Schneider Preventa Safety Relay & Light Curtain Alternatives — DAIDISIKE DA31, DQC / DQA / DQT4

We keep cross-reference notes for the brands customers most often arrive with, and in machine safety one of those brands is Schneider Electric. Its safety line carries the Preventa name — originally a Telemecanique brand, now Schneider's, with the curtains marketed under Telemecanique Sensors. Two Preventa families dominate the inquiries: the XPS safety relays and the XUSL Type 4 light curtains. Because those two parts usually sit in the same guarding loop — the curtain's OSSD outputs wired into the relay — this page covers both, mapped onto the DAIDISIKE DA31 and the DQ-series curtains. Everything here is built from Schneider / Telemecanique public specs and our own datasheets, never from a copied manual.

One blunt point first. None of this is a part number you look up and drop in. Schneider's order numbers (the relay XPSAF5130, the curtain XUSL4E14F046N, and so on) belong to Schneider parts; the DA31 has its own rated SKU, the DA31-B, and its own terminal layout. A swap is sound when the function, ratings and physical fit line up and you re-wire to the new module — and, for curtains, when you re-run the ISO 13855 distance. The rest of this page is about getting that right, family by family.

What is Preventa, and what are the DAIDISIKE equivalents?

Preventa is Schneider Electric's machine-safety brand. The relevant parts here are two families. The XPS safety relays are electromechanical, DIN-rail modules: the flagship XPS-AF / XPS-AFL (E-stop and guard/limit-switch monitoring; the AFL variant is specifically for light-beam / curtain ESPE OSSD interfacing), the XPS-AC and XPS-AK (E-stop and guard monitoring), the time-delayed XPS-AT / XPS-AV (stop-category-1 controlled deceleration), the universal XPS-U, and the configurable XPSMC / XPSMP controllers. The confirmed XPSAF5130 spec is 24 V AC/DC, single or dual-channel, 3 NO safety contacts plus aux, force-guided, PL e / Category 4 (EN ISO 13849-1) and SILCL 3 (IEC 62061), 6 A rated contacts, IP20, ~22.5 mm wide.

The XUSL / XUSLM light curtains are all Type 4. The part-number grammar encodes resolution and function: 14 mm finger models (XUSL4E14F…), 30 mm hand models (XUSL4E30H…), 2/3/4-beam body-protection models (…BB…), and integrated-muting variants (XUSL4M / XUSL4MB). They are rated Type 4 (IEC 61496-1/-2), SIL 3 (IEC 61508), SILCL 3 (IEC 62061) and Category 4 / PL e (ISO 13849-1). A verified XUSL4E14F046N has a 7.5 ms response time, 14 mm resolution and a 460 mm protected height — one data point, not a number to generalise across the whole range.

On the DAIDISIKE side, the DA31 is the single-function safety relay: PL e / SIL 3, 3NO+1NC force-guided contacts, dual-channel inputs with cross-fault detection, EDM, <30 ms response, 24 V DC, 22.5 mm DIN (rated SKU DA31-B). The curtains are the DQC (10/14/20/25/30/40/80/200 mm resolution, 0.3–3 m range / 0.3–6 m option, ≤15 ms, IP65), the flagship DQA (same resolution span, range to 50 m on the H variant, ≤15 ms, optical sync, M12 8-pin or aviation connector), and the DQT4 (fine 7.5/15/30 mm resolutions, redundant OSSD + EDM, ≤20 ms typical). All are IEC 61496 Type 4 architecture; PL e / SIL 3 is reached as a complete safety function (curtain + relay/PLC), integrator-verified.

Which Preventa part does what? A family map before you cross-reference

Match the Preventa family to the function first; only then pick the DAIDISIKE part. The Preventa catalogue spans single relays, time-delay relays, two-hand control, configurable controllers, finger/hand/body curtains and a separate XCS interlock line. Here is the honest map of what maps to what — and, just as importantly, what does not.

The takeaway: the DA31 cross-references cleanly to the single-function XPS relays (XPS-AF/AFL/AC/AK), the DQ curtains cover the XUSL Type 4 duties, and the DX guard-locking switches map to the separate XCS interlock line — not to XPS or XUSL. Three things deliberately do not get forced: a single DA31 does not replace an XPSMC/XPSMP controller; the DA31 does not replicate XPS-AT/AV time-delayed outputs; and DAIDISIKE's DLD LiDAR has no Preventa counterpart at all (Schneider has no safety laser scanner under the brand) — the DLD is an AGV/AMR obstacle-avoidance sensor, not a certified Type 3 safety scanner.

DA31 vs Preventa XPSAF5130 — the relay side-by-side

The DA31's honest 1:1 target is the XPSAF5130-class relay — both 3 NO, both PL e / SIL 3 Cat 4, both force-guided, both ~22.5 mm, both monitoring E-stop, gate and light-curtain OSSD inputs. This is a function-and-rating comparison from public Schneider / distributor specs, not a drop-in claim. Confirm against your installed unit's label and datasheet before ordering.

Where the Schneider column reads “per Schneider datasheet,” that is deliberate — we will not put a number in a Schneider column unless it is published, and figures vary by XPS variant. The three honest deltas to verify before you swap an XPSAF5130-class relay for a DA31: (1) control voltage — the DA31 is 24 V DC only, while XPS-AF/AC families offer 24/48 V AC variants; (2) contact arrangement — the DA31 is 3 NO + 1 NC, so confirm you do not need a fourth NO; (3) response time — the XPSAF response is faster-rated, which is immaterial for a pure E-stop/gate loop but must be checked against any ISO 13855 stop-time budget if the relay sits in a light-curtain chain.

