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        • Lifecycle status

          Active / Available from OEM
          Apter Power can coordinate a quotation and sourcing details for this assessed safety-light-curtain configuration.

        SF4B-A20C

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        Panasonic SF4B-A20C is a cable-type Type 4 safety light curtain for arm and foot protection at machinery access openings.
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        Ships by Wednesday, October 28
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for SF4B-A20C

        • Manufacturer:
          Panasonic
        • Part Number:
          SF4B-A20C
        • Product Family:
          Panasonic
        • Product Type:
          Compact safety light curtain
        • Stock:
          1
        • ESPE type:
          IEC 61496 Type 4
        • Intended detection category:
          Arm / foot protection
        • Beam channels:
          20
        • Beam pitch:
          40 mm
        • Minimum sensing object, normal unblanked setting:
          Ø45 mm opaque object
        • Protective height:
          823.4 mm
        • Operating range:
          0.3–7 m
        • Supply voltage:
          24 V DC ±10%
        • Safety outputs:
          OSSD 1 and OSSD 2, switchable PNP/NPN
        • Device OFF response time:
          ≤14 ms (not machine stopping time)
        • ON response time:
          80–90 ms
        • Cable:
          5 m, 8-core, heat-resistant PVC
        • Degree of protection:
          IP65
        • Operating temperature:
          −10 to +55 °C; no condensation or icing
        • Emission halt:
          Incorporated
        • External device monitoring:
          Incorporated
        • Interlock:
          Manual / auto reset, wiring selectable
        • Muting:
          Not provided
        • Override:
          Not provided
        • Functional-safety standards, device scope:
          ISO 13849-1:2015 Category 4, PLe; IEC 61508-1 to 3 SIL3; machine category depends on external-circuit wiring
        • Weight:
          1.3 kg
        • Tariff Code:
          Please confirm the destination before shipping
        • Country of origin:
          Japan
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Blanking Limits Output Indication Cable Installation Product Applications

        Features:

        • The SF4B-A20C arm/foot configuration can guard a taller assessed opening than a short hand-protection configuration; assess the actual access path before selecting it.
        • Four-block beam-axis indicators help position the paired units before commissioning.
        • Manual or automatic interlock operation can be selected by the prescribed wiring arrangement.
        At the access point, the emitter and receiver establish a defined optical field; the external safety circuit must provide the required response to the safety outputs.

        The four-block beam-axis alignment indicator shows where light is being received as the paired units are positioned. Use it for initial alignment, then complete the machine-level functional test before use.

        The interlock function can use manual or automatic reset through the wiring arrangement. Choose the reset behavior as part of the safety-control design rather than assuming the same startup behavior in both configurations.

        Apter Power can assist with documentation for the Panasonic SF4B-A20C compact safety light curtain; the installation still requires machine-level validation.
        Panasonic SF4B-A20C Compact safety light curtain Manuals,Datasheets,Link
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Moving obstruction, not muting: SF4B-A20C has no muting or override function. Optional floating blanking can tolerate a configured number of interrupted, unspecified beams during a limited moving-obstruction case; it is not an unrestricted material-flow bypass. Reassess the changed minimum detectable object and safety distance before enabling it.
        • Fixed obstruction: Optional fixed blanking addresses an object that remains in selected beam channels, unlike floating blanking for a moving obstruction. Both settings require the SFB-HC handy-controller; Panasonic lists SFC-WNC1 separately as the cable set for connecting it to a cable-type light curtain.
        • Safety versus indication: Use OSSD 1 and OSSD 2 for the external safety-control path; the auxiliary output can provide non-safety state indication but cannot replace either safety output.
        • Indicator availability: SF4B-A20C does not incorporate the large multi-purpose indicator function. An installation requiring prominent local status must plan indication around the supported non-safety output and actual machine interface.
        • Pair routing: SF4B-A20C has a separate integral lead on the emitter and receiver. Plan a protected route from each side of the guarded opening to the external safety-control location before fixing the pair to the frame.
        • Power-line separation: Route both safety-curtain leads apart from high-voltage and power lines, rather than sharing a raceway. Panasonic warns that induction can cause a malfunction, so check that segregation remains possible along both routes.
        • Guarded stationary-machine opening: A paired SF4B-A20C field can be integrated at a stationary machinery access opening when the external safety circuit and machine stopping behavior are validated.
        • Unsuitable moving or non-stopping equipment: Do not apply this curtain to mobile equipment such as AGVs or machinery that cannot be stopped immediately during its operating cycle by an emergency-stop system.
        Description
        SF4B-A20C forms a protective field between an emitter and receiver across a machinery opening. The paired device provides two safety outputs for the external stop circuit. The light curtain is one element of the protective system, not a stand-alone approval for the machine.

        For frame-integrated guarding, SF4B-A20C uses the compact SF4B-C body. Its profile can be incorporated along an aluminum machine frame. If the optional standard mounting bracket is used, Panasonic specifies one MS-SF4BC-5 intermediate support set for this 20-beam configuration; the end brackets alone are not the complete mounting arrangement.

        Alongside SF4B-A20C's paired optical field, its incorporated ELCA function reduces mutual interference between neighboring light curtains. This helps when multiple guarded openings are close together, but the layout and alignment still have to follow the specified installation precautions rather than assuming interference control alone establishes a safe arrangement.
        Technical notes
        When extending the SF4B-A20C integral leads, keep the total cable length within Panasonic's published 50 m limit and use conductors of at least 0.2 mm². If a non-exclusive cable extends the orange synchronization pair, use shielded twisted-pair conductors. Verify each installed run against these published conditions before functional commissioning.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Our guard must detect a 25 mm opaque object. Can SF4B-A20C be selected for that opening?
        No. Its normal minimum detectable opaque object is Ø45 mm, so it does not meet this smaller-object detection requirement. Select a device whose rating meets the risk assessment and validate the complete protective arrangement before use.
        Our guarded opening is 700 mm high. Can one SF4B-A20C pair cover it?
        Its published protective height is 823.4 mm, so the field is long enough for a 700 mm opening only if positioned to cover every route into the hazard. Do not equate this dimensional fit with a safe machine installation; stopping distance and any alternate access path still need assessment.
        Our existing machine harness ends in a light-curtain connector. Can SF4B-A20C plug into it without changing the wiring plan?
        No. This is a direct-cable model with an integral 5 m lead, not a connector-pigtail device. Plan both cable terminations for this ordering code, or select a manufacturer-listed connector configuration if the installed harness must be retained; do not assume that a different configuration is interchangeable.

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