Table Of Contents

SWB-2810A/B Specifications

    Last Modified: April 21, 2017

    This document lists specifications for the SWB-2810A/B matrix relay card. All specifications are subject to change without notice. Visit for the most current specifications. Refer to the NI Switches Help for detailed topology information.


    1-wire 4 × 43 matrix

    About These Specifications

    Specifications characterize the warranted performance of the instrument under the stated operating conditions.

    Typical Specifications are specifications met by the majority of the instrument under the stated operating conditions and are tested at 23 °C ambient temperature. Typical specifications are not warranted.

    All voltages are specified in DC, ACpk, or a combination unless otherwise specified.

    Clean devices and terminal blocks by brushing off light dust with a soft, nonmetallic brush. Remove other contaminants with a soft, lint-free, dampened cloth. Do not use detergent or chemical solvents. The unit must be completely dry and free from contaminants before returning to service.



    This module is rated for Measurement Category I and intended to carry signal voltages no greater than 100 Vrms/150 Vpk/150 VDC. This module can withstand up to 800 V impulse voltage. Do not use this module for connection to signals or for measurements within Categories II, III, or IV. Do not connect to MAINS supply circuits (for example, wall outlets) of 115 VAC or 230 VAC. Refer to the Read Me First: Safety and Electromagnetic Compatibility document for more information on measurement categories.


    Measurement Categories CAT I and CAT O are equivalent. These test and measurement circuits are not intended for direct connection to the MAINs building installations of Measurement Categories CAT II, CAT III, or CAT IV.


    In systems that include cards with different maximum voltages, the lowest safety voltage rating as specified on the front of the card applies for the entire system. The system can include all cards in the carrier, and all cards in other carriers that are connected with the NI 2806 expansion bridge.


    When hazardous voltages (>42.4 Vpk/60 VDC) are present on any channel, safety low-voltage (≤42.4 Vpk/60 VDC) cannot be connected to any other channel.


    Refer to the Read Me First: Safety and Electromagnetic Compatibility document for important safety and electromagnetic compatibility information. To obtain a copy of this document online, visit, and search for the document title.


    To ensure the specified EMC performance, operate this product only with shielded cables and accessories.


    The protection provided by the SWB-2810A/B can be impaired if it is used in a manner not described in this document.


    Always disconnect or turn off power sources before powering on a chassis.

    Input Characteristics

    Maximum switching voltage


    150 V, CAT I


    150 V

    Maximum switching current

    1.0 A (per channel)

    Maximum carry current

    1.0 A (per channel)

    Maximum switching power

    Per channel

    20 W

    Per crosspoint

    20 W

    DC path resistance


    <1 Ω


    ≥2 Ω

    Open channel

    >1 × 109 Ω


    DC path resistance typically remains low for the life of the relay. At the end of relay life, the path resistance rises rapidly above the specified value. Load ratings apply to relays used within the specification before the end of relay life.

    Thermal EMF, typical

    <150 μV

    Bandwidth, typical (-3 dB, 50 Ω termination, column-row-column)

    ≥10 MHz

    Crosstalk, typical (50 Ω termination) channel-to-channel

    10 kHz

    <-60 dB

    100 kHz

    <-50 dB

    1 MHz

    <-40 dB

    Isolation, typical (50 Ω termination) open channel

    10 kHz

    >65 dB

    100 kHz

    >60 dB

    1 MHz

    >35 dB

    Analog bus line connections

    AB <0..3> (4 lines)

    Dynamic Characteristics

    Simultaneous drive limit[1]

    176 relays

    Relay operate/release time (simultaneous relays), typical[2]

    Up to 8 relays

    <1 ms

    Up to 50 relays

    <2 ms

    Expected relay life, mechanical (no load)

    1 × 109 cycles

    Expected relay life, electrical (resistive, <10 pF load)

    10 V,100 mA

    1 × 108 cycles

    20 V, 500 mA

    1 × 107 cycles

    20 V, 1 A

    4 × 106 cycles

    100 V, 10 mA

    1 × 106 cycles


    Optional 100 Ω series protection resistance, available for the interface cable, increases the expected relay life at higher voltages by protecting the reed relays from the effects of cable and load capacitance. For more information about increasing the life of your relay, visit and enter the Info Code relaylifetime.


    Reed relays are highly susceptible to damage caused by switching capacitive and inductive loads. Capacitive loads can cause high inrush currents, and inductive loads can cause high flyback voltages. The addition of appropriate protection can greatly improve contact lifetime. For more information about adding protection circuitry to a capacitive load, visit and enter the Info Code relaylifetime. For information about inductive loads, enter the Info Code relayflyback.


    Power consumption per relay

    50 mW

    Power consumption limit[3]

    8.8 W

    Power dissipation limit


    8.8 W


    8.8 W

    Physical Characteristics

    Relay type


    Relay contact material


    I/O connectors

    96 position, plastic SCSI

    Power requirement, carrier

    20 W at 5 V, 5 W at 3.3 V

    Dimensions (L × W × H)

    11.2 cm × 1.2 cm × 17.1 cm (4.4 in. × 0.5 in. × 6.7 in.)


    240 g (8.5 oz)

    Reed Relay Life

    Reed Relay Life Nomograph

    The following figure shows the reed relay lifetime nomograph. The purpose of this graph is to estimate reed relay lifetime.


    This nomograph is not meant to be an exact or guaranteed specification and should only be used as a guideline to estimate lifetime. Actual reed relay lifetimes may vary, depending on application.

