DA31 Emergency-Stop Safety Relay Module
Ultra-slim 22.6 mm Category 4/PL e/SIL 3 safety relay with dual-channel PNP/NPN input and a solid-state status output.
▶ Watch it in action: Safety Light Curtain + Guard-Locking Door Switch Interlock — Wiring Demo
🔍 Click to enlarge · 1/10Technical Specifications
| Output Type | Relay 3NO+1NC forcibly guided contacts (13/14, 23/24, 33/34 safety N.O.; 41/42 auxiliary N.C.) + transistor signaling output <500mA/24VDC |
|---|---|
| Contact Rating | AC-1 6A/250VAC; max 12A |
| Safety Input | Dual-channel safety input (supports PNP or NPN) |
| Input Modes | 4-mode DIP switch: emergency stop / safety light curtain OSSD / safety door interlock / two-hand control |
| Safety Level | Cat.4 / PLe / SIL3 |
| Operating Voltage | DC 24V |
| Power Consumption | 2.9W |
| Response Time | <30ms |
| Dimensions | 112 × 99.5 × 22.6 mm (ultra-slim) |
| Operating Temperature | -25 ~ +85 °C |
Overview
DA31 is an emergency-stop safety relay module that monitors dual-channel safety inputs — e-stop pushbuttons, safety light curtain OSSD outputs, safety door interlock switches, or two-hand control devices — and switches forcibly guided safety contacts to cut power to hazardous machine functions when a safety input is triggered.
It is built for machine builders and panel builders who need a compact, standards-capable safety switching device, particularly where DIN-rail width inside the control cabinet is limited or where the safety circuit must also report status back to a PLC through a solid-state output. At 112 × 99.5 × 22.6 mm, its 22.6 mm width lets more safety relay modules occupy the same DIN-rail length in space-constrained cabinets.
Features & Benefits
Ultra-slim 22.6 mm housing
At 112 × 99.5 × 22.6 mm, DA31's 22.6 mm width lets more safety relay modules occupy the same DIN-rail length in cabinets where every millimeter of panel space matters.
Dual-channel input accepts both PNP and NPN
One part number reads either PNP (sourcing) or NPN (sinking) safety input signals, so it can interface with sensors and switches wired either style without needing separate SKUs.
Relay safety contacts plus a solid-state status output
In addition to the 3NO+1NC forcibly guided relay contacts, DA31 provides a separate transistor signaling output (< 500 mA / 24 VDC) that can report machine run/stop status to a PLC without using up a safety contact for that purpose.
Four selectable safety input modes via DIP switch
E-stop, safety light curtain OSSD, safety door interlock, and two-hand control modes are all selectable on one module, so one part can serve different safety-device interfaces as machine configuration requires.
Category 4 / PL e / SIL 3 capability with IEC-standard terminal designations
DA31 is rated to Category 4 / Performance Level e per EN ISO 13849-1 and SIL 3 per IEC 61508, with safety contacts labeled 13/14, 23/24, 33/34 and an auxiliary N.C. contact labeled 41/42, following standard IEC terminal numbering conventions for unambiguous wiring.
Wide operating temperature range, −25 °C to +85 °C
The +85 °C upper limit extends the module's usable range for enclosures mounted near heat-generating machinery.
Fast response, sub-30 ms
Response time under 30 ms lets the safety circuit interrupt hazardous motion quickly once a safety input is triggered.
6 A / 250 VAC contact rating, 12 A maximum total current
Safety contacts are rated AC-1 6 A / 250 VAC, with a maximum total current of 12 A across the module, sized for typical control-circuit and small-motor load switching.
Applications
Models & Ordering Information
DA31 Series
How to Select
- Select the DIP-switch input mode to match the safety device: emergency stop for e-stop pushbuttons, safety light curtain OSSD for OSSD-output light curtains, guard interlock for safety door switches, or two-hand control for two-hand operating stations — all four modes are available on the same DA31 module.
- DA31's dual-channel safety input accepts both PNP (sourcing) and NPN (sinking) signals, so no separate model is needed based on sensor wiring type.
- Check control-cabinet DIN-rail width: DA31's 22.6 mm width is the main reason to choose it over a standard-width safety relay when panel space is tight.
