Phoenix Contact PSR Safety Relay Alternatives — the DAIDISIKE DA31

We already keep cross-reference notes for the Pilz PNOZ and the Allen-Bradley Guardmaster 440R, because those are the names customers most often arrive with when they want a force-guided safety relay sourced direct from the factory. Phoenix Contact's PSR line is the next one that keeps coming up — so here it is, built the same honest way: from Phoenix Contact's own public catalogue, not from anyone's manual or marketing, and with the places it doesn't fit called out rather than buried.

Use the safety relay manufacturer and selection overview to assemble the required function, input and output data, restart strategy and supporting safety documents. For a PSR comparison, add the complete order number and the installed schematic. Mark any missing DA31 feedback or reset evidence as an unresolved requirement rather than assuming the same behaviour.

What is the DAIDISIKE alternative to the PSR-MC?

The PSR-MC34 is a model-specific comparison, not a 22.5 mm family match. Phoenix Contact lists PSR-MC34-3NO-1DO-24DC-SC (2700540) as a 12.5 mm PSRmini device with three enabling current paths, one PNP digital signalling output and specified monitored-start and cross-circuit detection functions. Other PSR-MC order numbers have different input/output arrangements; verify each suffix instead of grouping MC34, MC40 and MC50 as identical units.

DA31 published data lists 24 V DC, three N.O. safety contacts, one N.C. auxiliary contact and a separate transistor signalling output. This corrects the assumption that it offers only a hard-contact status interface. However, signal polarity, load, logic state and connection details still require its manual. DA31 external device monitoring and monitored-start equivalence are not established, so the PSR-MC34 function cannot be declared a direct fit.

Can a 22.6 mm DA31 replace a PSR-SCP relay?

Resolve the complete PSR-SCP order code before choosing a substitute. The ESP4, ESA4, ESAM4 and MXF2 designations refer to different devices. A common connector or family prefix does not prove equal input evaluation, contact expansion, delayed behaviour or restart logic. Preserve the installed function when comparing any proposed DA31 circuit.

If the original device evaluates an E-stop or guard, compare its supported input tests and reset/feedback functions with a documented DA31 design. If it is a coupling or expansion stage, retain the upstream evaluator, feedback relationship and output ratings; a standalone relay is not automatically an equivalent expansion module. The installed schematic is as important as the part number.

The obsolete-part hook: what replaced 2981114 and 2981127?

A legacy replacement must be confirmed per order number. For 2981114 or 2981127, obtain the current catalogue lifecycle status and the manufacturer-recommended successor, including any required wiring changes. A suggested PSRmini-family direction or a reference to PSRcompact MC32 2700524 does not establish a universal migration path for both devices.

DA31 may be considered alongside the manufacturer migration route only after the original function is known. Its 22.6 mm body, 24 V DC supply and contact arrangement are comparison fields, not proof that it preserves the legacy footprint or monitoring functions. Include mechanical changes and validation in the alternative-sourcing decision.

How does the DA31 cross-reference to each PSR family?

The table separates product roles and unresolved comparison points. Use exact order-number data, especially for width and restart functions; it is not a guaranteed cross-reference list.

Exact-order references: MS50 2904956 is 6.8 mm; MC32 2700524 is a 22.5 mm PSRcompact unit, not a 6/12 mm push-in PSRmini.

DA31 assessment follows the same evidence process used in the Guardmaster comparison: distinguish input evaluation, configurable logic and contact expansion, then verify every used function. The DA31 specification provides the candidate data; the applicable manual must resolve the remaining wiring and monitoring questions.

PSR-TRISAFE vs. a normal force-guided relay

PSR-TRISAFE configurable logic is outside a DA31 substitution. Preserve its program, independently evaluated inputs, output logic and diagnostics in a suitable safety controller design. A fixed-function relay is a candidate only when the complete required function is explicitly supported; even one machine may need configurable logic or multiple restart zones.

Pilz PNOZ vs PSR vs DA31 — where the DA31 sits

Compare the actual installed function before comparing sourcing channels. PNOZ and PSR are broad families. DA31 can enter a procurement shortlist when its documented capabilities satisfy the requirements, but a common PL/SIL label does not establish equivalence. Request current price, lead time and supporting documents, and include the engineering and commissioning cost of any change.

Is naming Phoenix Contact legal, and how do you keep this honest?

Phoenix Contact and PSR names identify the comparison targets, with no implied affiliation or endorsement. This is not legal advice or a compatibility declaration. Each competitor claim needs its own exact-model source, and DA31 capabilities require separate DAIDISIKE evidence. Missing data remains an open engineering question.

Send us the safety function (E-stop, gate, light curtain), the input channels, the contact count you need, your EDM/reset scheme and the PSR part number you are replacing, and we will confirm the DA31 fit — or tell you plainly when PSRmini width or PSR-TRISAFE logic is the better tool. Our wider sourcing and OEM detail lives on the safety relay manufacturer page.