    Figure 2. Reed Relay Lifetime Nomograph

    Estimating Reed Relay Life

    Complete the following steps to estimate relay lifetimes using the nomograph:
    1. Determine the peak voltage experienced across the relay while switching and mark this value on the Volts line.
    2. Determine the sum of the DUT, cable, and instrumentation capacitances and mark this value on the Load Capacitance line.
    3. Draw a straight line between both values. The intersection points of this line and the No Protection and 50 Ω Protection axes are the corresponding estimated relay lifetimes in cycles.

    Estimating Reed Relay Life Example

    The reed relay module is connected to a DMM through 1 meter of cable. The DMM and cable capacitances are 100 pF and 30 pF respectively. The maximum voltage switched across the relay is 50 V. Determine the estimated number of relay cycles with and without protection resistance.

    Estimating Reed Relay Life Solution

    The total load capacitance is the sum of the cable and DMM capacitance, which is 130 pF. Draw a line between the 50 V point on the Volts axis and 130 pF on the Load Capacitance axis.

    The line drawn intersects the Cycles axes at approximately 500,000 on the No Protection axis and about 25,000,000 on the 50 Ω Protection axis (refer to the following figure). This series resistance should be placed as close as possible to the relay for maximum effect.

    Figure 3. Reed Relay Life Nomograph Solution


    Maximum altitude

    2,000 m (at 25 °C ambient temperature)

    Pollution Degree


    Indoor use only.

    Operating Environment

    Ambient temperature range

    0 °C to 55 °C (Tested in accordance with IEC-60068-2-1 and IEC-60068-2-2.)

    Relative humidity range

    10% to 90%, noncondensing (Tested in accordance with IEC-60068-2-56.)

    Storage Environment

    Ambient temperature range

    -20 °C to 70 °C (Tested in accordance with IEC-60068-2-1 and IEC-60068-2-2.)

    Relative humidity range

    5% to 95%, noncondensing (Tested in accordance with IEC-60068-2-56.)

    Operational shock

    30 g peak, half-sine, 11 ms pulse (Tested in accordance with IEC-60068-2-27. Test profile developed in accordance with MIL-PRF-28800F.)

    Random vibration


    5 Hz to 500 Hz, 0.3 grms


    5 Hz to 500 Hz, 2.4 grms (Tested in accordance with IEC-60068-2-64. Nonoperating test profile exceeds the requirements of MIL-PRF-28800F, Class 3.)

    Compliance and Certifications


    This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use:
    • IEC 61010-1, EN 61010-1
    • UL 61010-1, CSA 61010-1

    For UL and other safety certifications, refer to the product label or the Online Product Certification section.

    Electromagnetic Compatibility

    This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:
    • EN 61326-1 (IEC 61326-1): Class A emissions; Basic immunity
    • EN 55011 (CISPR 11): Group 1, Class A emissions
    • AS/NZS CISPR 11: Group 1, Class A emissions
    • FCC 47 CFR Part 15B: Class A emissions
    • ICES-001: Class A emissions

    In the United States (per FCC 47 CFR), Class A equipment is intended for use in commercial, light-industrial, and heavy-industrial locations. In Europe, Canada, Australia, and New Zealand (per CISPR 11), Class A equipment is intended for use only in heavy-industrial locations.


    Group 1 equipment (per CISPR 11) is any industrial, scientific, or medical equipment that does not intentionally generate radio frequency energy for the treatment of material or inspection/analysis purposes.


    For EMC declarations, certifications, and additional information, refer to the Online Product Certification section.

    CE Compliance

    This product meets the essential requirements of applicable European Directives, as follows:
    • 2006/95/EC; Low-Voltage Directive (safety)
    • 2004/108/EC; Electromagnetic Compatibility Directive (EMC)

    Online Product Certification

    To obtain product certifications and the DoC for this product, visit, search by model number or product line, and click the appropriate link in the Certification column.

    Environmental Management

    NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial not only to the environment but also to NI customers.

    For additional environmental information, refer to the Minimize Our Environmental Impact web page at This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.

    Waste Electrical and Electronic Equipment (WEEE)
    EU Customers  

    At the end of the product life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers, National Instruments WEEE initiatives, and compliance with WEEE Directive 2002/96/EC on Waste Electrical and Electronic Equipment, visit


    National Instruments符合中国电子信息产品中限制使用某些有害物质指令(RoHS)。关于National Instruments中国RoHS合规性信息,请登录。(For information about China RoHS compliance, go to


    Refer to for more information about the following accessories.


    Use only NI cables. Cables with metal connectors might expose the user to hazardous voltages.


    To ensure the specified EMC performance, operate this product only with shielded cables and accessories. Do not use unshielded cables or accessories unless they are installed in a shielded enclosure with properly designed and shielded input/output ports and are connected to the NI product using a shielded cable. If unshielded cables or accessories are not properly installed and shielded, the EMC specifications for the product are no longer guaranteed.

    Table 1. NI Accessories for the SWB-2810A/B
    Accessory Part number
    SH96F-96M-NI SwitchBlock Cable 150275-01
    SH96F-96M-RES-NI SwitchBlock Cable with 100 Ω resistance 150579-01
    NI TBX-2809 Screw Terminal Accessory (unshielded) 781420-09
    • 1 The overall carrier drive limit prevents simultaneous drive of relays under the card limit on some cards in some configurations. Refer to the NI 2800 Specifications for information about carrier drive limit.
    • 2 Relay operate and release times depend on PC and PXI bus performance and application software. For more information about NI SwitchBlock relay operate times, visit and enter the Info Code exa9ee.
    • 3 For more information about NI SwitchBlock power limits, visit and enter the Info Code sbpwrlim.

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