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B&R · B&R X20 I/O module
X20PS4951 is a B&R circuit breaker with Rated operational voltage <= 440 V AC; Breaking capacity Icu/Ics Yes; Enclosure rating IP20 (IEC 60529). It is used in distribution boards, motor protection circuits, panel feeders where the installed unit is matched to the original catalog number and a compact, documented part is required.
| Electrical | |
| Rated operational voltage | <= 440 V AC |
|---|---|
| Rated insulation voltage Ui | 500 V eff |
| Breaking capacity Icu/Ics | Yes |
| Input voltage range | 85...264 V AC / 110...300 V DC (IEC 61010) |
| Efficiency | up to 94 % |
| Overload capacity | Yes, using LED status indicator and software |
| I/O and communication | |
| Bus interface | 0.01 W |
| Communication ports | POWERLINK, Ethernet |
| Mechanical | |
| Mounting | 35 mm DIN rail (IEC 60715) |
| Enclosure rating | IP20 (IEC 60529) |
| Environment and compliance | |
| Operating temperature | -25...+60 °C |
| Certifications | CE, UL, cULus |
Values follow the B&R B&amp;R X20 I/O module specification for this catalog number; parameters not confirmed for this variant are omitted rather than estimated.
| B&R B&amp;R X20 I/O module variants | |||
| Catalog number | Breaking capacity Icu/Ics | Rated operational voltage | |
|---|---|---|---|
| X20PS4951 (this page) | Yes | <= 440 V AC | |
| X20PS2100 | — | — | |
| X20PS2110 | — | — | |
| X20PS3300 | Short-circuit proof, temporary overload | <= 440 V AC | |
Before selecting an alternative, confirm its dimensions, terminals and installation requirements in the manufacturer documentation.
The X20PS4951 is the device-level element in a B&R circuit breaker installation. It receives the field signals and control supply listed above — <= 440 V AC — and switches or conditions the load within the <= 440 V AC ratings shown in the Specifications table. Wiring and protective devices are sized to those same numbers, not to a generic assumption.
Typical installations place it in distribution boards, motor protection circuits, panel feeders, where the unit is matched to the original catalog number and the enclosure provides 35 mm DIN rail (IEC 60715) support. Record the catalog number and revision from the nameplate of the installed unit before specifying a like-for-like spare.
Industrial X20PS4951 — Industrial automation component supplied as a like-for-like replacement, selected by catalog number and published ratings. The figures below are taken from the specification table on this page for catalog number X20PS4951; verify the catalog number against your bill of materials before requesting a quotation.
Available from stock with datasheet, certificates and a quotation on request.
Q.Before ordering X20PS4951, which overload capacity entry should be checked?
The overload capacity entry quoted above is Yes, using LED status indicator and software. Confirm this figure against the unit currently in the panel.
Q.Where can I find the rated insulation voltage Ui data for X20PS4951?
It is listed in the specification table for Industrial X20PS4951 as 500 V eff. Use the value as the reference when sourcing a current-production equivalent.
Q.For X20PS4951, what does the specification table state about rated operational voltage?
The specification table lists rated operational voltage = <= 440 V AC for Industrial X20PS4951. Check the revision of the installed unit if the catalog number has been superseded.
Q.How do I confirm compatibility of X20PS4951 before ordering?
Match the catalog number X20PS4951 and the specification values listed above against the installed unit, then confirm the firmware or hardware revision where a revision-sensitive part is involved.
Q.Can the X20PS4951 replace the unit currently installed in my panel?
Compare catalog number X20PS4951 and the ratings above with the nameplate of the installed device. A current-production equivalent is selected by function and electrical rating, not by the label alone.
Standard (US & Canada, tracked courier): delivered in 5–8 business days. In-stock items are processed within 2–4 business days. USD 25 flat rate on orders under $500.00; free on orders of $500.00 and above.
Express (DHL Express / FedEx International): upgraded expedited delivery in 2–4 business days. The Express surcharge is calculated at checkout based on destination and order weight.
Non-Stock / On-Order items ship on request: dispatch time is confirmed before your order — see our Shipping Policy. Shipping charges and available services are displayed at checkout. See the Shipping Policy for details.
Every product is covered by a 12-month seller warranty provided by SHLY-PLC, effective from the date of delivery, against defects in materials and workmanship under normal use.
This warranty does not cover damage from misuse, improper installation, power surges, neglect, unauthorized repair, or normal wear and tear. See our Return Policy for warranty-claim instructions.
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