DQC / DQA / DQT4 vs Preventa XUSL — the curtain side-by-side

The DQ curtains cover XUSL's 14 mm finger and 30 mm hand resolutions directly, offer finer 7.5/10 mm options the XUSL mainline does not list, and the DQA's 50 m range exceeds typical XUSL reach — but the response time delta means you must re-run the safety distance. Type 4 architecture on both sides; the comparison below is by published spec.

How does the EDM / OSSD wiring carry across from Preventa to a DA31?

The architecture is the same on both sides — the curtain's dual OSSD outputs drive the relay's dual-channel inputs, and the relay's EDM loop watches the downstream contactors — but the terminals differ, so you re-wire to the DA31 layout. In a Preventa loop, a XUSL feeds its OSSD pair into an XPS-AFL; in the DAIDISIKE loop, a DQC/DQA/DQT4 feeds its dual OSSD into the DA31's dual-channel safety inputs. The DA31's EDM (external device monitoring) loop reads back the auxiliary NC contacts of the downstream contactors, exactly as the Preventa feedback loop did — if a contactor welds, the relay will not re-enable. Match the OSSD polarity (NPN/PNP) and the connector, then wire the EDM loop through the force-guided contacts of your contactors.

Where do the DX door locks and the DLD LiDAR fit — and where do they not?

The DX guard-locking switches complete the loop with a DA31, but they map to Telemecanique's XCS interlock line, not to Preventa XPS or XUSL. The DLD LiDAR has no Preventa counterpart at all. Keep these clearly separated so you do not over-claim. DAIDISIKE's DX-R1 is a non-contact magnetic-coded safety switch (dual-channel NPN/PNP, PL e / SIL 3 / Cat 4, ISO 14119 Type 4 high-level coded, cascadable), and the DX guard-locking door locks (DX-W2/W3/W5, DX-D2/D3) provide mechanical interlock plus electromagnetic guard locking, holding force up to 1300 N, EN ISO 14119, IP67. These are the companion guard switch that feeds a DA31 relay — the equivalent of Telemecanique's XCS family (XCSDMR / XCSMP / XCSE), not a replacement for an XPS relay or a XUSL curtain.

The DLD-series LiDAR (DLD05A3-3N / DLD20A5-5N) is a 2D time-of-flight obstacle-avoidance scanner — 905 nm Class 1, 270° scan, 5 m or 20 m range, 15/30 Hz, ±30 mm accuracy, self-learning zones, IP65, NPN/PNP. It is published as an AGV/AMR navigation and area-awareness product, not a certified Type 3 (IEC 61496-3) functional-safety laser scanner. Schneider / Telemecanique has no safety laser scanner under the Preventa brand either, so there is no Preventa part for the DLD to replace. We footnote the DLD here as a complementary mobile-robot sensor and nothing more — do not position it as a Preventa safety-scanner substitute.

What to match before you swap any Preventa part for a DAIDISIKE one

For the relay it is six numbers; for the curtain it is the same plus the safety-distance re-check. This is the same discipline we apply to every brand cross-reference.

• Safety function — E-stop, safety gate, light-curtain (OSSD), or a controlled stop-category-1 with delayed outputs (XPS-AT/AV — a single DA31 does not cover this).
• Input channels — single or dual-channel with cross-fault monitoring (dual is required for higher PL/SIL).
• Output contacts & rating — NO enabling contacts, any NC signalling contact, and switching current. DA31 = 3NO+1NC; confirm you do not need a fourth NO vs the XPSAF.
• Control voltage — the DA31 is 24 V DC only; many XPS-AF/AC variants are 24/48 V AC. Verify this first.
• PL / SIL target & DIN width — from the risk assessment (DA31 is PL e / SIL 3, 22.5 mm).
• Curtain: resolution, protected height, range, connector — match the body part, the Hp, the reach, and the OSSD polarity / M12-vs-aviation connector.
• Curtain: ISO 13855 safety distance — re-run S = K·T + C with the DAIDISIKE response time; do not assume the XUSL geometry carries over.

Send those off your installed safety relay and light curtain and we will confirm the DA31 + DQ pairing fits, or tell you plainly that it doesn't — for instance, if you need a controller for an XPSMC, delayed outputs for an XPS-AT, or a specific XUSL4MB muting build. The wider method and the other brand cross-references (such as our Pilz PNOZ alternatives and Allen-Bradley Guardmaster alternatives) follow the same discipline, and the safety-distance math is worked through in our ISO 13855 safety-distance guide.

Is naming Schneider, Preventa and the XPS/XUSL part numbers legal?

Naming a competitor's product to describe a compatible alternative is nominative reference and is legitimate; we keep it honest by using only Schneider / Telemecanique published specs. We reference Schneider Electric, the Preventa brand and the XPS / XUSL / XCS model names to tell you what the DAIDISIKE equivalent is — normal, lawful comparison, with no implied partnership or endorsement. Note that Telemecanique is not a separate company here; it is Schneider's brand under which Preventa is sold. What we deliberately do not do: we do not reproduce Schneider manuals, we do not use their trademarks or logos as our own, we do not reuse Schneider order numbers (XPSAF5130, XUSL4E14F046N, etc.) on any DAIDISIKE part, and we do not invent matching certificate numbers or specs we cannot publish. Every DAIDISIKE figure here is from our own datasheet; PL e / SIL 3 on the curtains is reached as a complete safety function (curtain + relay/PLC), integrator-verified — not a fabricated per-part certificate.