Schneider Electric XPSAC5121 — Specs, Status & Alternatives

By Abdullah Zahid
16 min read
Schneider Electric XPSAC5121 Preventa XPS safety relay module for 24V emergency stop circuit monitoring on 35mm DIN rail

Schneider Electric XPSAC5121 Safety Module — Specifications, Discontinued Status and Replacement Alternatives for Emergency Stop Circuits

If you are sourcing the Schneider Electric XPSAC5121 today, you are almost certainly replacing a failed module in an existing machine, building a spare parts inventory before a hard deadline, or trying to understand whether legacy sourcing still makes sense for your system. The XPSAC5121 is a 24V AC/DC emergency stop safety relay module in the Preventa XPS family, certified to PL e/Category 4 and SIL 3 — the highest performance tier recognized by the EU Machinery Directive and IEC 62061. It was discontinued on July 31, 2023, with end-of-service confirmed for December 31, 2025. That deadline is the single most important fact on this page, and everything in this article flows from it.

If you have already confirmed this is the right part for your installation, check current stock and availability for the XPSAC5121 at LeadTime.ca — we source and ship worldwide, including certified refurbished and new old stock for discontinued Schneider Electric parts.

Who Should Buy the XPSAC5121 — and Who Shouldn't

This module is the right choice for a specific, narrowing window of buyers. If you match the criteria below, sourcing now is the correct decision. If you do not, this article will tell you exactly which in-production alternatives to evaluate instead.

  • Your supply voltage is confirmed 24V AC or 24V DC — the XPSAC5121 has no 110V or 230V variants, and this cannot be adapted
  • Your control circuit requires volt-free relay contacts — 3 NO (normally open) configuration — not a powered signal output or fieldbus gateway
  • The machine or system already uses Preventa XPS architecture and you need a plug-compatible replacement without redesigning the safety circuit
  • Your installation is mounted on a 35mm symmetrical DIN rail with IP20 terminal / IP40 enclosure protection; this module does not fit asymmetrical or compact 18mm rails
  • Your procurement timeline allows sourcing and receipt before December 31, 2025, and your system's operational horizon is 2–3 years from that date
  • You can confirm with your supplier whether the unit is certified refurbished, new old stock, or third-party sourced — and accept only the first two

If your system is a new design, if you need active vendor support beyond 2025, or if your operating horizon extends well into the late 2020s, move directly to the variant comparison section — the Siemens 6ES7136-6BA00-0CA0 and Phoenix Contact PSR equivalents are in-production and carry 24-month warranties.

On this page:

What the XPSAC5121 Does in a Safety Circuit

The Schneider Electric XPSAC5121 is a standalone safety relay module that monitors emergency stop pushbuttons and safety-critical limit switches in industrial machinery. Its job is to act as a certified, galvanically isolated intermediary between the physical emergency stop button and the control system — the moment an e-stop is activated or a safety switch opens, the module interrupts the relay output circuit and forces the connected load into a safe state. It does this through three volt-free NO relay contacts plus one solid-state output, without sourcing any voltage of its own into the output circuit.

The volt-free relay architecture is the defining characteristic of this module. Because the relay contacts carry no potential of their own, the XPSAC5121 integrates with virtually any legacy hardwired control circuit or older PLC safety input module — the external circuit provides its own voltage, and the relay contacts simply switch it. This is why it remains sought-after in legacy system maintenance: no signal conditioning card is needed, no powered interface module is required, and it wires directly into the same architecture that was installed a decade ago.

Its safety certification credentials are equally straightforward. The XPSAC5121 achieves Performance Level e (PL e) per EN/ISO 13849-1 and Safety Integrity Level 3 (SIL 3) per IEC 62061, with a calculated Mean Time to Failure (MTTFd) of 210.4 years and diagnostic coverage exceeding 99%. For maintenance engineers replacing a failed module in a CE-marked machine, those numbers mean the replacement does not require re-certification of the safety function — the safety level is preserved. For procurement specialists, they mean this is not a generic relay; it is a type-tested safety component with documented compliance credentials.

Where the XPSAC5121 Sits in a Typical System

The XPSAC5121 occupies a defined position in the safety signal chain — between the physical actuator (e-stop button or limit switch) and the control system input that initiates a shutdown response. Understanding its position helps confirm whether this is the correct component for your cabinet or whether your architecture calls for something upstream or downstream of it.