- If the machine needs to report run/stop status to a PLC without using a safety contact for that purpose, DA31's built-in <500 mA/24 VDC transistor signaling output can serve this role.
- Confirm the required safety performance level: DA31 is rated to Category 4 / PL e per EN ISO 13849-1 and SIL 3 per IEC 61508.
- Safety contacts are rated AC-1 6 A/250 VAC with a maximum total current of 12 A; for DC load switching, confirm the applicable contact rating with us before finalizing your design.
- Check ambient temperature: DA31 is rated for -25 °C to +85 °C operation.
- Power supply is DC 24V with 2.9 W consumption.
📘 Need the full method? How to Choose a Safety Door Switch / Interlock
When NOT to specify the DA31 — and what to use instead
Needing a device that itself senses a light-curtain beam break, e-stop pull, or door position
Why not: DA31 is a downstream relay/evaluation module — it monitors a dual-channel input signal already produced by a safety device; it does not sense anything on its own.
Use instead: Pair DA31 with a DAIDISIKE light curtain (DQC/DQA/DQT/DQT4), a DX safety door lock, or an e-stop pushbutton wired to its input
The panel needs one controller handling several independent safety functions/zones at once (e.g. multiple e-stop chains and light curtains evaluated separately in parallel)
Why not: DA31 is a single relay module with one dual-channel input and one DIP-switch-selected mode active at a time; it evaluates one safety function, not several simultaneously.
Use instead: Use one DA31 or DQSRN per safety function/zone
DIN-rail width is not constrained and a different terminal/contact layout suits the panel design better
Why not: DA31's main differentiator versus other modules in this catalog is its ultra-slim 22.6 mm housing; if panel space is not the limiting factor, the layout choice should be reviewed on its own merits.
Use instead: DQSRN safety relay module
The connected safety input device (sensor, switch, or light curtain) has its own PL or Category rating lower than Cat.4/PLe
Why not: DA31 is specified to achieve Cat.4/PLe/SIL3 on its own, but per EN ISO 13849-1 the achieved PL of the overall safety function is limited by the lowest-rated component in the chain, not by the relay alone.
Use instead: Verify the PL/Category of every component in the safety chain before assuming the system reaches Cat.4/PLe
Load current or voltage exceeds the relay's contact rating
Why not: Contacts are rated AC-1 6A/250VAC with 12A maximum total current; switching beyond this risks contact welding or failure.
Use instead: Add an interposing contactor sized for the load downstream of DA31's contacts
Specifications we do not publish yet
We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.
- Enclosure ingress protection (IP) rating
- Housing/enclosure material
- Certificate numbers and issuing body for the stated Cat.4/PLe/SIL3 rating
- PFHd/PFDavg and the MTTFd/B10d figures underlying the stated Cat.4/PLe/SIL3 rating
- DC-load contact rating shows conflicting figures across source catalogs (DC-13 4A/24VDC vs DC-1 6A/24VDC)
Frequently Asked Questions
What is the DA31 safety relay module used for?
Does DA31 support both PNP and NPN safety input wiring?
What safety performance level does DA31 achieve?
What is the response time of DA31?
How many output contacts does DA31 have?
What is the physical size of DA31?
What input modes can DA31 be configured for?
What is the rated contact capacity of DA31?
What power supply does DA31 require?
What is the operating temperature range of DA31?
Can you provide certification documents for DA31?
Works Well Together
On the same machine or line, DA31 is typically ordered together with: Safety Light Curtains · Safety Door Locks & Switches · Safety Mats
DCE Automation Safety Light Curtain
Compact through-beam safety light curtain in a 30 x 30 mm housing: 10/20/30/40 mm beam pitch, up to 72 beams, 0.3-3 m or 0.3-6 m sensing distance, NPN/PNP output. Designed to the Type 4 architecture of IEC 61496-1/-3 and Category 4 (PLd) of ISO 13849-1.
DX-C1 Magnetic Coded Safety Switch
Non-contact coded-magnet safety switch with 17 mm sensing range and high misalignment tolerance for guard doors.
JT14 Safety Mat (Economical)
Economical pressure-sensitive safety mat with volt-free N.O. output for large-area or custom-shape floor guarding.
