johnson noise and output impedance. SSA OUTPUTS Vo+ Vo− ADC+ ƒ3dB = 1 4πRƒCƒ ADC− Rf Rf Cf A: Digital Filtering: The filtering can be done digitally by the CPU. Averaging multiple readings will stabilize the readings at the cost of CPU cycles.

Riedon™ SSA-2 Series Analog Current Sensors by Bourns Frequently Asked Questions (Continued) Q: I’m getting overshoot on fast rising currents. Why? A: When using the SSA-2 Series in square wave or pulse applications without filtering, the output will have an excessive amplitude due to the skin effect of the shunt. This will be true with microsecond rise-time currents. The output of the shunt is inversely proportional to its effective cross-sectional area. For the first couple of microseconds the current is flowing on the surface of the resistance material and not evenly across the whole cross- sectional area like with lower frequency currents. The higher the Δl/Δt, the lower the effective cross-section which results in a higher resistance and a higher output voltage. In under 10 microseconds, the current is flowing through the whole cross-section and the output returns to normal. The amplitude of the pulse is hard to quantify as it is highly dependent on the rest of the circuit’s reactance. Filtering is the usual answer. This can either be placed on the output of the SSA-2 Series Analog Current Sensor before the ADC or Bourns can add a filter internally on the sensing side of the electronics. Contact Bourns if this is required. Current Sensor Cross-section CURRENT FLOWING THROUGH ENTIRE CROSS-SECTION CURRENT FLOWING ONLY ON SURFACE Step response from Fluke 5220A amplifier at 20 A square-wave current (no load), 20 µs/div range Americas: Tel: +1 951-781-5500 • Email: americus@bourns.com Mexico: Tel: +52-614-478-0400 • Email: mexicus@bourns.com Asia: Tel: +886-2-2562-4117 • Email: asiacus@bourns.com EMEA: Tel: +36 88 885 877 • Email: eurocus@bourns.com www.bourns.com REV. 02/25 Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and its affiliates (collectivel , “Bourns”). Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change without notice. Users should check for and obtain the latest relevant information and verify that such information is current and complete before placing orders for Bourns® products. The characteristics and parameters of a Bourns® product set forth in its data sheet are based on laboratory conditions, and statements regarding the suitability of products for certain types of applications are based on Bourns’ knowledge of typical requirements in generic applications. 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