  • 24V AC or DC power supply feeds the module from the panel's safety supply rail
  • Emergency stop pushbutton or safety-rated limit switch connects to the module's monitoring input terminals
  • The XPSAC5121 monitors the input circuit continuously; when the circuit opens (e-stop pressed or limit switch triggered), relay contacts open within the module's response time
  • The 3 NO volt-free relay contacts connect downstream to the PLC safety input module, contactor coil, or hardwired control circuit that de-energizes the hazardous drive or actuator
  • The additional solid-state output can be routed to a secondary monitoring input or status indicator, depending on the control system architecture

Industries and Applications That Still Use This Module

The XPSAC5121's remaining active buyer base is concentrated in facilities that made significant capital investments in Preventa XPS-based safety systems between 2005 and 2020. In heavy manufacturing — injection molding, metalworking presses, and textile looms — the module appears in cabinet-level emergency stop circuits where the PLC safety input is a legacy hardwired type that expects dry contacts rather than digital signals. Replacement sourcing for these machines is driven by field service events: a failed relay contact, physical damage to the terminal strip, or routine safety circuit recertification that requires a documented, type-tested replacement.

In process automation — food and beverage lines, pharmaceutical manufacturing, and chemical processing — the SIL 3 certification is the specific reason the XPSAC5121 was specified originally and remains the reason buyers will not substitute a lower-rated relay without a full safety lifecycle review. Engineers in these industries confirm the safety function against IEC 62061 requirements; a replacement part must carry the same SIL level to avoid triggering a formal change management process.

Conveyor and material handling systems represent a third active use case, where the XPSAC5121 monitors safety gate switches or presence sensors along a conveyor run. In this role, the module's IP40 enclosure and -10°C to +55°C operating range suit typical factory floor environments. OEMs and system integrators who maintain service contracts on conveyor installations make up a meaningful share of current sourcing demand — they stock replacement units to meet contractual uptime commitments regardless of the module's end-of-life status.

Application Typical Deployment
CNC Machine / Industrial Press E-stop circuit monitoring with relay output to legacy PLC safety input; galvanic isolation required
Conveyor and Material Handling Safety gate switch or presence sensor monitoring; relay contacts drive contactor coil shutdown
Pharmaceutical / Food Processing Line SIL 3 e-stop monitoring per IEC 62061; replacement of like-for-like to preserve safety function without re-certification
Industrial Robot Cell Perimeter guard switch monitoring; 3 NO contacts wired in series for redundant shutdown path
OEM Machine Service Contract Spare parts sourcing for installed base; pre-purchasing inventory before December 31, 2025 end-of-service

Specifications That Matter for Your Purchase Decision

Parameter Specification
Supply Voltage 24V AC (±20%) or 24V DC (±20%) — no other voltage variants
Safety Level PL e / Category 4 per EN/ISO 13849-1; SIL 3 per IEC 62061
Relay Outputs 3 NO (normally open) volt-free relay circuits
Additional Output 1 solid-state output
Contact Voltage Rating 300V AC/DC (volt-free)
Breaking Capacity 180 VA AC-15 C300 (holding); 1800 VA AC-15 (inrush)
Power Consumption 1.2W (DC); 2.5 VA (AC)
Operating Temperature -10°C to +55°C
Ingress Protection IP20 (terminals); IP40 (enclosure)
Mounting / Weight 35mm symmetrical DIN rail; 0.16 kg

Full technical specifications are available on the product page at LeadTime.ca.

XPSAC5121 vs In-Production Alternatives: Which One Do You Actually Need?

The comparison below is structured around the decision engineers actually face: source the XPSAC5121 now from legacy inventory, or specify an in-production alternative and absorb the integration change. Each column represents a real option with different trade-offs on safety level, supply voltage flexibility, production status, and sourcing risk.

