DQSRN Multi-Input Safety Relay Module
Four safety input types, one part number: set the DIP switches and the same DIN-rail relay supervises an E-stop, a light curtain, a guard door or a two-hand station.
- DIP-selectable inputs: E-stop / OSSD / door interlock / two-hand
- 3 N.O. + 1 N.C. forcibly guided contacts, AgSnO2 + gold plating
- Response under 30 ms from trigger to contact opening
- EN ISO 13849-1 Cat. 4 / PL e functional-safety design reference
- DC 24 V, 2.9 W, 45 mm standard DIN housing
One Relay Where Panels Used to Need Four
Most machine panels accumulate safety relays the same way: one model for the E-stop chain, another to expand a light curtain's OSSD pair, a third for the guard door, sometimes a fourth for a two-hand station. Each is a separate line on the BOM, a separate spare on the shelf, and a separate chance to fit the wrong one. The DQSRN collapses that list: a DIP switch on the module selects which of the four input classes it monitors, and the rest of the wiring stays conventional.
Downstream, the module behaves like a classic force-guided safety relay. Two internal channels cross-check the selected input, and the output stage — three N.O. safety contacts plus one N.C. auxiliary — opens in under 30 ms. Contact metallurgy is AgSnO2 with 0.2 µm gold plating, so the same set that switches a 240 VAC contactor coil (AC-15 4 A) also holds up a 10 mA / 5 V PLC status signal without film buildup.
Two monitoring variants exist — one for transistor/OSSD signals, one for volt-free N.C. switches — plus the DQSRP dedicated two-hand version. It is also the catalog-listed controller for DAIDISIKE's DQSA passive curtains and JT14 safety mats. For ultra-slim panels, see the 22.6 mm DA31 safety relay module and the DA31-B instead.
Typical Wiring Concept
On-Module Function Selection
The side label carries the internal circuit and the DIP-switch table — set the mode with the machine confirmed safe, then re-verify the safety function after any change.
Technical Specifications
| Input modes | 4, DIP-switch selectable: E-stop button / light curtain OSSD (single or dual-channel PNP) / safety door interlock / two-hand control device |
|---|---|
| Functional safety | EN ISO 13849-1 Category 4 / PL e — functional-safety design reference; IEC 61508 SIL 3 — functional-safety technical reference |
| Output contacts | 3 N.O. safety + 1 N.C. auxiliary, forcibly guided (positively driven) |
| Contact material | AgSnO2 with 0.2 µm gold plating |
| Contact ratings | AC-1 6 A / 250 VAC; AC-15 4 A / 240 VAC; DC-1 6 A / 24 VDC; 12 A max |
| Minimum load | 10 mA / 5 V |
| Response time | < 30 ms, input trigger to contact opening |
| Supply | DC 24 V, +10 % / −20 %, approx. 2.9 W |
| Housing / mounting | 45 mm wide, standard DIN rail, IP30 |
| Variants | Transistor/OSSD monitoring; N.C.-switch monitoring; DQSRP (dedicated two-hand). Confirm the exact variant code with the factory when ordering. |
Operating temperature range and certificate details are confirmed with the factory for the shipped hardware revision — certification documents are available on request.
Typical Applications
Press & Press Brake Safety Chains
Monitors E-stop buttons or two-hand stations on punch presses, hydraulic presses and press brakes, opening the drive contactors within 30 ms.
Contact Multiplication for OSSD Curtains
Turns a light curtain's two transistor OSSD channels into three forcibly guided N.O. contacts able to drive contactors and valves a transistor output cannot.
Guard-Door Interlocking
Supervises N.C. door-interlock switches on machine tools and automated lines, with the N.C. auxiliary contact reporting status to the PLC.
Passive Device Integration
Catalog-listed controller for DQSA passive light curtains, and the documented companion relay for JT14 safety mats (passive dry-contact devices).
Frequently Asked Questions
How does one DQSRN replace four different dedicated safety relays?
A bank of DIP switches on the module selects which input class it supervises: E-stop pushbutton, safety light curtain OSSD (single- or dual-channel PNP), safety door interlock switch, or a two-hand control device. Panel builders therefore stock a single part number and set the mode at commissioning, instead of holding a separate relay type for each safety device on the machine.
What do the output contacts offer, and why does forcibly guided design matter?
The output stage carries three normally-open safety contacts plus one normally-closed auxiliary contact. The mechanically linked (forcibly guided) construction guarantees N.O. and N.C. contacts can never be closed together, so if a safety contact ever welds shut, the auxiliary contact reveals it — which is what makes external device monitoring (EDM) chains trustworthy.
Can the same contacts switch both contactor coils and PLC signal inputs?
Yes — that is the point of the AgSnO2 contact material with 0.2 µm gold plating. The rated loads run from AC-1 6 A/250 VAC, AC-15 4 A/240 VAC and DC-1 6 A/24 VDC (12 A maximum) all the way down to a reliable 10 mA at 5 V minimum load, so a low-level PLC status input on the N.C. contact will not suffer from contact-film dropout.
What safety level does the DQSRN target?
The module is designed with EN ISO 13849-1 Category 4 / Performance Level e as its functional-safety design reference and IEC 61508 SIL 3 as its functional-safety technical reference. Remember that the achieved PL of a complete safety function depends on every device in the chain — sensor, logic and actuators — not on the relay alone. Certification documents are available on request.
DQSRN or DA31 — which should I order?
Choose DQSRN when you want one module that can be switched between E-stop, OSSD, door-interlock and two-hand inputs, in a standard 45 mm DIN housing. Choose the DA31 safety relay module when panel width is critical (22.6 mm ultra-slim) or you prefer a dedicated single-purpose e-stop relay. For a two-hand-only station with no mode switching, the sibling DQSRP is the dedicated variant.
How is DQSRN wired to a light curtain with PNP OSSD outputs?
Set the DIP switches to the OSSD mode, land OSSD1 and OSSD2 on the two monitored input channels, and wire the start/reset circuit per the manual. The module checks both channels for simultaneity and shorts, then closes the three N.O. contacts; response from input trigger to contact opening is under 30 ms, which feeds directly into your ISO 13855 minimum-distance calculation.
What are the MOQ, OEM options and lead time for export orders?
Small trial quantities are accepted — export customers typically start with a sample batch for panel validation. OEM labelling and carton customization are available for volume orders. Lead times vary with quantity and variant (OSSD-monitoring vs N.C.-switch monitoring), so ask for a current schedule with your enquiry.