Criteria Schneider Electric XPSAC5121 Siemens 6ES7136-6BA00-0CA0 Phoenix Contact PSR
Safety Level PL e / SIL 3 PL e / SIL 3 PL e / SIL 3
Supply Voltage 24V AC/DC only 24V DC, 110V AC 24V AC/DC, 110V AC
Output Type Volt-free relay, solid-state Relay, signal conditioning Relay, signal conditioning
Production Status Discontinued — end-of-service Dec 31, 2025 In production In production
Mounting 35mm DIN rail Modular rail 35mm DIN rail
Power Consumption 1.2W DC / 2.5 VA AC 2.5W 3.5W
Warranty 18 months (limited for legacy stock) 24 months 24 months
MTTFd 210.4 years Not listed in brief Not listed in brief
Best For Legacy system replacement; existing Preventa XPS architecture New installations; modular architecture; multi-voltage sites Industrial machinery retrofit; 35mm rail compatibility
Key Drawback End-of-life sourcing risk after Dec 31, 2025 Higher cost; different mounting architecture Learning curve for new users; higher power draw

If your system design begins in 2025 or your operational horizon extends past the end-of-service date, the Siemens 6ES7136-6BA00-0CA0 or Phoenix Contact PSR equivalent offers active production support, a 24-month warranty, and broader voltage flexibility. Check current availability and compare options at LeadTime.ca — our team can confirm which in-production alternative maps most directly to your existing circuit topology.

Expert Verdict: Is the XPSAC5121 Still Worth Sourcing?

The XPSAC5121 is a well-proven safety relay with credentials that are difficult to argue with: PL e/Category 4, SIL 3, an MTTFd of 210.4 years, and diagnostic coverage exceeding 99%. For a maintenance engineer replacing a failed unit in a machine that already uses Preventa XPS architecture, this module remains a sound, like-for-like replacement — provided the unit is sourced from a verified channel and the machine's operational horizon does not extend significantly beyond 2025. The volt-free relay output, 35mm DIN rail form factor, and 24V AC/DC supply compatibility mean the swap is direct, with no rewiring of the safety circuit and no change to the certified safety function. That matters enormously when you are dealing with a live production asset and a re-certification event would trigger weeks of downtime.

Where the calculus changes is for new system designs and any installation expected to run into the late 2020s. Schneider discontinued this module in mid-2023 for a reason — the industry has moved toward modular, integrated safety controller architectures that offer better diagnostic interfaces, broader voltage flexibility, and vendor roadmaps that extend beyond the next service contract. The Siemens 6ES7136-6BA00-0CA0 delivers the same PL e/SIL 3 safety level with active production support and a 24-month warranty. The Phoenix Contact PSR series matches on DIN rail format and safety level while accepting both 24V AC/DC and 110V AC — an advantage on multi-voltage sites. If your project timeline or machine lifecycle takes you past the December 31, 2025 end-of-service date, specifying either of those alternatives now is the more defensible engineering decision.

The procurement reality for the XPSAC5121 in 2025 is this: inventory exists, but it is finite, volatile in price, and unevenly distributed between certified refurbished stock and gray-market units of uncertain provenance. The difference between those two categories is not academic — it determines whether the unit carries any warranty coverage and whether you can document the batch code for your safety file. A specialist industrial distributor adds genuine value at this stage of a product's lifecycle: verified sourcing channel, batch date confirmation, and the ability to tell you honestly whether legacy sourcing or migration to an in-production alternative is the better decision for your specific application. View current XPSAC5121 stock status and sourcing options at LeadTime.ca — we ship worldwide and maintain supplier relationships specifically for discontinued industrial automation components.

For volume pricing, confirmed lead times before committing to a build schedule, or a sourcing recommendation on in-production alternatives, contact the LeadTime.ca team directly — we ship worldwide and respond to technical sourcing inquiries quickly.

What Engineers Need to Know Before Ordering the XPSAC5121

Community discussion specifically about the XPSAC5121 is sparse — this module's relatively narrow application scope, combined with its discontinued status, means it does not generate the volume of forum traffic that higher-volume PLCs or drive products attract. What that means in practice is that when engineers encounter a problem specifying or installing this module, they are unlikely to find a forum thread that resolves it in ten minutes. The questions get escalated directly to distributors or Schneider technical support — and after December 31, 2025, the manufacturer support channel closes.

Based on the technical characteristics of the XPSAC5121 and the profile of engineers sourcing it, three categories of pre-order clarification come up consistently. The first is output type confirmation. The XPSAC5121's relay contacts are volt-free — they carry no potential of their own. Engineers who have worked primarily with PLC digital outputs, which source 24V, sometimes wire the relay contacts as if they will produce a 24V signal. They do not. The external circuit must provide its own voltage; the relay contacts simply complete or break that circuit. Misunderstanding this point results in an e-stop monitoring function that appears wired correctly but fails silently. The second recurring issue is supply voltage specificity. The module accepts 24V AC or 24V DC — nothing else. No 110V variant exists, no adapter is available, and there is no tolerance above the stated ±20% band. The third issue, which is unique to discontinued products, is stock provenance. Engineers ordering the XPSAC5121 through secondary or gray-market channels sometimes receive units without batch date codes, without refurbishment documentation, or with physical evidence of prior installation and inadequate inspection. For a safety-critical component that must be documented in a machine's safety file, that is not an acceptable risk.

LeadTime.ca specializes in exactly this category of sourcing problem. When manufacturer channels close and community knowledge is thin, the value of a distributor who can confirm stock origin, provide batch documentation, and advise honestly on whether migration to an in-production alternative is the better path is not a marketing claim — it is a practical necessity. If you are uncertain whether the XPSAC5121 you have been quoted is the right component for your application and your timeline, reach out to the LeadTime.ca team before placing the order.

Wiring and Installation Overview

The following overview covers the key requirements for installing the XPSAC5121. For full wiring diagrams, terminal pinout, and commissioning procedures, refer to the Schneider Electric Preventa XPS XPSAC5121 installation datasheet directly.

  • Supply voltage must be confirmed at 24V AC or 24V DC within ±20% tolerance before connection; measure under full panel load, not just at the supply output, to verify the voltage does not sag below 19.2V
  • The emergency stop button or safety limit switch must be wired to the module's monitoring input terminals in normally closed (NC) configuration — an open circuit at the input triggers the safe state; confirm button contact type before wiring
  • The 3 NO volt-free relay contacts (rated 300V AC/DC, 180 VA holding / 1800 VA inrush) should be wired in series for redundant shutdown paths; the external circuit provides its own load voltage — the module does not source voltage through the relay contacts
  • Mount on 35mm symmetrical DIN rail with a minimum of 10mm clearance on both sides for thermal dissipation and terminal access; the module weighs 0.16 kg and requires no additional rail support under normal conditions
  • Input and output wiring should be routed in separate conduits where possible; if shared conduit is unavoidable, use shielded cable with shield terminated at cabinet frame ground at a single point only

Wrong-Part Prevention Checklist

Before placing an order for the XPSAC5121, verify each of the following against your application requirements and current project timeline. This checklist is drawn directly from the technical constraints of this module and the most common ordering errors associated with it.

  1. Confirm supply voltage is 24V AC or DC; XPSAC5121 has no 110V or 230V variants
  2. Verify you need volt-free relay output, not solid-state or Profibus/EtherCAT gateway
  3. Check that 3 NO (normally open) circuit configuration matches your e-stop architecture — not 3 NC or mixed
  4. Confirm DIN rail mounting space is 35mm symmetrical rail; does not fit asymmetrical or compact 18mm rails
  5. Ensure end-of-service date (Dec 31, 2025) does not conflict with your system lifecycle — if past, verify distributor has certified refurbished stock
  6. Do not confuse with XPSAE or XPSAM modules (different input types); XPSAC specifically monitors 24V AC/DC e-stop signals
  7. Verify operating temperature range -10°C to +55°C fits your installation environment

If any item on this checklist raises a question about fit, contact the LeadTime.ca team before ordering — we can confirm compatibility, check current certified stock status, and advise on in-production alternatives if the XPSAC5121 is not the correct specification for your application.

Frequently Asked Questions

What does the end-of-service date of December 31, 2025 actually mean for machines already running the XPSAC5121?

Machines currently operating with the XPSAC5121 installed can continue to run after December 31, 2025 — the end-of-service date does not make the module illegal to operate or automatically non-compliant. What it means is that after that date, Schneider Electric will no longer provide technical support, spare parts through official channels, or warranty coverage. For plant managers, the practical implication is that any replacement unit needed after December 2025 must come from secondary market inventory, which carries higher sourcing risk and no manufacturer warranty. Building a spare inventory before the deadline is the standard recommended approach for critical assets.

Can I use the XPSAC5121 to replace an XPSAE or XPSAM module in the same cabinet?

No — these are not interchangeable. The XPSAC model designation specifically indicates a module designed to monitor 24V AC/DC emergency stop signals. The XPSAE and XPSAM variants handle different input types and circuit configurations. Substituting one for the other without verifying the input monitoring architecture will result in either a non-functional safety circuit or a circuit that does not meet the certified safety level. Always confirm the full catalog number of the module being replaced, not just the XPSA prefix.

The XPSAC5121 I've been quoted is described as certified refurbished — what does that mean and is it acceptable for a safety application?

Certified refurbished, in the context of Schneider Electric products, means the unit has been repaired and tested through a Schneider-authorized refurbishment process and carries a defined warranty period. This is a different category from gray-market or third-party refurbished units, which may or may not have undergone any testing and carry no manufacturer-backed warranty. For a safety-critical module that must be documented in a machine safety file, certified refurbished with a batch date code and test certificate is acceptable — third-party refurbished without documentation is not. Ask your distributor explicitly which category the unit falls into before confirming the purchase order.

Does the XPSAC5121's PL e/SIL 3 certification transfer automatically to my machine's safety assessment if I use it as a replacement?

A like-for-like replacement of the same catalog number (XPSAC5121 for XPSAC5121) in the same circuit topology generally does not require a full re-certification of the safety function, because the replacement component carries the same safety level and certified performance. However, the specific requirement depends on your country's regulatory framework, your machine's CE technical file, and whether any other changes were made to the circuit at the same time. Your safety assessor or notified body makes the final determination — the module's PL e/Category 4 and SIL 3 documentation supports the case, but does not substitute for that assessment.

What is the maximum inrush current on startup and how do I size the 24V supply correctly?

The XPSAC5121 draws a maximum inrush current of 90 mA at 24V AC on power-up. Power consumption in steady state is 1.2W at DC and 2.5 VA at AC. When sizing a 24V supply, sum the inrush current of all modules and loads on the same rail and select a supply rated for at least 1.5 times that total. If the supply voltage sags below 19.2V (24V minus 20%) under full load, the module may enter a brownout state that causes relay contact chatter or false e-stop events. Measure supply voltage under full panel load before commissioning.

Why Order from LeadTime.ca

  • LeadTime.ca sources and ships industrial automation components worldwide, including discontinued and hard-to-find Schneider Electric Preventa XPS parts
  • For end-of-life products like the XPSAC5121, we confirm stock provenance — certified refurbished versus new old stock — before quoting, so you know exactly what you are receiving
  • Volume pricing and pre-purchasing arrangements are available for maintenance teams building spare inventory ahead of the December 31, 2025 end-of-service deadline
  • Our team can advise on in-production alternatives (Siemens 6ES7136-6BA00-0CA0, Phoenix Contact PSR) when legacy sourcing is not viable for your timeline or application

At-a-Glance Summary

  • The Schneider Electric XPSAC5121 is a 24V AC/DC emergency stop safety relay module in the Preventa XPS family with 3 NO volt-free relay outputs and 1 solid-state output
  • Certified to PL e/Category 4 per EN/ISO 13849-1 and SIL 3 per IEC 62061 — the highest tier for functional safety in the EU Machinery Directive context
  • MTTFd of 210.4 years with diagnostic coverage exceeding 99%, calculated per EN/ISO 13849-1
  • Relay contacts rated 300V AC/DC (volt-free), 180 VA holding / 1800 VA inrush; power consumption 1.2W DC / 2.5 VA AC
  • Mounts on 35mm symmetrical DIN rail; weighs 0.16 kg; operating temperature -10°C to +55°C; IP20 terminals / IP40 enclosure
  • Discontinued July 31, 2023; end-of-service December 31, 2025 — no Schneider replacement model announced
  • Sourcing options in 2025: certified refurbished (with batch documentation), new old stock — gray-market units without provenance documentation are not appropriate for safety file inclusion
  • In-production alternatives for new designs: Siemens 6ES7136-6BA00-0CA0 (PL e/SIL 3, 24-month warranty) and Phoenix Contact PSR (PL e/SIL 3, 35mm DIN rail, broader voltage range)
  • 18-month warranty on legacy stock — confirm warranty terms in writing at time of purchase

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